Furnace Setback Temperatures

We are often asked about how low to set the thermostat to save money on your heating bills. Obviously, you save more money the less your equipment operates. So, how cold can you stand it in your Southern Indiana/Louisville home?

Are you a Scrooge and want to keep it 40°F in the house? Well, there is a limit. When a furnace is operating, all of the combustion gases are just that – gases. We don’t want any of them to condense into a liquid while in the primary heat exchanger or vent. So, manufacturers recommend keeping the temperature above 60°F.

What happens if the gases condense in your furnace or vent? When they condense, they form acids. These acids will eat the metal in the vent and heat exchanger. This drastically shortens the life of your system.

So, what’s the answer? Set your thermostat as low as you can bear but keep it above 60°F in the winter.

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