A Heat Pump "costs" more. A Heat Pump has more parts that can break. A Heat Pump operates at much higher pressure in reverse causing wear/tear on compressor and using more power and many times causing freon leaks at fittings.
A Heat Pump does have higher efficiency over conventional system but does that outweigh everything I mentioned prior?? And it will take you years for that better efficiency to pay for the added initial costs/repairs, etc.
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