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Gas furnace with 3" exhaust vent
I am replacing my central A/C and heating. I have a gas furnace with a 3" exhaust vent, it is a very old unit. I am being told that all new units have 4" vents and changing my vent all the way out the roof requires a lot of tearing out sheetrock and replacing it. I can go with electric heat but I do not have the correct wire and it would cost $1,200 to get the correct size wire. Does anyone know of a manufacturer that still makes a gas heating unit with a 3" vent? My A/C man says he has looked everywhere and cannot find one. Just checking before I spent money on the sheetrock or running the wire needed. I am in USA, Texas. Thanks