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Hi: Your question is a good one and fairly easy to answer. Most systems are matched in their in general design critieria so that the air flow will be ample for both the size of the cooling design ( AND ) the heater air flow demand. Mix matched systems do exist but you should always use professional guidance before attempting one as that safety issues are prevailant. Mostly concerining adequate air flow. P.S. Typically heating systems use lower speed fan setting for heating application and faster for cooling. Some Mfg.s, simply use just the high speed for both. The design criteria specs. you would look for to make your decission would be C.F.M. per Minute per Pressure drop loses designed in the overall duct design. Hope this is helpful, Jimiwane

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Q: Does the heater coil and 3 ton AC coil have to be the same size?
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