AHR Expo 2025: Innovation, Insights, and Industry Connections in Orlando

Last week, we had the incredible opportunity to attend the AHR Expo 2025 in Orlando, Florida—one of the HVACR industry’s most significant annual gatherings. This event brought together manufacturers, engineers, contractors, distributors, and industry leaders from around the world to showcase the latest innovations, discuss key industry trends, and forge valuable business connections.

Held at the Orange County Convention Center, the expo was a sprawling hub of cutting-edge technology, networking opportunities, and insightful education sessions. From the moment we stepped onto the showroom floor, it was clear that this year’s event was set to be one of the most dynamic yet. The energy was electric, with thousands of attendees exploring booths from more than 1,600 exhibitors, each showcasing groundbreaking products and solutions aimed at driving the HVACR industry forward.

One of the key highlights was seeing firsthand how the industry is embracing sustainability and energy efficiency. With increasing demand for environmentally friendly solutions, many exhibitors unveiled high-efficiency HVAC systems, advanced building automation technologies, and new refrigerants designed to meet evolving regulations. Smart building solutions were a major theme, with numerous companies demonstrating how IoT and AI-driven systems are enhancing climate control, optimizing energy usage, and improving system diagnostics.

Our team took full advantage of the opportunity to connect with both new and existing partners. The expo provided an ideal setting to strengthen relationships with suppliers, discover new technologies, and gain insights into emerging trends that will shape the industry in the coming years. We were particularly impressed with innovations in smart zoning solutions, advancements in heat pump technology, and improvements in indoor air quality (IAQ) management—all of which are critical to the future of HVACR.

Beyond the exhibitor floor, the AHR Expo also featured a robust lineup of educational sessions, keynote speakers, and industry panels. We attended several thought-provoking discussions on topics ranging from decarbonization efforts to the future of smart HVAC systems. The conversations around workforce development and the role of technology in addressing labor shortages were particularly insightful, reinforcing the need for continued investment in training and upskilling.

Of course, an event like this isn’t just about business—it’s also about community. Whether it was reconnecting with long-time colleagues, engaging in lively discussions at networking events, or simply sharing a coffee with fellow industry professionals, the AHR Expo reminded us of the passion and innovation that drive this industry forward.

As we wrap up our time in Orlando and reflect on everything we experienced, one thing is clear: the future of HVACR is bright. The technologies we saw, the discussions we participated in, and the connections we made will all play a crucial role in shaping our strategy for the coming year. We left the expo feeling inspired, informed, and excited for what’s ahead.

Bypass dampers are STUPID... or maybe not?

Should a zoning system have a bypass damper or not?

Zone control systems have become a vital aspect of modern HVAC systems, especially in multi-room homes or commercial spaces where temperature preferences can vary significantly between areas. By allowing different parts of a building to be heated or cooled independently, zone control systems offer energy efficiency, increased comfort, and better overall control. However, one aspect of zone control systems—bypass dampers—has been a point of debate within the HVAC industry. Some argue that bypass dampers are unnecessary or even counterproductive, while others highlight their benefits in specific scenarios. This article explores the case for using bypass in zone control systems, delving into the advantages, discussing counterarguments, and examining studies that underline its effectiveness.

What is a Bypass Damper?

A bypass damper is a component within a zone control system that regulates excess air pressure. In a zoned system, individual zones can close when their set temperatures are reached, creating excess air pressure in the ductwork as the HVAC system continues to operate for the remaining open zones. A bypass damper redirects this excess air back into the system’s return duct or to a common area, balancing the airflow, and relieving pressure within the ducts. This feature is particularly relevant in systems with variable or multiple zones, where sudden or partial closures can create imbalances.

Benefits of Using Bypass in a Zone Control System

1. Pressure Relief and Ductwork Protection

   One of the primary advantages of using a bypass damper in zone control systems is pressure relief. When individual zones close, pressure can build up in the system. If left unmanaged, this excess pressure can strain ductwork, potentially leading to leaks or damage over time. A study by the Building Science Corporation noted that excessive air pressure in HVAC systems can lead to duct leakage, which in turn reduces the system’s efficiency and increases the chances of indoor air quality issues like pollutant infiltration (Rudd, 2017).

