Fair enough, but direct heating of the environment is not of practical concern since it's effect is minuscule compared to GHG's. Point being, solar output is we

Fair enough, but direct heating of the environment is not of practical concern since it's effect is minuscule compared to GHG's. Point being, solar output is well correlated with A/C usage, which is a nice benefit and all that solar energy would be turned to heat anyway... so might as well have it cool your house :) Heat pump in the winter on the other hand, not so well correlated with renewables.