It's blowing and snowing like crazy here in Michigan!
Got home from dinner, and I found the house at 66 with thermostat set
at 71. Furnace would not light, but I suspected the combustion air
was restricted, which was the case (inlet capped w/ snow). Fifteen
minutes later, we had heat.
My wife said she was glad I discovered this at 9PM instead of 1AM ...
me too, then it hit me.
If the thermostat is set at 71, and the temperature is always
maintained between, say, 69 and 71, then anytime the house temperature
falls to 68 (let alone 66), it would be abnormal. Is there such thing
as a thermostat with a low (or high) temperature alarm that is some
offset from the setpoint (e.g. +/- 3 degress)?