Quote:
Originally posted by turbo6bar
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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Too cold out today to get any temps off the units. My crawl space is ~900sq ft by 4 feet high with 4 10"x 20" vents. The vents are already open year round but it still maintains 50 degrees under there. I have 10" insulation under the floor. I wonder how quick it might drop to ambient under there if I tried that. Or would the thermals of the ground (dirt) keep up? It's looking more like no free lunch.