I found that the better quality gyro's are less affected by the temperature change between 30-50 degrees (Futaba, Hitec, CY, etc).

Was out flying Tuesday night, temp was in the lower 30's. The GY401 was fine out of the house into the cooler air, rock solid. My buddy uses a Curtis Youngblood gyro on his Raptor 90, he subjects his to the warm/cold shock as well without any issues. However the Telebee gyro had some HH issues when subjected to the same treatment as the GY401. Haven't flown the "FrankenAXE CPv1" in a couple months, having too much fun with the 500!

Rick