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Old 12-19-2010, 10:18 AM   #1
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Furnace supply temperature question


What should the supply temperature be on a 80% 75000 BTU furnace? I've read it should be between 140-160? My registers are getting 120 and my temperature right after the furnace is 148 degrees.

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Old 12-19-2010, 10:44 AM   #2
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Furnace supply temperature question


Look inside the furnace for a name plate. There will be a temp rise range given there.

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Old 12-19-2010, 11:30 AM   #3
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Furnace supply temperature question


Unless your furnace is cutting out on over temperature safety switch and your filter is not dirty your furnace is running a bit high but with in the acceptable temp rise limits.

On a an 80% I'd like to see closer to a 135*F trunk temp within one to three feet of the plenum but that would be with perfectly designed duct system. And that does not happen.

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Last edited by hvaclover; 12-19-2010 at 11:33 AM.
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Old 12-19-2010, 04:42 PM   #4
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Furnace supply temperature question


That temp is taken right at the bottom of the evaporate coil. When you say temp taken at the plenum to you mean 1-3 feet after the ducting begins? I hav a down draft setup
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Old 12-19-2010, 05:52 PM   #5
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Furnace supply temperature question


Ok drilled a hole at about 1 1/2-2f from the beginning of the ducting and got a temperature of 125 degrees
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