Room area (sq ft)
Climate zone
Zone 1 (Hot/Humid - e.g. FL, HI, South TX)
Zone 2 (Warm - e.g. GA, AL, AZ, TX)
Zone 3 (Moderate Warm - e.g. NC, AR, OK)
Zone 4 (Mixed - e.g. VA, KY, MO, KS)
Zone 5 (Moderate Cold - e.g. NY, PA, IL, CO)
Zone 6 (Cold - e.g. ME, MI, WI, MT)
Zone 7 (Very Cold - e.g. ND, MN, Northern ME)
Insulation
Poor (Older home, drafty)
Average (Standard code built)
Excellent (Spray foam, modern airtight)
8,000
BTU/hr
1.5 ton central AC · 9,000 BTU mini-split
Zone 4, average insulation, 2 occupants
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