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Re:Homemade Heat Pump Manifesto (2009) by emj on Saturday September 24, 2022 @04:44PM (#32966399)
It is explained like this in the thread.

> if you have a large compressor, you pay more for it with every revolution the trick is to figure the maximum BTUs or watts you will need, and design a little bit smaller. Plan to use a supplimental energy source to fill in during extreme conditions.

Worth noting the AC_Hacker paid $25 for the AC he used for this.

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