I know the issue is over now for the OP.
But it's worth noting that so long as the dragon doesn't freeze solid during the extended power outage , even 2 or 4 days of no heat is not going to harm the dragon , it'll simply slow it's metabolism down to just ticking over while cold and sleep through the outage.
We lost power for a week during a monster winter "cyclone", was a bad enough storm to ship wreck a 300,000 T bulk coal ship on a reef about 300m from a local beach and about the same distance from Nobby's Wall (crew was rescued by ADF helicopters when the ship looked like breaking up in the 20m + storm waves) , and it blew down many trees and lots of power lines in my region , temperatures fell to about 5 degC inside our home ( is all electric so no heating ) , my bluetongues and dragons simply slept through the event , and were up and wide awake within a couple of hours after the power was reestablished , they suffered no ill effects at all as far as I could tell .