I made a small window today in plastic to stop heat from escaping through the storm window while the plane sits in the hangar with electrical cabin heat. Temperatures are going down these days. Worked pritty nice actually. Cost was 29,90 NOK + some superglue! Window is removable and allows for an electrical cable to pass through and keeps the warm air inside!
I have E-Z Heat pads installed in the bottom of the oil sump on each engine. When they are connected to ground power, I send an SMS to the plane and engines start warming up. 1,5 hours before starting is sufficient and makes the engines start easily.
