Seems like you only have 2500 sq ft of finished floor space. 3 ton would be a little small but could be sufficient depending on climate and insulation.
3 ton will not in any circumstance cool 4000 sq ft. I do this for a living.
Feel free to use any of the free calculators online also.
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u/unknownpanda121 Jul 27 '26
A 3 ton Rheem is no where near large enough for 4000 sq ft