   Bypass dampers address this issue by redirecting the excess airflow, maintaining a balanced pressure across the system. This can extend the lifespan of the ductwork and help prevent common issues related to over-pressurization, such as loud or “whistling” noises, which can be disruptive to homeowners.

2. Improved System Efficiency

   Efficient airflow management is crucial for maintaining an HVAC system's performance. According to a study published in ASHRAE Journal, bypass dampers help to reduce the system's energy use by maintaining the HVAC system’s optimal airflow rate, which prevents overworking the blower (Griffiths & Simmons, 2019). By keeping the blower from operating against high resistance, a bypass damper can reduce wear on the blower motor and help maintain efficiency over time.

   In addition, bypass dampers can help ensure consistent airflow across the evaporator coil in cooling systems. If airflow drops too low due to zone closures, the coil can get too cold, increasing the risk of freezing and reducing the system's efficiency. By allowing excess airflow to bypass closed zones, the damper helps maintain steady airflow, optimizing the cooling performance.

3. Enhanced Comfort and Flexibility

   Zoning systems are installed with the primary goal of providing individual comfort to multiple areas. When bypass is integrated, the system can function more flexibly, balancing between zones and maintaining airflow to areas that might otherwise experience drafts or pressure differentials. For example, in situations where two out of three zones close, a bypass damper ensures that excess airflow does not flood into the single open zone, preventing discomfort from excessive air supply.

   This capability is especially beneficial in homes with varying occupancy, where different rooms might frequently be turned on and off. By integrating bypass, contractors can offer homeowners smoother transitions and fewer temperature fluctuations, even as zones close and open at different times of the day.

Addressing Common Arguments Against Bypass Use

Despite these advantages, bypass dampers have their critics within the HVAC industry. Here are some of the main counterarguments, and how proponents of bypass dampers respond.

1. "Bypass Dampers Waste Energy"

   A common argument against bypass dampers is that redirecting air back into the return duct wastes conditioned air, making the HVAC system less efficient. Critics argue that the energy used to heat or cool the bypassed air is lost as it re-enters the system.

   While it’s true that bypass dampers cycle some conditioned air, studies show that the amount of energy “wasted” is relatively small and often outweighed by the system's overall efficiency improvements. For example, research by the Energy Efficiency Collaborative found that systems with bypass dampers maintained consistent blower operation and achieved slightly higher efficiency overall, due to reduced blower strain and optimal airflow (Johnson et al., 2020). Furthermore, bypass dampers are typically adjustable, allowing HVAC contractors to set the damper to open only when necessary, thus minimizing any potential loss of conditioned air.

2. "Bypass Dampers Can Cause Humidity Issues"

   Some HVAC professionals argue that bypassing air back into the return duct can increase humidity levels, particularly in cooling mode, by recirculating moist air. This effect can be especially pronounced in high-humidity environments, where any recirculated air could carry excess moisture.

   However, this issue is usually manageable. Properly designed systems with adjustable bypass dampers, paired with regular HVAC maintenance, can minimize the impact on humidity. By integrating a humidistat or smart HVAC controls, contractors can mitigate any potential increase in indoor humidity levels. Additionally, in well-designed systems, bypass usage is often infrequent enough that humidity concerns are minimal.

3. "Variable-Speed Blowers Make Bypass Obsolete"

   Another argument suggests that bypass dampers are unnecessary for modern HVAC systems equipped with variable-speed blowers. These blowers can adjust to varying airflow needs as zones open and close, reducing the need for bypass.

   While variable-speed systems offer flexibility, they don’t always eliminate the need for bypass. For instance, in multi-zone systems with high zoning variation, even variable-speed blowers may struggle to maintain optimal airflow without bypass assistance. Furthermore, bypass dampers can help in retrofit applications where variable-speed technology may not be feasible or cost-effective for the homeowner. In such cases, bypass dampers serve as a practical and economical solution for maintaining comfort and performance in zone control systems.

Recommendations for Contractors

For HVAC contractors, the decision to install a bypass damper should take into account the specifics of the system design and the client’s needs. Here are some guidelines to consider:

• Evaluate System Size and Zone Variation: In systems with a large number of zones or zones of significantly varying sizes, a bypass damper can help maintain balance and prevent pressure issues. For smaller systems or those with variable-speed blowers, bypass may be less critical but still worth considering in certain cases.

