Hey there, So I think i know the answer to this but want some 2nd opinion. I studied and read that its 1cfm/1ton of cooling. My house im building is 1720sq ft. So therefore initally i would think at 400cfm/ton that i would need about 4.5 ton heatpump, however I also read that a 3ton system will work fine for a 1500-1800 sq ft home. What am i missing in the clarity of this. Thanks for all insight. Wes
source https://hvac-talk.com/vbb/threads/2242248-duct-sizing-question?goto=newpost
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