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Matching furnace blower CFM to AC unit tonnage

2139 Views 7 Replies 3 Participants Last post by  user_12345a
Hello, I am wondering if someone with more knowledge of air conditioning systems can tell me if my situation is an issue or not. I am building a 32x40 finished room inside my 40x80 pole barn with 10 ft ceilings. I picked up a lightly used 80,000 BTU furnace with a 16,000 CFM blower. I now need to buy the AC unit. The problem is that based on the calculations I have done, the AC unit should be 2 ton or around 800 CFM for the evaporator coil. Will there be any drawbacks if twice that about of air is passing over the coil using the 16,000 CFM blower? Any advice would be greatly appreciated!
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There is no way an 80,000 BTU furnace can move 16,000 CFM.
That’s a huge furnace for such a little room. Huge amount of air conditioning as well.
What sizing calculations have you done?
That’s not any kind of load calculator. I tried it and it suggested my house needed 7 tons. Which I know for a fact is 3 tons too many.
Bigger equipment is not better.
Figure 350-400 CFM per ton.
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