• Adjust Bypass Settings: Setting up the bypass damper correctly is essential. Adjust the damper to open only when necessary, preventing excessive recirculation of conditioned air while maintaining system balance.

• Consider Customer Comfort Preferences: Homeowners often prioritize comfort, and bypass dampers can make zoning systems more comfortable by reducing noise and drafts. When pitching the benefits of bypass to clients, highlight the potential for improved comfort and airflow balance.

• Plan for Maintenance and Education: Educate clients on the maintenance needs of their zone control system, particularly when bypass is involved. Regular HVAC check-ups will help maintain balance and efficiency, even as seasons change and different zones are utilized.

Conclusion

For many HVAC applications, bypass dampers serve as a valuable component within zone control systems, providing pressure relief, protecting ductwork, and enhancing both comfort and energy efficiency. While modern HVAC systems with variable-speed blowers can manage airflow more effectively than their single-speed counterparts, bypass dampers offer an additional layer of balance that can be particularly useful in multi-zone configurations or retrofit applications.

By considering the system’s specifics and the customer’s comfort preferences, contractors can make an informed choice on when bypass dampers are appropriate. Ultimately, when used strategically, bypass dampers can enhance the performance, longevity, and user satisfaction of zoned HVAC systems, making them a worthwhile consideration for many installations.

References:

• Rudd, A. (2017). Building Science Corporation: Research Report—HVAC Duct System Leakage. Building Science Corporation.

• Griffiths, M., & Simmons, T. (2019). Effect of Bypass Dampers on HVAC Efficiency and Performance. ASHRAE Journal, 61(3), 45-51.

• Johnson, P., Liu, C., & Ames, E. (2020). Energy Efficiency Collaborative Study: HVAC Zoning and Efficiency. Energy Efficiency Collaborative.

SmartStatic - Automatic Pressure Relief

from $89.99

Barometric Bypass Damper

from $119.99

Modulating Bypass Damper Kit

from $169.99

NEW Product: Stand Alone Damper Control using ANY Thermostat

Sometimes, full blown zone controls are not needed to solve an airflow or temperature related issue in the ducting of a home or other building.

One example might be a bonus room, a basement or a 3 season room that could benefit from some air occasionally but doesn’t necessitate a zone control system with all of the features included with our SmartZone products.

For these applications, we have developed a control board that can connect a thermostat directly to a damper for basic control.

With this Damper Direct Controller, you can simply connect any thermostat, a 24vac transformer & hook up your damper (ANY damper will work as long as it is 24V).

The applications for this product are too may to list but, for us, it is just one additional tool in the toolbox for managing comfort and efficiency of your home or building’s HVAC. Contact ecojay.com or us here at ZoningSupply if you have any questions or ideas.

Sale

Direct Damper Controller

Sale Price: $39.99 Original Price: $49.99

ADD-A-WIRE with Zone Control

An ADD-A-WIRE device can be used when upgrading to thermostats that need a "COMMON" wire from one that didn't have one... and there is no way to run the additional wire needed.  This device, ranging from $15 to $40 can come in very handy especially in the case of zone control where one or more thermostat does not have enough wires to accomodate a modern thermostat such as a WiFi thermostat.

View fullsize

Be sure to follow the wiring diagram for the specific model of "ADD-A-WIRE" as well as the system type.  Show here is the LUX Products LPB-WH Power Bridge wired to a GAS/ELECTRIC thermostat and SmartZone-4X controller, however, the basic principal is the same for any application.

All of the different ADD-A-WIRE models come with instructions, read them carefully and follow exactly and you won't have any problems.

For more information about the method of ADD-A-WIRE when there is no way to run an extra wire from your zone panel to your equipment, check out this post:
https://zoningsupply.com/blog/upgrading-thermostats-solving-a-common-problem

From an engineering perspective this is an elegant and simple solution.  Without giving away trade secrets, the ones i have tested use the a half wave bridge using diodes at the thermostat and some simple relay logic plus the another half wave at the equipment (no micro necessary) to use only 1 wire for both Y and G signals.... brilliant.

For more information, or with any questions, please contact us.

