AC size calculator: what size unit do you need?

Estimate the air conditioning capacity your home needs based on square footage, sun exposure, and household size. Use this before getting quotes so you can spot undersized or oversized bids.

Recommended cooling capacity

41,000 - 50,500 BTU

This range shows the typical BTU capacity range installers would size for; an in-home load calculation (Manual J) gives the exact figure.

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This is an estimate; a contractor's in-home load calculation confirms the exact unit size needed.

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Your calculator inputs and estimate are included with your request so contractors can quote your specific job. Just add your location, when you need the work, and your contact info.

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When you submit a quote or contact form, your enquiry may be shared with partner providers who can do the work. We may receive a referral fee, but our rankings and scores are based only on our published scoring method and are never affected by referral payments.

Get quotes from top-rated hvac contractors

Ranked by our published rubric from recent Google reviews, weighted by relevance to this service (the same order as the category page).

Mountainside Air Conditioning Repair
5.0(592) 94
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Mountainside Air Conditioning Repair
5.0(152) 93
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Mario Bros Heating & Cooling
5.0(230) 94
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State Forty Eight Home Comfort LLC
5.0(196) 92
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AZ Home Services Group AC Repair & Plumbing Services
5.0(1485) 92
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