Some heat pump notes:
If sized and operated properly they are very efficient. One of the biggest issues is they are often too big for the space they are heating/cooling. They are at their best when they run steadily to maintain a set temperature. If they are too big they cycle off and on and waste power.
Heat pumps are not all created equal and you get what you pay for. Japanese brands are the best. Bargain heat pumps aren't worth the price.
You will need a professional to do an energy audit on your home to properly size the pump. Your information from your solar audit should be transferable.
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