Heat pump blowing cold in heat mode could mean defrost trouble, low refrigerant, or a stuck reversing valve

https://andersonnnmg208.huicopper.com/emergency-hvac-repair-in-alpharetta-when-to-call-right-away-and-what-to-expect

Heat pump blowing cold in heat mode could mean defrost trouble, low refrigerant, or a stuck reversing valve. Don’t wait—quick diagnostics in Alpharetta can spare you higher bills and longer run times.