[QUOTE=AC_Hacker;33733] Well, it's less like cooking from scratch than it is like cooking from prepared ingredients, since we start with a used air conditioner or de-humidifier, and the compressor and the cap tube or Temperature Control Valve (TXV) is already matched, so most of the tough engineering has already been done.
Ah, well, seems to me that's rather like cooking from scratch for most folks. I may grow, harvest, thresh and grind my own wheat in our garden patch out back for the bread we eat, but I haven't taken to evaporating sea water for the salt or making my own yeast. "From scratch" is a pretty blurry concept, I think, so I'll continue to think of you as making heat pumps from scratch.
Except for three small rooms, our entire home is open all the time, so the heated zone is actually heating about 1700 SF and doing alright, but I hear what you're saying.
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