Dear Ken: Is it OK to close off heat registers in the winter? If so, how many? What about in the summer when we air condition? Also, we were advised that it's OK to block the cold air return in the basement. What's your opinion on all of this? Brenda
You need to be careful. If in the winter you starve the furnace of its required air, you risk overheating it and shortening its life. In the summer, the result can be a freeze-up of the evaporator coils (the ones on top of the furnace...