Upgrading thermostats; solving a "common" problem

So, maybe you have decided to upgrade to a Wifi thermostat, or even just a standard "programmable" thermostat... only, you come to discover that your old thermostat has one less wire connected to it than the new thermostat needs.   This is usually the "24VAC Common" wire sometimes just called "C" or "24C".   This means that your old thermostat was either mechanical, power stealing, or battery operated... which isn't a problem if you don't want a modern thermostat.  MOST modern thermostats (especially WiFi) need a "C" wire from the 24V transformer to power the thermostat... this means getting a "C" wire to the thermostat.

This isn't a new problem, it started showing up in the 1980s with the first programmable thermostats... over the years, I have suggested and used several different methods to overcome this issue both with zoning and with typical single thermostat applications.  Until recently, I couldn't really recommend anything other than running a new wire... and running a new wire isn't always possible.

METHODS to add "C" Wire

1. Run another wire to the thermostat
   The most straightforward and full-proof method is obvious: run another wire.  If possible, this is ALWAYS your best solution.
2. Power thermostat from separate transformer
   Don't use this method... it is risky and not all thermostats support the ability to separate the "R" from the equipment transformer.
3. Use the "G" wire for "C"
   This method DOES work but it limits the functionality of your thermostat control.  (ie. you will not be able to independently control fan from the thermostat)  The reason this works, is that the equipment automatically turns the fan on during a heating or cooling call, so the "G" wire controlling the fan from the thermostat is only necessary to turn the fan on by itself.  You will NOT be able to turn fan on from the thermostat by itself with this method.
   NOTE: This works with MOST equipment, but you should check or test before employing this method. (#3)
4. ADD-A-WIRE Device
   It is the BEST method and really the only method I would use if a wire cannot be run.  This is a relatively new concept to me... it has been around for a few years at least but we just started recommending it within the last 2 years.    Several companies have started offering an "ADD-A-WIRE" device that allows the addition of a "COMMON" wire.  These devices range from $15 - $40 and are very simple to wire (you have to be able to get to your equipment furnace/blower). 

How an ADD-A-WIRE Device works:

It will come in 2 pieces, one is a small box with several connections labled "R", "C", "Y", "G", "W".  You will follow the included wiring instructions to connect this box at your indoor HVAC equipment.  The other piece that comes with the ADD-A-WIRE is a wiring connector with 3 leads, this connects at the back of your thermostat as shown in the wiring instructions.
Once these two pieces are wired properly you will have the "C" you need for any thermostat... it's almost like magic (electrical engineering magic).

NOTE: Make sure all wiring is done with the power to the HVAC equipment OFF at the breaker.

A few different models to choose from (prices on amazon at time of writing)  There are many others available but they all do the same thing (NOTE: we are not compensated by any of these companies or any others for our opinions):

• LUX Products LPB-WH - $18  (Our favorite because it's the easiest to wire)
• Venstar ACC0410 - $27
• Honeywell THP9045A1023 - $15

Lux Products LPB-WH Power Bridge Provides 24V AC Thermostats in Homes without C-Wires

Lux

Buy on Amazon

For more information about specific use with zoning and zone control systems such as SmartZone... contact us

Another thing to consider:  The ecobee3 and ecobee3 LITE both come with an "ADD-A-WIRE" type device.  So, if you are thinking about a WiFi thermostat and are afraid you will need to add a wire... keep the ecobee in mind.  See our WiFi stat roundup for more info

De-humidification and SmartZone - Zone 1 Thermostat Control

Although SmartZone does not have any built-in capabilities for controlling DE-humidification (DH) or Humidification, some applications are possible by using a thermostat on ZONE 1 that does have the capability to control DH.

“DE-humidification, in most residential systems, is simply running the equipment in COOLING with LOW speed fan instead of HI speed fan.”

Before we get to zoning, the equipment being used must have the capability to control humidity.  This usually means it has a terminal (DH/BK/DS) that is energized or DE-energized by a thermostat to control fan speed of the equipment.  Controlling fan speed allows the equipment to DE-humidify the air when the fan is running in low speed.

Back to zoning, using zone 1 thermostat to control DH is not as simple as wiring directly from the thermostat to the equipment.  PLEASE DO NOT DO THIS.  The equipment and the zone thermostats are running on different transformers and this will case problems and potentially damage to some components.  You could isolate the output from the thermostat with a relay to get around this issue of different transformers but you would still have an issue with this method of wiring "around" the zone controller.  The issue can arise when zone 1 calls for DH but the equipment is already running in heat, this mixed signal might just be ignored by the equipment but we cannot take that for granted... all equipment works differently.

