My Aerotemp heat pump will only raise the pool temperature a few degrees per day, so it takes several days at the beginning of the year to get the pool warm enough to swim. My friend's propane heater raises his pool temp 2 degrees per hour. If I had it to do over again, I would get propane rather than a heat pump. The propane heater was also less expensive. A heat pump may be cheaper to operate, but I need to run it constantly, so I have doubts.
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