Heidi: Welcome back to our continuing effort to make Al's place energy efficient.
Tim: Thank you, Heidi. We now give you... [fanfare plays]
Tim & Al: The board door!
Al: Now, a board door is the most effective way to detect air leaks in your home.
Tim: It does that by creating a vacuum inside the house, pulling outside air through any cracks and openings.
Al: And since you can't see air...
Tim: Unless you live in Los Angeles. [chuckles] Oh, that's not pollution, that's a marine layer!