The best way to control DH using SmartZone on single stage equipment is by using the method below.  It may seem a little UN-orthidoxed but it is a valid APP note from the engineer at Ecojay (It's intended to work this way).

1. Select a DH enabled thermostat of your choice
2. Connect Y2/ECO on SmartZone Zone 1 to Zone 1 Thermostat DH/DS/BK
3. Connect Y2 on SmartZone Equipment toEquipment DH/DS/BK
4. Set Zone 1 "STAT TYPE" to G2
5. Set DIP switch #4 to "LOCKOUT"

Zone 1 thermostat will now enable and disable DE-humidification any time the equipment is running in the cooling mode.
NOTE: When starting cooling from OFF state, 90 second delay will occur before HIGH speed fan will energize.

Using this method we are assuming that the equipment is expecting DS/BK/DH input terminal to be ENERGIZED for high speed fan and DE-ENERGIZED for low speed fan.  This method should not be used for more than 3 zones or with multi-stage compressor equipment.

---

Sale

SmartZone-2X

Sale Price: $159.99 Original Price: $199.00

Quantity:

Add to cart

This application will work with Ecojay's SmartZone-2X and SmartZone-4X.  Learn more

Click for SmartZone-2X/4X Install Guide

MEP Drawings & Specs for Generic HVAC Zone Control System

Typical wording for HVAC Mechanical drawings to include SmartZone Zone control (2 to 8 zones):

“ECOJAY SMARTZONE ZS2X (2 ZONES) OR ZS4X (UP TO 4 TO 8 ZONES)

1. SMARTZONE CONTROLLER SHALL INCLUDE FLASH BASED MICROPROCESSOR FOR AUTOMATIC CONTROL OF UP TO 2 ZONES (ZS2X), 4 ZONES (ZS4X) OR 8 ZONES (TWO-ZS4X CONTROLLERS) ON A SINGLE HVAC SYSTEM.

2. SMARTZONE CONTROLLER SHALL INCLUDE LED DISPLAY WITH FULL TEXT STATUS
MONITORING AND DIAGNOSIS OF THE ENTIRE SYSTEM STATUS AND SUPPLY TEMPERATURE.

3. SMARTZONE CONTROLLER SHALL CONTAIN ELECTRONIC LIMIT CONTROL (ELC) SUPPLY AIR SENSOR WHICH ALLOWS CONSTANT MONITORING OF THE LEAVING (SUPPLY) AIR TEMPERATURE

5. PUSH BUTTONS SHALL ALLOW FOR DIGITAL ADJUSTMENT OF HIGH AND LOW LIMIT

4. IN THE EVENT OF SUPPLY AIR SENSOR OR SENSOR WIRING FAILURE, THE CONTROLLER SHALL CONTINUE OPERATING THE HVAC SYSTEM AS A SINGLE ZONE SYSTEM WITHOUT INTERRUPTION

6. ON HEAT PUMPS SYSTEMS, EMERGENCY HEAT MUST BE INITIATED FROM THERMOSTAT #1, NOT A SWITCH ON THE ZONE CONTROL BOARD.

7. EACH ZONE CONTROLLER THERMOSTAT TERMINAL AND EQUIPMENT TERMINAL SHALL HAVE A COLOR-CODED LED ALLOWING FOR EASY MONITORING OF THERMOSTATS AND SYSTEM CALLS.

8. ROUND ZONE DAMPER MOTORS SHALL BE 2-POSITION (OPEN/CLOSE) DESIGN WITH A SOFT-EDGE BLADE DAMPER SIZE AS ROUND DUCT IN WHICH BLADE GASKET AND SHALL BE POWERED BY 24VAC POWER OPEN / POWER CLOSE MOTOR DEVELOPING MINIMUM 10 IN-LB. OF TORQUE AT MAX 4 VA

9. RECTANGULAR ZONE DAMPER MOTORS SHALL BE 2-POSITION (OPEN/CLOSE) DESIGN WITH EXTRUDED ALUMINUM FRAME & LOUVERS & METAL SHAFT LINKAGES AND SHALL BE POWERED BY 24VAC POWER OPEN / POWER CLOSE MOTOR DEVELOPING MINIMUM 10 IN-LB. OF TORQUE AT MAX 4 VA

10. ALL ZONE DAMPERS SHALL INCLUDE ACCURATE, NON-ADJUSTABLE & ADJUSTABLE, BLADE POSITION INDICATOR AND ADJUSTABLE MINIMUM STOP CAPABILITY (MIN OPEN & MIN CLOSE).

