Is Your Furnace Short Cycling?

"Short Cycling" is when a furnace turns on and off too quickly before it has heated your home to the thermostat set point. Sometimes, no heat is made at all before shutting down.

Here are the top reasons why your furnace may be short cycling:

Too Big Bigger is not better and it will not heat up your home any faster. A furnace that is too powerful for your space will consume too much energy, short cycle, and will cost you big in the long run.

Overheating Your furnace may shut itself down to protect itself from over heating. If it overheats, it may crack the heat exchanger, leaking carbon monoxide into your home.

Dirty Air Filter The main cause for overheating is from restricted airflow from a dirty air filter, which can block interior vents and exhaust vents to the roof.

Malfunctioning Thermostat If your thermostat is malfunctioning, anything can happen from short cycling to a complete shut down.

If your thermostat is improperly installed too close to a heat source, the thermostat will get hotter faster than the rest of the home, causing short cycling.

Short cycling is a huge energy efficient problem, if you suspect your furnace is short cycling, call 72 Degrees Comfort Company at 515-965-7272 or email us at

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