I live in a single story house built in the 1920's that is approximately 1500 square feet. It's elevated, on blocks, about 3 feet from the ground and the AC/Heating ducts run beneath the house, with vents opening in the floor. Currently, I have metal ducts running beneath the house. I'm not sure how old they are, but I do know they are leaking air because the crawl space beneath my house is very cool and conditioned, while the inside of my house doesn't drop below 80 degrees (it's over 90 outside here in lower Alabama right now) in the summer (it also doesn't warm in the winter).
I've noticed the current metal ducts running beneath the house have several holes throughout, some that are big enough that a cat climbed inside recently (and then pushed through a vent and into the house). Also, the ducts are not wrapped in any insulation at all.
I have a few questions: First, should the ducts be removed and replaced? Or just repaired and wrapped in insulation? Second, if they should be replaced... should I go with duct board or metal ducts?
I've received a couple different quotes. The metal duct was about 4x the cost of duct board. However, I've read a lot here at this site about the pros of metal duct vs the cons of duct board, so I'm a bit reluctant to go with duct board. But, I'm also wondering if metal ducts are truly worth spending 4x the cost of duct board?