[Chad C. Mulligan]

....When you get close to freezing outdoors heatpumps fall back on resistance heat. Wherrr goes the meter

In Texas a year or two ago thousands and thousands of heat pumps switched to resistance at once, and dowwwn went the grid.

[Texas Fossil]

Yes. I can see that happening.

I have NG heat in town. LP heat at the farm.

My brother had straight heat pump, he froze all winter. And still had a high bill.

For a long time where I live, we used Evaporative air conditioning at the farm. Even before Evaporative coolers, they had exhaust fans in central hallway and saturated cooling pads on the windows.It cooled the house and kept the attic cooler. Worked very well. They later added an exhaust fan to make it better.