We had terrible air flow to the second floor of my home which caused hot and cold rooms. The house is approximately 2800 sq foot. I have 1 Duct system in My basement and the air flow wasn’t strong enough to push it that far. After endless research we found Aeroseal. When they did my test I was at 700 cfms of air loss. After completion it was 23 cfms which was a 97% reduction according the to sealing report. The air flow to my second floor is amazing now.