We got down into the 30's this morning so I decided to run a quick test of the heat pump function on the Turbro. After using it down into the 20's while camping over New Year's I already knew it performed well but wanted to put some stats to it.
Starting cabin temp was 37.2 when the heat was first turned on. The unit takes about 3 min to actually start producing heat, which most likely to get the evaporator up to operating temp and prevent circulating cold air. Once the heating started, the outlet temps at the duct immediately went to up 114 and peaked at 118 which was much higher than I expected... Took a little over 15 min to get the cabin 10 degrees warmer but from there the temperature warmed quickly and got to setpoint of 67 in a total of 38 min. I left the setpoint alone for 15 min to see if there would be any fluctuations in temps from cycling, but it held steady the whole time. After this I bumped the thermostat up to max and within 8 min the cabin temp was 75 degrees. Ended testing there since we'll never have the heat set that high, though it's nice to know it can get there and probably even higher.
It may have some issues, but heating performance isn't one of them!