Hello everyone. I am new to this. I am looking to buy a new AC/Heater unit for my town home. The town home was built in 1979 and the ducts are on the roof exposed to the sun but are sealed. I had a guy give me a quote for a 4 ton unit but said that I should replace my ducts since I am going to a bigger unit. I have a 3 ton now.
My question is should I replace the ones on the roof or just leave the ones I have???
I had 2 quotes saying not to change them and 2 said to change them.