It's not hard nor inherently expensive tech. The difficulty for adoption in the US is that it's positioned as a premium product, with very few vendors of equipm

It's not hard nor inherently expensive tech. The difficulty for adoption in the US is that it's positioned as a premium product, with very few vendors of equipment, very few qualified installers, low market adoption (with all the resulting service and parts availability and latency concerns that come with that). In a location with $0.25/kWh electricity, $1.91/therm gas, and ~9%/yr cost of capital, the payback period is literally never.