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Question: Is there more than one way to set a High Efficiency Furnace?

high efficiency furnace
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Question by CK: Is there more than one way to set a High Efficiency Furnace?
I have a Trane High Efficiency forced hot air furnace. It seems to be set to come on as soon as the temperature drops below the set temperature. I thought it could be set to go past the set temp and then comes on when it hits that temp. Which is more efficient? The way it is set now it seems to come on every 15 minutes.

Best answer:

Answer by Noah M
The settings you are looking for are in your thermostat. I assume you have a digital thermostat attached to the system, which should have come with instructions for set up. You need to adjust the temperature differential to plus or minus three or four degrees instead of one degree. This will allow the temperature to drop to three or four degrees below set point before the unit comes on, and raise to three or four higher before shutting off.

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2 Responses to Question: Is there more than one way to set a High Efficiency Furnace?

  1. William B

    the way its set now

  2. Peter W

    The operation of your furnace is determined both by its internal operating software and how it is matched with the thermostat. If you are using an old-fashioned single-stage stat, the anticipator setting on the stat may not match the furnace – this is a small lever inside the stat that you can move to various numeric settings. The owner’s manual for the furnace should give the proper setting. Otherwise, you should obtain a “smart thermostat” that has internal software that will allow you to set things like overshoot and low-temp start settings. Some of them are smart enough to ‘learn’ how the furnace responds and will work set-backs to heat the house by the set time (vs. starting at the set time) and so forth.

    As to overall efficiency – if you have a modulating furnace, it will run more frequently than a fixed-output type as it is modulating the flame to maximize the heat-transfer efficiency across the heat exchanger. This also minimizes flue losses, another good thing. Our high-efficiency *boiler* will run for several hours at a time but modulate the flame across the entire time rather than getting very hot then cooling down. This option is not as easy to manage with an air heat-exchanger as it transfers heat less rapidly than water, so you will get short cycles once the system has reached a basic operating temperature.

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