11. AUTOMATIC, ELECTRONIC BYPASS DAMPER WITH STATIC PRESSURE CONTROL IS REQUIRED WITH 24V ELECTRIC ACTUATORS UNLESS NOTED OTHERWISE.

12. ZONE CONTROLLER, DAMPER MOTORS AND THERMOSTATS SHALL BE POWERED WITH A SEPARATE 24V FUSED TRANSFORMER (TYPICALLY 40VA) PROVIDED BY HVAC CONTRACTOR.

13. CONTACT ECOJAY.COM or 1-888-523-ECOJAY FOR MORE INFORMATION OR TRAINING
”

View fullsize

Need more than 40VA to power LOTs of dampers on one SmartZone?

Some systems with many small ducts leading to each zone can require lots of dampers.  The example below is a 2 zone system that requires 6 dampers per zone (12 total).  If you look at the zoning guide, you will find that you should budget for at least 55VA for this system... but you only have 40 VA transformers.  75 and 100 VA transformers can get VERY expensive!  Instead you can use two 40VA transformers, but not how you think.  It can be dangerous and unreliable to connect transformers in parallel to create ~80VA.  We recommend the method below that employs the use of a simple relay to separate half of the dampers to be powered from a second transformer and the other half being powered by the SmartZone and it's transformer.

View fullsize

See the SmartZone Install Guide to calculate required VA.

It is always necessary to verify that the PRIMARY side power is sufficient to power the transformer connected.  A dedicated PRIMARY circuit is best but not always possible.  If sharing the 110V or 220V circuit, make sure the total power required for all devices connected (including zoning transformers) doesn't exceed the capacity of the circuit (usually 15 or 20 AMPS).

Where to get a relay?
Any 24V relay with a DPST or DPDT configuration will work.  The one pictured in the above diagram is available at ZoningSupply.com (see below).   If you are chosing your own relay, the "Contact" current rating will determine how many dampers can be connected.  (For example: A 10 Amp relay can handle up to 10 power open, power closed dampers)

24V Relay - DPDT

$14.99

Quantity:

Add to cart

Power Open/Close Motor

from $79.99

w/ LEDs: Select w/ LEDs NOYES

Quantity:

Add to cart

New & Improved Rectangle Dampers available at ZoningSupply.com

Tired of flimsy residential-grade rectangular dampers that easily bend and bind and, worse yet, stop working prematurely.  We, at ZoningSupply, are too!  And, we have the answer with this commercial-grade, super-duty rectangular damper.  Like all of our power dampers, it includes the best motor in the industry (Belimo) and now is constructed with heavy guage aluminim for rigidity and long-life.

Heavy-Duty

Rectangle Damper

Rectangular HVAC Dampers

from $199.99

6" X 6" thru 24" X 24"
SUPER Heavy-Duty
Aluminum rectangular damper w/ Ecojay by Belimo motor
Built to stand up to use and abuse

ATTENTION:

Due to delays receiving raw materials, the shipping time on these custom rectangular dampers has been extended: UP TO 3 or 4 WEEKS

We are very sorry about this delay and will be back to normal shipping times by the end of the year. Please call us if you have any questions or concerns about your order.

SPEC SHEET

SHIPPING TIME: UP TO 3 or 4 Weeks

(because they are custom made to order)
RETURNS for rectangular dampers require 25% restocking fee because they are custom made to order... please be sure you order the correct size.

NOTE: The motor will always be mounted on the “HEIGHT” side

Height: Select Height 06081012141618202224

Width: Select Width 06081012141618202224

Quantity:

Add to cart

No other rectangle zone damper on the market is as sturdy or reliable.  Simplicity of design and precision manufacturing in the USA (Ohio & Texas) make for the BEST rectangular damper that has ever been available to the residential zone control market.  Try it for yourself today.

