I would agree with jg96, we have a small greenhouse heater in the garage where we have a fridge freezer. It's just to take the chill out of the air as we had a problem withour freezer a couple of years ago and even got as far as ordering a new one. A few days later the weather warmed up a bit and it started working again. It's been fine since we've had the heater it only clicks in when the temp drops really low and we recon the few pence a day it costs to run far outweighs the costs of restocking a full freezer.