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The old one also sounds like a running lawnmower, but still.
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this post was submitted on 03 Sep 2023
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We need to figure out how to retrofit those old machines to be as efficient as the new ones, and be clean and pigeon free. Then we can keep them around.
Is there any reason a window unit couldn’t be a heat pump? My understanding is the difference is just about a single valve to reverse the direction of the coolant.
I thought it was just that it was too difficult to fit all the parts efficiently in such a small box
When Tesla first publicized 3d printing the “octovalve” as a piece to complex to manufacture traditionally, the claim was that it made the heat pump much more compact. There was even a rumor going around that they might use it to enter the home heat pump market. Their work in making heat pumps compact enough for cars could really make a difference, however I image home stuff is much more price sensitive
Mini-splits do exist in window-mountable form, although they haven't really caught on (yet). Technology Connections covers alternatives like that at the end of his portable ac episode https://youtu.be/_-mBeYC2KGc
Uhh, old style is heat pump too. Unlesz you are referring water evaporation.
The difficulty (just looking at the refrigerant) is the huge differences in pressure needed between refrigerants.
Then you have to look at the compatibility of the compressor motor oils and the refrigerant.
One example
Others:
Makes sense. Very different tolerances and tooling required