For those who have asked about the effectiveness of the standard KF heater (the one that works of the coolant lines). We flew today with OATs of 0deg f, heater took the chill off but definitely needed jackets. I have a cloth barrier to the back which keeps the cold air off my neck. With a basic winter jacket and thin driving gloves I could have flown all day.
Beautiful flying today, my son got some nice pics of a fox crossing a snow covered lake, stopped by and met CainBird (nice hangar he built himself). All in all a good day.