Heat pumps are nothing new. They are not wide spread for a reason. It's weird how old ideas get a new life over and over again. My pet peeve is that these ideas

Heat pumps are nothing new. They are not wide spread for a reason. It's weird how old ideas get a new life over and over again. My pet peeve is that these ideas are presented in an overly simplistic way that simply aren't true. "Did you know that you can get free electricity by simply installing solar panels on your roof?" Or "Cut your utility bill 50% by harnessing the power of wind". We know about heat pumps for 100 years. There's a reason why most heaters use gas or electricity - it's cheaper and more simple in installation. There are a lot of enthusiasts who can do things well with their own hands, including sourcing materials, so it's really cheap and simple FOR THOSE FOLKS. But for regular folks these things tend to cost more even for totally proven and technically viable technologies - solar, heat pumps, passive house, water harvesting, etc.