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Can you replace a 20-yr old Unico system with a Spacepak
My 20-yr old Unico high velocity system needs to be replaced. I was able to get two quotes for replacing the system with a new high-velocity system. The first contractor said that I had to replace with a Unico. The second contractor said it was no problem to replace with Spacepak, and they prefer that system. Also, I had good experience with a Spacepak installation in my previous house, and I have little experience with Unico.
So is it possible to replace the system (reusing the ducts), or was the first contractor right?