Well glad I don't work in Q8.
Here in ARN is a strict no APU policy.FEP is plugged in on arrival, and the APU goes off. Restart 5 mins before departure. In fact the MH B744 crews have now been trained to not start the APU on landing. We plug in two FEP, and he shuts down nbr 4. APU started when pax door closes. We have ground air supply on most stands, and of course a nice climate. It makes life on the ramp so much easier when you don't have to shout to each other.
By the way, aircraft take a long time to cool down in the cold. Leave an empty aircraft with the power on, and even at M10degC it keeps warm (until catering opens the doors!)