Two stage heat

Josh M.

Can anyone explain two stage heat?

Bill_14

TWO-STAGE HEATING

The following excerpt is from Lennox literature:


WHAT IS TWO-STAGE HEATING?

Do you sometimes find it challenging to obtain the ideal temperature within your home during the winter months? First it's cold so you turn up the thermostat which starts the furnace; then it's hot so you turn it down again.

Traditional furnaces are designed to heat your home, and keep you warm during the coldest weather in your climate, therefore, they operate at one level - high. However, even during winter, temperatures fluctuate and many winter days can be somewhat mild.

Unlike traditional furnaces that turn on and run at full capacity with each demand for heating, two-stage furnaces operate like two separate furnaces to maintain more consistent comfort in your home. The unit starts out running in its first stage, and operates at about 68% of its heating capacity. This reduced capacity is sufficient to warm your home on mild winter days. But when the temperature outside really drops, the furnace adjusts to full capacity (second stage) to meet the demand for heat within the home. It's kind of like having two furnaces for the price of one. With two-stage heating you won't have to keep adjusting the thermostat.


WHAT ARE THE ADVANTAGES OF TWO-STAGE HEATING?

Consistent Comfort: Thanks to two-stage technology, the temperature inside your home should vary only a few degrees versus the larger temperature swings that are common with traditional furnaces.

Quiet Comfort: Because a two-stage furnace starts in its first stage, when the level and amount of heat required is lower, and runs in this stage the majority of the time, it greatly reduces the noise associated with furnaces that turn on and run full blast. Two-stage technology means quiet comfort.

Improved Air Filtration: A two-stage furnace provides more consistent airflow and with more consistent airflow comes improved air filtration, which means you'll breathe easier with two-stage heating.

Efficient Operation: Because the furnace spends the majority of its time operating in its lower capacity, first stage, it burns less fuel than a traditional furnace that always runs at full capacity and then shuts off when heating demand is met.