Thermostat settings are set to "heat" modeWhen the temperatures drop, it's important to remember to switch the settings on your thermostat to "heat" mode.
Check your furnace switch
A switch on your furnace that looks like a normal light switch should be Up or On position. Allow couple of minutes for the system to kick on.
Furnace Filter Change
We recommend replace your filter every one to three months for best performance. Dirty filters is one of the most common causes of inefficient furnace performance.
Check the Circuit Breaker
Find the circuit breaker that controls your furnace and check to see if it in the middle or Off position. If it is, set the circuit breaker to Off and reset it to the On position.