Most of the furnaces installed in Scarborough are single-stage furnaces. If you are reading this, you probably want to know if any benefits come with having a multi-stage operation. The answer is yes.
When a furnace has a multi-stage operation, it usually has a valve that regulates the flow of gas into the burner and heat exchanger. With a single-stage furnace, the gas flows at 100% when the furnace is switched on. This is irrespective of how many degrees have to be increased.
A 2-stage furnace has a thermostat. When temperatures fall below the set temperature on the thermostat, the furnace lights up on a lower heating stage. This is usually 60% of gas flow. If the desired temperatures are not achieved in 10 to 16 minutes, the regulator opens up to allow gas to flow at 100%. The concept is the same for a 3-stage furnace. The only difference is that a 3-stage furnace has three settings: 40%, 60% and 100%. Although they are not true modulating furnaces, 3-stage furnaces are described as modulating furnaces.
A true modulating furnace has several settings: 40 to 50 settings. The settings have small increments, which start at 30%. An example of a true modulating furnace is the Carrier’s INFINITY 98. It is the only furnace on the market that modulates down.
Taking a look at a scenario can help you get a better understand of the three options. If you own a single-stage furnace and the temperature on your thermostat reads 20C, and the furnace is off, you may want to adjust the thermostat to 21C if you are feeling chilly. When this happens, the furnace lights up with the gas valve opening up fully. The furnace lights up at full capacity to increase the desired 1C. As a result, it will tend to get hot, and the thermostat may read up to 23C by the time the furnace is turning off. The temperatures will then drop to 21C and then further below 21C, and the furnace will light up again, and the process continues. As you can see, the main drawback with the single-stage furnace is temperature fluctuations due to the lack of control over the gas flow.
If you own a single-stage furnace, you have most likely noticed the issue of temperature fluctuations. The issue can be solved by installing a multi-stage furnace. Multi-stage furnaces increase temperatures gradually. Multi-stage furnaces enable you to increase the temperatures gradually. The more stages a furnace has, the more control you will have to attain desired temperatures. The best thing is everything happens gradually—no more temperatures going above the set range on the thermostat.
Multi-stage furnaces offer two key benefits:
- Better temperature control: Gradual temperature changes ensure there are no temperature fluctuations.
- The furnace is quieter when operating: The furnace will not need to run at full capacity, so the furnace will be quieter. A low gas flow rate has always been linked to lower noise. When gas flows at 100%, there will be increased vibrations which lead to more noise.
We are very happy about the Carrier multi-stage furnace. The furnace uses a patented technology called adaptive logic. Contact us now to find out more about this technology.
Misconceptions on the Number of Heating Stages and Energy Saving
The first fact you need to understand is that having multiple furnace stages does not affect its efficiency and the rate at which it uses gas. You still require the same amount of gas to heat a house to the desired temperature. The only difference is that a single-stage furnace uses more gas within a shorter time to achieve the desired temperature. For multi-stage furnaces, the furnace in the lower stage will still use the same amount of gas as the single-stage furnace to raise the temperatures by the desired degrees. Therefore, fuel consumption for multi-stage and single-stage furnaces is the same.