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A certified HVAC contractor performs a Manual J load calculation for exact sizing.
Get Free Quotes| Tonnage | Home Size (FL) | BTU/hr | Installed Cost (est.) |
|---|---|---|---|
| 1.5 Ton | 600 – 1,000 sq ft | 18,000 BTU | $2,800 – $4,200 |
| 2 Ton | 1,000 – 1,400 sq ft | 24,000 BTU | $3,200 – $5,000 |
| 2.5 Ton | 1,400 – 1,800 sq ft | 30,000 BTU | $3,600 – $5,800 |
| 3 Ton | 1,800 – 2,200 sq ft | 36,000 BTU | $4,000 – $6,500 |
| 3.5 Ton | 2,200 – 2,800 sq ft | 42,000 BTU | $4,500 – $7,200 |
| 4 Ton | 2,800 – 3,600 sq ft | 48,000 BTU | $5,000 – $8,500 |
| 5 Ton | 3,600 – 4,500 sq ft | 60,000 BTU | $5,800 – $10,000 |
A general starting point for a 2,000 sq ft Florida home is 3 tons (36,000 BTU). However, this can vary from 2.5 to 3.5 tons depending on ceiling height, insulation quality, window area, sun exposure, and which part of Florida you're in. South Florida homes typically need slightly more capacity than identical homes in Central or North Florida. Always require a Manual J calculation for the exact answer.
No — oversizing is actually worse than slight undersizing in Florida. An oversized AC cools the space quickly then shuts off, never running long enough to properly remove humidity. In Florida's 75–85% relative humidity, this leaves your home feeling clammy and damp even at the correct temperature. Oversizing also causes more wear through constant start/stop cycling. The right-sized system runs in longer, smooth cycles that properly dehumidify your home.
Signs your AC may be oversized: home reaches temperature quickly but feels humid, AC cycles on and off every 5–10 minutes, you hear the system starting and stopping frequently, home feels clammy. Signs of undersizing: AC runs almost constantly without reaching setpoint on hot days, some rooms never get comfortable, system struggles during afternoon peak heat (2–5 PM). Both scenarios benefit from a proper Manual J sizing evaluation.
One ton of AC capacity equals 12,000 BTU/hr of cooling. The term "ton" comes from the amount of heat needed to melt one ton of ice in 24 hours. Residential AC systems in Florida typically range from 1.5 to 5 tons. Most Florida homes between 1,800–2,200 sq ft need 3 tons. Use the table above as a starting point, then have your contractor perform a Manual J for the exact tonnage.
Yes, significantly. Standard sizing tables assume 8-foot ceilings. Vaulted ceilings (10–12 feet or higher) increase the volume of air that needs to be cooled and can add 10–20% to your cooling load. A 2,000 sq ft home with 10-foot ceilings effectively has the same air volume as a 2,500 sq ft home with 8-foot ceilings. This is one of the key reasons a proper Manual J — not just square footage — is essential for accurate sizing.
