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Unconstitutional Patriot
Join Date: Apr 2000
Location: volunteer state
Posts: 5,620
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tdatk, the HVAC mentor tells me it's a real fight when temps get down to 25 degrees. Shield the condenser from strong winds. Try to get any sunlight on the unit. When mercury drops below, turn on electric heat. The is only so much you can do before thermodynamic forces win.
I think the crawlspace make-up air would certainly help, but at some point you may start pulling heat through the floor of the house. After all, if you reduce the temp in the crawlspace, you increase heat transfer through floor.
What is the temp of the coil pre and post compressor?
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