I have had my house for 32 years. Its 45 years old, and the ducking was shot. bought new AC two years ago, and always felt it should be blowing better. had to go to attic on a hot summer day, and it was cooler up there then the house was. Old ducting full of holes. They came in with a fair price to re-duct entire house. Did it all in about 6 hours, and I couldn't be happier.