Hello. First, some background info. This is my first winter in a home with an electric heat pump so I'm very new to this. I live in MD and it has been as cold at 10 degrees recently. My heat pump has been blowing what feels like cold air for days. After doing research, I am beginning to understand that this is normal and that it's not truly 'cold' air. I usually keep my thermostat set to 67 degrees. I have noticed that when I turn it up to 70 or more that I get warm air out of the vents and my house actually heats up. If I leave it at 67 all the time it seems that my heat pump is running constantly and my thermostat says that it's 65 to 66 and it never seems to warm up. Is there something wrong?