Bought a new house taking 6 hours to rise 2 degrees, no heat pump wire

I just bought this house and been monitoring the heating system and some days it will run for a full 24 hours. And the air coming out is as I can only describe as luke warm. I checked the wires to the thermostat and it only has 5, no orange heat pump wire. The Unit outside is a Goodman GSZ140361LC and it seems to in fact be a heat pump. I just want to know what my options are as I’m worried the forced air running for 24 hours is going to cost a fortune.