I have a 1-year old GOODMAN 2.5 Ton, 13 SEER Heat Pump. When the weather gets too cold outside it blows cold air when it's on the heat mode. It seems to keep blowing cold air until the house drops a degree below the indoor thermastat setting. Then it will turn the auxillary heat on until the house warms up to the correct temperature. Then instead of turning the whole unit off, it will only turn the auxillary heat off and start blowing cold air again. And the cycle continues on and on for about an hour before it turns off.
The heat works fine when it's not too cold outside.
I usually set the heat on 72-74 degrees and today its 10 degrees F outside.
Is this normal for Goodman heat pumps? also, do Goodman heat pumps come with a external thermostat includded or is that what I need to have installed to stop the cold air?
Thanks for the help!