HI, I was hoping someone here could help with a suggestion on how to deal with this issue. About 4 feet of two of my second floor bedrooms overhangs our front patio. Both these rooms are freezing. I'm about to lay new hardwood and figured while I have the subfloor exposed I might as well lift up some of that plywood and insulate this section of the floor. Standing under those rooms on the patio I can see a vent on either side of the house. Not coming out of the side but straight down. I'm not sure why they are there or what purpose they serve or if they'll cause a proble once I insulate. Can I insulate this floor from above and is there anything to take into account given these vents are there? I REALLY don't want to go in through the bottom/outside. The house is 25 years old...not sure why they didn't insulate them to begin with. Any help or direction would be awesome!