Most homes are losing energy dollars everyday in a place few of us give much thought. The air ducts in our heating and air-conditioning systems. But do-it-yourselfers can do something about it.

Steve Easley (Energy Consultant): What we do is, we take some mastic sealant, and we just kind of brush that on there. Put the mastic on there, a liberal application of mastic sealant.

Al Carrell: Now we need to slip this on here.

SE: Real important that the inner lining of this duct work actually goes all the way up against the edge of this boot.

AC: Like it is right now.

SE: Absolutely. It's not a bad idea to put some more mastic on there. Don't be afraid to use a liberal coating of this mastic sealant. This is called a flexible duct tie, and what we're going to do is, we're going to take our clamping tool, and if you pull it up good and tight, and then you use this device here and it snaps it off. The next thing we'll do is we'll pull that insulation over the top of the duct, pull the foil liner over that. And in hot attics, it's always a great idea to use a foil-covered insulation flex duct, because it will reflect about 90% of the heat from the hot summer sun that radiates from the roof deck into the attic. Wrap this around the foil insulation, pull it up tight and what you have is a good, solid connection that's not going not going to come loose in a few years.

AC: And that means you're going to save money year after year.

I'm Super Handyman Al Carrell, About The House.