“Heat pumps have outdoor temp problems “
Cold Weather Performance
Standard Models: May rely on backup heat (like electric strips or a furnace) below 25-30°F.
Cold-Climate Models (e.g., ENERGY STAR): Must work effectively at 5°F and maintain significant capacity (e.g., 70%+) at 5°F to qualify.
Hyper-Heating (H2i): Can provide 100% heating capacity down to 5°F, with guaranteed operation to -13°F or even -5°F (H2i Plus).
https://www.google.com/search?q=modern+heat+pump+temperature+range
Heat pumps do work, but the one I had installed cost... are you sitting down? $27,000. Heat pumps may be more efficient than electric baseboard, but my cost per KWH is 24 cents, I won’t save money for about 500 years.