tank still has plenty of propane left. When you refill your own tank, you know that the tank is not abused and you keep it upright. OPD valves (overfill prevention device) have a float inside the tank. When tanks are dropped, thrown around or transported/storred on their sides, damage...
This is true even if the heat pump has to rely on an electric-resistance strip heater for backup from time to time. If it’s replacing expensive heating fuel like propane, “regular” electric resistance, or sometimes oil, a heat pump will cost less to operate. It may or may not cost...