Ashrae 62-2 Ventilation (Fresh Air) sizing & calculation

Many homes these days have such tight seals around doors, windows, and even closed-cell foam insulation... they are almost air-tight.  You can think of an old house like an antique metal or wooden ice box where modern homes are more like Yeti coolers.  While this is great for keeping temperatures steady inside the home, it also can trap moisture and toxic gases inside.  Fresh air ventilation is necessary to keep a healthy and efficient home.

But how much fresh air is needed?  If you bring in too much, you will make your HVAC equipment work too hard and loose efficiency.  If not enough fresh air is brought into the home, the air can become humid and allow mold growth or VOCs and other toxins can build up.  Luckily, the national organization ASHRAE has a specific recommendation for the amount of air based on occupancy and square footage of the home.  See table below.

Taken from SmartZone-4X Install Guide

However, this table should not be taken as gospel.  Just like other HVAC calculations and estimations, many factors are not really being taken into account with this rough estimate based on # of bedrooms (occupancy) and square footage.  Some adjustments may be needed based on factors such as climate, ceiling height, other air-leakage, etc.  To comply with 62-2 is the baseline & adjustments can be made in the field by setting run-time.

Learn more about how SmartZone-4X can control fresh air more efficiently than a separate fresh-air controller in the Install Guide

Fact or Myth? #HVAC #Zonecontrol can save energy

First of all, if you are not familiar with HVAC Zoning (Zone control) for your home you can click here and learn more about how it works.

Sometimes, zoning is pitched as a device that can be added to your current HVAC system that will "save you energy" because you are able to turn "off" heating and cooling to areas that are not being used.  Sounds good, right?  Well...there a "but."  This as actually a highly debated or more aptly put... highly contested claim among HVAC professionals.

The simple fact is that it isn't a simple answer but the simplest version is:  HVAC Zoning CAN save energy in some applications.

Not all applications of zoning are intended to save energy, some are set up to optimize comfort.  In these situations, energy savings may not the top priority but it can still be set up to help save energy when the comfort is not in demand.

Zoning puts the control in the hands of the user (homeowner) via the thermostats.  These thermostats can be set to optimize energy savings or comfort... or, most likely, somewhere in between.

Some believe the primary purpose of zoning is comfort & I would agree, but, SmartZone can be used in some applications to save energy by reducing necessary run-time.

As far as I have found there have been very few and NO independent studies on the energy savings capabilities of hvac zone control but I have personally been in the industry for 14 years and I believe I know why.  Every test I have seen is try to prove some % of energy savings and yet there is a flaw with even the question that is being asked.  The problem with this question is that it is looking for an automatic percentage saving when zoning is installed.  I think this gets to the heart of why the professionals that dispute zone control's ability to "save energy" do so. 

This is an IMPORTANT NOTE:  HVAC Zone Control by itself will NOT save energy.  However, it CAN be used to save energy.

A proper study to prove that zone control CAN save energy would be straight-forward.   Two identical houses with identical hvac systems, one with a 2 zone system & the other with a single thermostat.  On the house with zoning, set one thermostat to OFF 12 hours per day and the other thermostat to run a normal 24hr / 7 day schedule.  The thermostat schedule should be the same as the 24hr / 7 day schedule in the house with only one thermostat.  This study would show that zoning can save energy if used in certain ways.

SmartZone has been around since 2004 and we have over 200,000 installed in the field.  We have seen direct feedback that empirically shows energy savings, not just in isolated cases but in extremely high volume.  First hand, real-world experience shows that it can be done, but it also shows that in cases where comfort is the priority... energy savings isn't a guarantee with zone control.

Check out SmartZone at ZoningSupply.com

Sale

SmartZone-4X

Sale Price: $239.99 Original Price: $299.00

Quantity:

Add to cart

NEW to ZoningSupply - Insertable (Retrofit) Dampers

We are proud to announce the continuation of our damper product line here at ZoningSupply.com with the "Insert-able" damper.

Some applications call for dampers that can be "slipped" into round duct that is spiral or other hard pipe style duct.  This is not intended for use with flex-duct but can be used with any other type of hard duct.  Simply cut a slit in the duct, insert the damper and screw it down.

