I live on the 4th floor of a condo with a 20 year Carrier 50Qt through the wall electric heat pump. There is a louvered door to the closet. The problem is that the closet is real drafty - cold air leaks into the living room right through the louvered door. I've tried to seal around the wall sleeve as much as I can inside the closet, but I'm wondering if I can replace the louvered door with a regular door or cover the bottom louvers and put a draft stopper to keep the drafts in the closet and keep the cold from leaking in. If I did this would I be affecting the performance of the heat pump? Am I not considering return-air? There is a filter at the bottom of the heat pump that I replace on a monthly basis. There are no other appliances in this closet.
Thanks in advance.