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The necessary size (or horsepower) of the pump can be determined by the following general rule-for above ground pools up to 24 ft round, use a 1 HP pump and for above ground pools over 24 ft round, use a 1.5 HP pump.
Heat pumps range in size from 50K Btu's up to 150K Btus's. For an average inground pool, 100 Btus's may be a good size, with larger units for shady pools, large pools, or high wind areas. The cost to buy an inground pool heat pump is $2500-$3500. Cost of Pool Heat Pump Installation? Installing a pool heat pump involves placing the unit on a heavy pad or slab, and plumbing the pool return pipe in and out of the unit.