I'm new on here. My house was built in 1979 about 1700sft. My A/C ( Carrier, 2 ton, made in 1983 ) is not working. My furnace ( Clare, original with the house) is working fine. But it is a belt-drive blower. I need a new AC. Should I replace my furnace as well? If I replace the AC, will the belt-drive blower working fine with the new AC? Please help or any advice will appreciated.