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Question DetailsAsked on 5/29/2016

how big of an a/c unit do i need for 1350sqft in michigan

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Probably around a 3 ton unit, but depends a lot on your location - southern inland or southeasdt Michigan would generally be a higher demand than far northwoods/upper peninsula Michigan, and an area near the Great Lakes would generally be lower demand than inland - but it also depends on whether you are east or west of the lakes.

You need a Heating and A/C contractor (your Search the List category) to come to your place and run the ACCA Manual J and S calculations for your specific house - which determine the cooling load, and the unit sizing.

Then you can talk efficiency of the unit you want - minimum standard efficiency, or a higher efficiency for lower fuel bills but at higher initial cost. You might have several vendors quote both standard and high-efficiency units, then run through some energy cost calculations to determine which will pay back the best for you. My guess - unless in the hotter part of the state or needing pretty constant A/C for health reasons spring through fall, a high efficiency AC unit is not likely to be economic in your area, as opposed to a high efficiency furnace which might well be.

You can find a lot of prior responses on the efficiency versus energy savings payback issue in the previous answers in the Home > HVAC link in Browse Projects, at lower left. Of course, your electric rates factors into that decision, and potentially your electric system sizing because a higher efficiency unit MAY (not necessarily, depending on brand) pull less power and avoid having to upgrade your electrical system to handle the added load.

Answered 3 years ago by LCD

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