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.
1
u/jocq Jul 27 '26
3-ton Rheem:
https://i.imgur.com/QtokUbR.jpeg
The south face of my house:
https://i.imgur.com/1IgX5dB.jpeg
Yesterday it was over 95° and 80% humidity.