Regardless of mounting style, you are on the right track with a heat pump vs. normal a/c unit. I used a 15,000 btu Carrier roof heat pump in our trailer instead of the normal 13,500btu a/c that you usually see. It was not that much more than an a/c unit, and you get full heat output out of it instead of just cooling. The heat strips in a std. a/c unit are entirely useless, but this works quite well. We've had this on working well with days into the 90's, and sometimes nights into the 40's and it keeps up just fine. A basement heat pump makes sense for the same reasons. One unit for heat and cool.
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