I appreciate your attention to accuracy in this discussion. I think we are basically arguing against different oversimplifications, not really disagreeing about

I appreciate your attention to accuracy in this discussion. I think we are basically arguing against different oversimplifications, not really disagreeing about anything fundamental. My own house was built with hydronic floor heating, via natural gas. We added a ductless heat pump a few years ago, but we primarily use it for cooling. It would be a clear win from an environmental perspective, since our utility is 80% hydro and 0% coal/oil/gas; but the radiant floors are so much more comfortable that we haven't made much use of electric heating yet. We'll probably have the heat pump upgraded in a year or two, to cover more of the house; perhaps that'll be a good moment to shift our habits and see how it works out.