“Sure, heat pumps work great and are efficient.... when the temperature is above 40. Go below 40 and heat pumps lose efficiency. Heating your house with a luke warm hair dryer...no thanks!”
Most systems have backup strip heaters. Were you too cheap to get them?
If heat pumps are so great, then why the need for a backup system? Backup strip heaters literally are hair dryers heating your home. If you are in Texas, you don’t know what real winter is so I’m sure they’ll work for you. In the real world of real winters I’ll stick with real heat :)