Unproven and marketing hype. This technology is also not able to heat/cool apartment buildings which as you know cities are comprised of in the most population dense areas.
Needless to say that the expense of purchasing, installing and maintaining these is out of reach for most people and they will never recoup those costs in savings.
Maybe if the technology improves and becomes more affordable in the future like other things it could work, for houses but years away from that and not a solution to replace natural gas heating.
Here's a though, maybe reduce our taxes so people could afford EV's and heat pumps and that will encourage progress in the technology?
