Do I Need A Special Thermostat For A Two-Stage Furnace?

You recently replaced a defective furnace, and you’re wondering if your old thermostat can be used with your current two-stage furnace. There are several reasons why you might need to replace an outdated furnace before you can move into a new home. But Do I Need A Special Thermostat For A Two-Stage Furnace?

It’s a no, but there are a couple of caveats to that. Although a standard thermostat can be used with a two-stage furnace, additional considerations are to keep in mind. If you have a two-stage furnace, you may want to read on to learn more about the pros and cons of keeping your current thermostat or upgrading it.

Special Thermostat For A Two-Stage Furnace

What Is A 2-Stage Thermostat?

A 2-stage furnace’s stage two burners can be turned on with a 2-stage thermostat. Turning on the stage, two burners raises the temperature of your furnace. Temperatures can be controlled for different times of the day, such as when you get up and go to sleep, with programmable 2-stage thermostats.

How Does A 2-Stage Thermostat Work?

A 2-stage thermostat, at its most basic, can turn on the furnace’s stage two burners based on certain parameters. After reaching the desired temperature, the stage two burners are turned off, and the stage one burners (low heat mode) are used exclusively to maintain them.

Modern two-stage furnaces automatically engage their stage two burners if the goal heat is not obtained after a pre-determined amount of time (the exact number of minutes can vary per model and manufacturer). This can lead to wasted gasoline if you don’t have a two-stage thermostat.

Stage two burners automatically activated by furnaces can waste fuel since they can be activated even if they are not needed. In the same way as when it’s just a few degrees off. This can happen if you have a single-stage thermostat and a two-stage furnace.

Temperature variations can be calculated and compared to the furnace’s rate to heat the house using an advanced two-stage thermostat. It uses fewer stage two burners and more stage one burners to stabilize temperatures.

These two-stage thermostats monitor the time it takes to get to the desired temperature. To ensure that you wake up in a warm house, the thermostat can be programmed to start at a specific time the following day. It’s capable of calculating the best time to turn on the heat without resorting to stage 2 burners.

What Is The Distinction Between A Single-Stage And A Dual-Stage Thermostat?

A two-stage thermostat is explained above. On the other hand, a single-stage thermostat can switch the furnace on and off depending on how much heat is needed. The key distinction is that a single-stage thermostat cannot manage whether a two-stage furnace is set to high or low heating. The fuel savings that a two-stage furnace can provide may be reduced.

Is It Possible To Use A Single-State Thermostat With A Two-Stage Furnace?

The answer is yes, but there is a condition. Control boards for two-stage furnaces are usually adjustable to work with a single-stage thermostat or a two-stage thermostat. A single-stage thermostat for a two-stage furnace will ignite the stage two burners after a certain amount of time, and the thermostat’s signals will not be used to control the furnace’s operation.

Stage two burners can waste fuel if they’re left on when they’re not needed. Inconsistent and uneven heating can also be a problem. In addition, many thermostats can alter furnace start times and avoid utilizing stage two burners entirely. Stage one burners can be used earlier and longer to achieve and maintain the desired temperature.

The number of times the furnace has to shut down and restart during the day can be reduced by using stage one burners to maintain the temperature. As a result, the furnace’s components last longer. To replace a single-stage thermostat with a two-stage thermostat, you’ll need to run additional wiring through the wall. If you don’t feel it easy doing this yourself, hire a professional to perform it for you.


So, Do I Need A Special Thermostat For A Two-Stage Furnace? The furnace will not be harmed by using a two-stage thermostat. A single-stage thermostat is compatible with the control board, so the furnace may still run both stages. After around 10 minutes, the control board would activate the second stage.

It is possible to utilize a single-stage thermostat with a two-stage furnace, but the efficiency and fuel economy that a two-stage furnace can provide will be reduced. The greatest way to save energy is to pair a 2-stage thermostat with a 2-stage furnace. Your furnace’s parts can also benefit by lowering the number of times it shuts down and restarts during the day.

Frequently Asked Questions

What does Stage 2 mean on my thermostat?

When a dual-stage furnace’s thermostat says “Stage 2,” that means the furnace is on the higher setting, providing you with 100 percent of its capability. Almost 80% of the time, the lower setting of a dual-stage furnace is sufficient to offer household comfort.

Do two-stage furnaces have a higher frequency of operation?

Two-stage furnaces consume less fuel than ordinary furnaces because they can operate at a lower level based on the actual heat required and spend a long time in that setting.

Is it necessary to have a two-stage thermostat for a two-stage furnace?

Comfort would be improved by using a two-stage thermostat, but not efficiency. A control board on any two-stage furnace can be set to use either a single or two-stage thermostat. The control board will time the second stage if you utilize a single-stage thermostat.

What is the distinction between a two-stage gas furnace and a single-stage gas furnace?

Said, a two-stage furnace is a gas furnace with two heat settings: low and high. Furnaces should be adjusted using a load calculation algorithm that considers the efficiency of the home (windows, insulation value, etc.).

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