I have tried to get information on this by searching internet without success, hope someone might be able to help!
Our home was built in 1904.
We have restored original wood floor for ground floor. However, some drafts/ chill air come from unheated basement beneath. We thought that putting insulation in basement ceiling between wood joists, might help with the drafts and possibly save a little in heating (because rooms above basement might retain heat better from our forced air furnace).
HOWEVER - would the insulation make the room warmer in summer? We use a window a/c in the hottest part of summer. But I assume that cooler air in basement below might also keep room a little cooler than it would be otherwise. But insulating basement ceiling would keep that cool air from rising. Would it result in warmer room and more air conditioning energy expense in summer?
If you have any relevant knowledge to share we'd be very grateful!