What Is HVAC Zoning and Is It Worth It for My Las Vegas Home?

Most Las Vegas homes have just one thermostat. It measures the temperature at a single point in the house and tells the entire HVAC system when to run and when to stop. The system heats or cools every room equally, whether they need it or not.

That setup is fine in small, single-story homes where the heat load is relatively uniform throughout. It’s a different situation in two-story homes, large homes, homes with west-facing rooms, homes where occupants have different schedules, and those where some spaces are consistently harder to keep comfortable than others.

In Las Vegas, thermal variation between a north-facing bedroom and a west-facing living room in July can be dramatic. A single thermostat usually means someone in the household is either too hot or too cold at any given moment. If that sounds like you, HVAC zoning could be the answer.

What Does a Zoning System Do?

A zoned HVAC system divides the home into independently controlled areas (zones), each with its own thermostat. Motorized dampers in the ductwork open and close to direct conditioned air to whichever zones need it, and block airflow to zones that have already reached their setpoint.

The result: your upstairs master bedroom can be set to 70 degrees while the rarely-used guest room next to it sits at 76. Your home office can be nice and cool during work hours and backed off in the evening. The western side of the house can get extra cooling while the shaded north side doesn’t get too cold.

A zone controller coordinates all of this.

Why Do Las Vegas Homes Benefit So Much?

Sun exposure in the Las Vegas Valley is extreme and highly directional. Homes built with west-facing living areas or south-facing bedrooms get afternoon heat loads that are very different from what’s happening on the other side of the same house at the same time. A single thermostat in a central hallway can’t do much to handle the issue.

Two-story homes in Henderson, Summerlin, and other areas also have to deal with what’s called “heat stratification.” Warm air rises, and upstairs rooms absorb heat through the roof that downstairs rooms don’t. On a 110-degree day, the difference between the first and second floor can be 8 to 12 degrees.

There’s also the fact that zoning means you’re not having to heat or cool rooms that aren’t being used, which reduces how much energy your system uses, as well as wear and tear on system components.

What to Expect From the Installation

Zoning retrofits vary depending on things like your home’s duct configuration and the number of zones you want to create. A two-zone system in a two-story home is relatively simple. A four-zone system in a large single-story home with multiple living areas is much more complex.

Note that zoning works best with variable-speed or two-stage equipment. When dampers close off zones, the remaining open ductwork needs to handle the system’s output without creating excessive static pressure. A variable-speed system that can throttle back as zones get to temp avoids this problem.

If you’re thinking about zoning on an existing single-stage system, a technician should evaluate the duct configuration and equipment compatibility before installation.

Is HVAC Zoning Worth It?

For a large home, zoning is almost always worth considering. Interested in learning more? Our air balancing and home zoning team can assess your home’s duct layout and tell you what a zoning installation would involve and what results you could realistically expect.