Owning one and having a model plane engine set up with the same care and attention to heat management are two completely different things. How many of your planes have a tighly shrouded engine, encompassing the entire engine assembly, that best manages heat? My guess is none.

Yes, a model engine can run as well in cold air as in warm, but attention to detail is critical. Breaking in an engine in cold air is even more critical since little of the engine is mated correctly when you first start it. You have to know a little more about what makes an engine work and how they work than just flipping a prop and running the throttle up and down.