[Eridrus]

I wonder, how "compatible" this is with solar.

I.e. if you install solar by itself, you save X dollars/month. If you install this by itself, you save Y dollars a month. If you install both, is it close to X+Y, or is there some substitution there?

On one hand, you can sell solar back to the grid, but you can't always sell it back at retail, so I would guess your savings would be smaller, but how much smaller? Or would you be able to achieve the same ROI with a smaller rooftop solar installation?

TBH, I'm not really a big fan of rooftop solar, it seems like a hack to deal with shitty environmental policy that undermines the electricity grid itself.

[dsr_]

Depends on how you heat.

If you live in a climate where you need to heat in the winter and cool in the summer, ground source heat pump are cheaper to operate than oil, gas and A/C. Solar will contribute to reducing your A/C electricity bills and also all the other power you use year-long, so they work together.

If you live in a climate where you occasionally turn on an electric heater for those really cold days, this will only help during cooling season, while solar will contribute all year long.