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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?

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    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
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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

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