[idlewild]

Originally Posted by jrref

Generally, you need 20 BTU for every square foot of space in your home. The chart below can guide your BTU choice:

Home Square Footage BTU (British Thermal Unit) Tonnage
600 – 1,000 18,000 1.5
1,000 – 1,300 24,000 2
1,300 – 1,600 30,000 2.5
1,600 – 1,900 36,000 3
1,900 – 2,200 42,000 3.5
2,200 – 2,600 48,000 4
2,600 – 3,200 60,000 5
The larger your home, the higher BTU you’ll need to support your comfort. One of the most accurate ways to measure the right size AC for your home is with a Manual J calculation.

So you AC is sized correctly.

We're at 1967 sq feet which is 3.5 tons according to your chart. It would likely strain if we added another 300 square feet (the lanai space) for a total of 2267 which is 4 tons according to this chart.

That stated, I went to the site you referenced and it seems the year of construction (2025) is weighs more heavily than our post code (34762) so it does indeed recommend a 3 ton.