If you are in Vaughan, you probably own a single-stage furnace. This is the most common furnace in homes. What you may be wondering is why you may need to move to a multi-stage furnace? What are the benefits?
A single-stage furnace allows full gas flow to the burner and heat exchanger when the furnace is switched on. On the other hand, a multi-stage furnace is equipped with a valve that regulates the flow of gas to the burner and heat exchanger.
In a 2-stage operation, a valve regulates the flow of gas at about 60%. If the furnace doesn’t increase temperatures to the desired level within 10 to 16 minutes, the valve will open at 100%, allowing full gas flow. A 3-stage furnace uses the same concept only that it has three gas flow stages: 40%, 60% and 100%. The ability to regulate the flow of gas makes a 3-stage furnace a modulating furnace. Even so, the 3-stage operation doesn’t make a furnace a true modulating furnace.
If you need a true modulating furnace, you need to focus on those with more than 40 settings on their gas valve. The valve increases at tiny increments from 30% all the way to 100%. The Carrier’s INFINITY 98 is an example of a true modulating furnace. This is also the only furnace on the market that modulates down.
To understand the benefits of having a modulating furnace, we have to consider a scenario. Imagine your thermostat is set at 20C, and you feel cold, so you set the thermostat at 21C. When using a single-stage furnace, the furnace will light up, and the gas valve will open fully. The gas will operate fully to increase the temperatures by 1C. The problem with this operation is that temperatures in the room will start getting hot, and the thermostat may go all the way up to 23C by the time the furnace is switching off. The temperatures will then drop to 21C. When they fall below 21C, the furnace will light up, and the process will continue. The lack of control leads to significant temperature fluctuations.
You have probably noticed these fluctuations if your home uses a single-stage furnace. The issue can be solved by installing a multi-stage furnace. These furnaces increase temperatures gradually, which eliminates the issue of fluctuations.
Multi-stage furnaces offer better control. When they are switched on, they will increase the temperatures gradually. If only a 1C needs to be increased, a multi-stage gas valve doesn’t need to open wider than 60%. If the temperatures have to be increased by more degrees, the gas valve will open wider if the desired temperatures are not reached within a certain time.
Multi-stage furnaces offer two main benefits:
- Better temperature control: You achieve gradual temperature change. This helps eliminate temperature fluctuations.
- The furnace is quieter, meaning: The more gas flows into the burner, the more pressure will be experienced, and more vibrations will be noticed. More vibrations lead to more noise. A lower gas flow rate equals lower sound.
Call us now to find out more about the unique technology in the Carrier multi-stage furnace. The patented technology is called adaptive logic.
Common Myth About the Number of Heating Stages and Energy Saving
Having more heating stages does not make a furnace more efficient or use less gas. To heat a house, you still need the same amount of energy. Having a multi-stage furnace simply means you will use the same amount of gas as a single-stage furnace only for a longer period. The fuel consumption of a true-modulating furnace is the same as that of a single-stage furnace.