Related heatpump info for the DIY crowd: Homemade Heat Pump Manifesto (2009) [1]. Although factors such as extreme cold-weather performance will be compromised, the lower cash outlay confers considerable appeal to this approach.
> My initial goal was to make available the knowledge and possibility that anybody with a few tools and gumption could convert discarded air conditioners, and dehumidifiers into very high efficiency heat sources, or cooling sources. Through the years, we have received reports of success from many people, living in many states, and countries.
> My initial goal was to make available the knowledge and possibility that anybody with a few tools and gumption could convert discarded air conditioners, and dehumidifiers into very high efficiency heat sources, or cooling sources. Through the years, we have received reports of success from many people, living in many states, and countries.
[1] https://news.ycombinator.com/item?id=32959850