We are talking about a heat pump, it doesn,t create, destroy, amplify, magnify, concentrate or otherwise pull heat from the ether.
It's only purpose in life is to move heat from one place to another.
In your case it is pumping heat from inside the house and blowing it back inside the house for a gain of nothing.
Some chilled air gets blown outside, so long as this chilled air is colder than the outside air that infiltrates the house there will be a net heat gain.
Once the outside air temperature drops to equal the temperature of the outlet duct the gain will be nothing.
When the outside temperature is below the outlet duct temperature you will be pumping heat out of the house.
Virtually all of the electric consumed will degrade into heat and end up in the house.
What you need to test is what is the temperature of the outlet hose when the device is sat in a room at the temperature you maintain during the winter.
As the only gain is the temperature difference between the outlet duct air and the external air this is where your answers are.
Steve
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