This is an air conditioning question:

Must a 4 ton variable speed air handler use a 4 ton heat pump or can a 3.5 ton heat pump or smaller size heat pump be used instead?

  • 1
    This sounds like a homework question. – Tester101 Nov 13 '17 at 3:59
  • Thanks Tester. Just asking the question for my dad who is trying to fix his home following weather damage. Simply looking for some guidance to make sure he isn’t buying a more expensive heat pump than is needed. – Andrei Nov 13 '17 at 6:38

The question you ask about a "4-ton air-handler" is that you can expect the air-handler to produce enough air supply to support a 4 ton A/C unit requiring about 1600 cfm. The actual air flow is dependent upon the total resistance to air flow in the whole system. Since the motor supplied is a variable speed or more probably a 4 speed motor, then you could utilize a lower speed for a reduced air flow. The actual air flow needed to support an A/C unit is not an exact science but is an approximation of the air flow needed. So, to answer your question "yes", you can use that air-handler on an A/C unit smaller than 4 ton. The 4-ton is the maximum size A/C you should use

  • I agree can't go smaller but larger will work. – Ed Beal Nov 13 '17 at 13:58
  • the 4 ton air-handler will work on a maximum 4 ton A/C. It will also work on units somewhat smaller than 4 ton. You said 3.5 ton and I say "no problem". – d.george Nov 13 '17 at 18:00

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.