My
Scamp is 2004 and I just looked at it from the cabinet on the left side. I saw a round, about 3 inch "punch-out" that I think is what you refer to. I am pretty sure the outer, thin sheet metal box does not get very warm. If you have kept that punch out, tape it back in place with duct tape. Otherwise I would expect that the cabinet will get more heat from the furnace and the living space will get less. To be sure, check on the temperature when you are spring camping, or while still at home.