Replacing 24-year-old Noisy Furnace--Looking for Advice

[beenthere]

Thanks for the help. How many tons would that (80K) be? (Current BTUS on furnace is 162,000, it's 24 years old.)

The reason I didn't go with the proposal I received is two contractors told me I could go quite a bit smaller, one told me I could probably go about 3.5 tons. (Unfortunately, he never got me a bid.)

Depending on brand, it can be 3, or 4, tons.