Gas furnace doesn't heat above 62 when very cold outside


Old 02-28-15, 11:06 AM
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Gas furnace doesn't heat above 62 when very cold outside

My Carrier Weather Maker Infinity gas furnace (installed 2005) doesn't heat above 62 when very cold outside, below 15-20 degrees. Does fine otherwise. This has been a cold winter with temps that low often. This hasn't happened in other winters.
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Old 02-28-15, 12:18 PM
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Have you checked your ducts for leaks or missung insulation?
If you will supply a full model number (usually on a sticker near the burners), we should be able to learn a bit more about that particular model.
Old 02-28-15, 01:26 PM
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If you also have the Infinity thermostat, what does the thermostat recommend that you check??

If you have a standard thermostat, count the flashes at the furnace when it fails to heat and post this information for better assistance.
Old 02-28-15, 05:17 PM
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Best to do a heat-loss calculation for your house. (There are readily available software for that.)Perhaps your furnace is simply undersized?

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