greater detail. the most important, it is repplrep pl reppl repplicable and it s being done in new york city and other areas. give us a couple. the first thing interestingly enough we retro-fitted 6,014 windows. took them apart, washed them, never left the building, reused 90% of frames and glass and took them to r-8 with the insertion of a mylar sheet. explain. air is r zero, all transfers of energy and efficiency. r 2 is better than r 1 but not as good as r 8. by changing out these windows, you re keeping the heat inside, in the summer, you re keeping the air-conditioning inside and because of that that s right.