AC Size Calculator: What Size AC Do I Need?

Home size 1,500 sq ft

Adjustments

Lots of direct sun or west-facing High or vaulted ceilings Older home or poor insulation

Estimated size

3 tons

36,000 BTU per hour

See system options

Quick reference by square footage

Typical sizing for South Florida. Sun, ceilings, insulation, and windows can move this up or down.

Home size	Typical AC size	BTU per hour
Up to 600 sq ft	1.5 tons	18,000
600 to 1,000 sq ft	2 tons	24,000
1,000 to 1,400 sq ft	2.5 tons	30,000
1,400 to 1,800 sq ft	3 tons	36,000
1,800 to 2,200 sq ft	3.5 tons	42,000
2,200 to 2,600 sq ft	4 tons	48,000
2,600 to 3,200 sq ft	5 tons	60,000

Estimate only. This sizing is a starting point, not a binding quote. The correct size and system for your home require an in-home evaluation and a load calculation that accounts for your ductwork, insulation, windows, and layout. Proper sizing and application matter, and an estimate alone should not be used to purchase equipment.

AC sizing FAQ

What size AC do I need for my house?

In South Florida, a rough rule is one ton of cooling per 400 to 600 square feet, adjusted for ceiling height, sun, and insulation. A 1,500 square foot home is often around 3 tons. A Manual J load calculation confirms the exact size.

Is a bigger AC better?

No. An oversized AC short-cycles, leaves your home humid, and wears out faster. Correct sizing is more comfortable and more efficient than going bigger.

How many square feet does a 3 ton AC cool?

In our climate a 3 ton system typically suits roughly 1,400 to 1,800 square feet, depending on sun exposure, ceilings, and insulation.

Get the exact size and price.

Schedule a free on-site assessment and we will size your system the right way and show you the options.

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What size AC do I need?

Quick reference by square footage

AC sizing FAQ

Get the exact size and price.