Choosing the right HVAC zoning system doesn't have to be complicated. Ecojay's SmartZone family offers three options designed to fit different residential zoning applications: the SmartZone ZS2, ZS3X, and ZS4X.
All three systems provide the core benefits of HVAC zoning—allowing different areas of a home to be controlled independently—but each model offers a different combination of zone capacity, features, and expansion capability.
So which SmartZone is right for your project?
SmartZone ZS2: Simple and Affordable
The SmartZone ZS2 is designed for straightforward two-zone HVAC applications. If your goal is simply to divide a home into two independently controlled comfort zones, the ZS2 provides an economical solution without unnecessary complexity.
It's a particularly good choice for smaller homes, additions, or installations where advanced zoning features aren't required.
Choose the ZS2 when:
You need two HVAC zones
You want a simple zoning solution
Keeping equipment and installation costs down is a priority
Advanced ventilation, dehumidification, or expansion features aren't needed
SmartZone ZS3X: The Best Value
For many residential installations, the SmartZone ZS3X provides the best combination of features and value.
The ZS3X supports three zones and adds several advanced capabilities beyond the basic zoning functions of the ZS2. These include enhanced equipment staging, ECO/Away operation, ventilation control, dehumidification functionality, and additional system configuration options.
This makes the ZS3X a versatile choice for contractors who want a feature-rich zoning panel without stepping up to the largest SmartZone model.
Choose the ZS3X when:
You need three zones
You want advanced zoning features
The HVAC system uses multiple stages
Ventilation or dehumidification control is desired
You want a strong balance between price and capability
SmartZone ZS4X: Maximum Flexibility and Expansion
The SmartZone ZS4X is the flagship model in the SmartZone family. It controls four zones as a standalone system and can be expanded to as many as 20 zones using SmartLINK.
That makes the ZS4X particularly well suited for larger homes and more complex HVAC zoning projects where additional zones may be needed now or in the future.
The ZS4X also includes the advanced features found in the ZS3X, giving contractors a highly flexible platform for designing customized zoning systems.
Choose the ZS4X when:
You need four zones (or more)
The home is large or has multiple comfort areas
You anticipate adding zones in the future
You want maximum system flexibility
You need advanced zoning and equipment-control features
Which SmartZone Should You Choose?
The easiest way to think about the three models is:
ZS2 = Simple & Affordable
A great choice for basic two-zone applications.
ZS3X = Best Value
The ideal balance of features, flexibility, and cost for many residential systems.
ZS4X = Maximum Flexibility
The choice for four-zone systems and projects that may eventually require expansion.
Before selecting a zoning panel, it's important to consider not only the number of zones but also the type of HVAC equipment, staging requirements, ventilation needs, and whether future expansion is likely.
Compare the SmartZone Models
Use the feature comparison chart above to see how the ZS2, ZS3X, and ZS4X compare side by side.
Whether you're installing a simple two-zone system or designing a larger multi-zone application, there's a SmartZone solution designed to fit the job.
Explore the SmartZone family at ZoningSupply.com or learn more about Ecojay SmartZone zoning systems at Ecojay.com.
Full-featured SINGLE-stage 2-zone controller on a budget
Simplest version of SmartZone ever
2 ZONE control - (Replaces SmartZone-2L for Single Stage)
Gas, Electric or Heat Pump
1 stage COOL <> 2 stage HEAT
NEW PRODUCT - 2025 - Shipping now!
SmartZone-3X 3.0 is the newest addition to the SmartZone family of zone controllers. It has been engineered to make installation easier than ever before. This product will replace the SmartZone-2X, giving our customers and extra zone. For those familiar with SmartZone already, you will see the similarities but with improvements including upgraded display and the addition of built-in FRESH AIR and ECONOMIZER controls.
4-Zone Controller
NEW for 2025 - SmartZone better than ever
Replace almost any brand existing zone control ... use with any thermostats (including WiFi).
Control heating and cooling comfort room by room.
EASY INSTALLATION - no screwdriver or voltmeter required
UNIVERSAL COMPATIBILITY - drop in replacement for many models (see list in Additional Info)
BEST FEATURES - built in Fresh Air Control, expansion port up to 20 Zones
SUPPLY AIR TEMP SENSOR - included for Smart-Staging & equipment protection
DESIGNED & ASSEMBLED IN THE USA
