I just moved into my house and I am wondering if this is normal for a furnace.
So I have my furnace set to 68 degrees. The temperature on the thermostat says 66 degrees. The furnace is on, but does not appear to be blowing warm air (I guess I would describe the air as not warm, but not cold).
So then I turn the furnace up to 71, and the thermostat still at 66 degrees. The air coming out of the vents is warm.
I have not tried this long enough to see what happens as the thermostat approaches 71 degrees.
Is this normal? As the temperature on the thermostat approaches its setting does the temperature of the air coming out of the vents decrease?
Best Answer
It sounds to me like you've got a two stage furnace.
Stage 1, low heat, just enough to maintain temperatures. Won't produce warm air, just warm enough air - much more efficient than running full burn.
Stage 2, high heat, for when it's actually cold. Produces WARM air intended to raise temps. Less efficient than stage 1, but gets the house warm. Stage 1 follows.
The alternative is a 1 stage furnace that's full on, full off, and thus must cycle on and off over and over again.