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High Efficiency gas furnace - return air temperature
The unit in question is Goodman GMV9509050XBA gas furnace (95% eff.,
90,000 BTU.) It says in the Installation Instructions (page 7, Location Requirements & Considerations) that the following must be observed: "The temperature of the return air entering the furnace is between 55F and 100F when the furnace is heating." I am curious why the 55F requirement. I mean, when I'm not in the house, I would like to set the temp as low as possible in order to save on my heating bill. I think I could otherwise set it as low as 45-50F and still keep the water pipes from freezing. But I wonder why I'm not supposed to go below 55F. What could happen? Could the unit get damaged and why? Thanks P.S. I'm in the Denver, CO area - 5,300 ft altitude, if that matters. |
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