Oh and sometime with a hair drier the belly of the rat stays cool so it is warm enough for a few moments but then cools off. I like to thaw mine in the fridge over night than a few hours at room temp then 20 min of a heating pad (human) to get the core of the rats warm then hair drier to add extra to the head. Warming a cold rat with a hair drier may only heat the surface and not the belly and it cools off quickly.

MAKE sure the whole rat is warm. (warm not cooked) It is a bit inconvenient but in my situation less than live rats hanging around.