I don't know if there's currently a solution for spas that incorporates a heat pump - Purdue has a paper on it [1] - my point was more that incorporating a fals

I don't know if there's currently a solution for spas that incorporates a heat pump - Purdue has a paper on it [1] - my point was more that incorporating a false economic signal allows maintaining the status quo instead of leading to improvement in efficiency. [1] > I don't think it was a gimmick anyways - they were doing this for a long time non-publicly before it came out and when it did a lot of people said they no longer wanted to be customers. Seems plausible. [1] https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2932&context=iracc https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2932...