PRO-Grade Insert Zone Damper (Retrofit)

from $49.99

4", 5", 6", 7", 8", 9", 10" ROUND Diameter Dampers

12” & 14” Diameter insert dampers require additional hole to be drilled in duct opposite damper. (grommet included to insert shaft)

FEATURES:
Industry-leading quality & highest reliability, Belimo Motor, Full-seal gasket blade, makes mounting in any round duct easy with these super-heavy duty retro-fit slip-in dampers

NOTE: All dampers subject to a 10% restocking fee.
 

Motor: Select Motor YES MotorNO Motor

Diameter: Select Diameter 4"5"6"7"8"9"10"12"14"

Quantity:

Add to cart

For more dampers from ZoningSupply click here

Air balancing information & IOT evaluation from ContractingBusiness

Good articles that can affect HVAC zone control

“If your technicians aren’t checking system airflow on every service call, you’re doing your company and your customers a disservice. Air balancing is the missing link in getting residential HVAC systems to perform at or near their peak levels.”

— ContractingBusiness.com

http://contractingbusiness.com/iaq-amp-ventilation/residential-air-balancing-missing-link

---

“It is easy to be confused when it comes to the Internet of Things (IoT), with so many products and objects being connected and made more intelligent. It sounds overly complex, but one application that is easy to understand is HVAC IoT.

HVAC IoT is made up of a system of smart thermostats placed throughout building zones. The devices, and therefore the zones, are connected over wireless and software and work together as one brain. The brain has a nervous system with sensor endings in every room, hallway or lobby to monitor any environmental changes that could prompt the HVAC system to react”

— ContractingBusiness.com

http://contractingbusiness.com/controls/hvac-and-iot-simply

HVAC Contractors: Out-Perform the Competition with ZoningSupply.com

Contractors nowadays are finding that homeowners and business-owners are looking for all the bells and whistles they can reasonably afford and install. Among features like energy-efficient fixtures and home-automation, HVAC zoning is usually near the top of this list. Of course, zoning offers multiple benefits to homes and buildings as it can save energy and provide a custom level of comfort.

As HVAC zoning rises in popularity, homeowners and business-owners are beginning to ask for it by name.

How can contractors make the most of this movement?
It starts with choices. Many contractors have unfortunately limited themselves to zone control systems that sit at the top of the market (as well as the top of the price-range.) This would be great if these “name-brand” zoning systems offered quality, reliability and features that justified the price. This is simply not the case. Contractors who have worked with zoning for a while can attest to this. The good news is that there are now many choices when it comes to zone controls, dampers, and equipment. Contractors and suppliers can now sift through the choices and figure out which systems are the simplest to install, the most reliable, and provide the best customer support.

This is where ZoningSupply.com comes in. ZoningSupply guarantees their products to be the most reliable, the easiest to install, and the most affordable in the marketplace. Hundreds of contractor and homeowner testimonials over the past 10+ years sing praises of the top-notch products they offer.
Here’s why . . .

Contractor-Friendly
The engineers behind ZoningSupply products will tell you that their systems were designed with the contractor in mind. In other words, full-color install guides, screwless wiring, and color-coded LEDs are only the start. If a contractor picks up the phone and talks to Jeff or one of our other tech-support specialists, they’ll be sure to have all of their questions answered quickly but thoroughly.  

Easy-to-follow instructions and simple design make for a lightning-fast install.  

Ship Direct for Free
Furthermore, ZoningSupply.com can ship anywhere in the U.S. for free. Individual components or entire systems can be purchased on the website and delivered straight to your office or job site,  

Affordable
ZoningSupply’s featured SmartZone 2x, 4x, and 2L systems are among the most affordable in the marketplace. This puts money in your pocket and provides savings that can be passed along to homeowners.

Universally Compatible
If a contractor uses ZoningSupply, they can confidently offer retrofit options for virtually any existing HVAC system on the market. This means not having to learn and re-learn various installation procedures. This also means that nearly every home or building in your area can be retrofitted for zoning . . . Think of the opportunities!

With zone control systems, as with any product, there are the good, the bad, and the ugly. In the end, they all must answer to the contractors and ultimately the homeowners. When bidding on projects or marketing their services, contractors should equip themselves with the confidence and reliability that ZoningSupply.com products provide.