Closing off duct work
We have a system that is about 350 sq. ft too small for our house. We have lots of 98 degree days or more and it just doesnt keep up. We have gotten a few estimates but it is a 10000 or more change. One guy suggested we close off the duct work that supplies our finished room over the garage because the duct work is too big for it anyway an we have to use a window unit to cool it anyway, but he didn't say how to do it. Anyone k ow what that entails ?