How many square feet does a 3 ton AC cool?

Heating & HVACACCA Manual J Tonnage

HVAC Tonnage & Cooling Capacity Calculator

Calculate required air conditioner and heat pump cooling capacity in tons (and BTU/hr) based on building square footage and climate zone.

Heating & HVAC Field StandardsACCA Manual J Tonnage

Engineering formulations calibrated to IPC, UPC & NEC specificationsSub-Zero Cold Climate Tolerances

Quick Summary & Key Answer

To estimate HVAC cooling tonnage, divide conditioned square footage by the climate zone factor (roughly 500-600 sq ft per ton in moderate climates, and 700-800 sq ft per ton in cool northern climates). For a 2,000 sq ft home in a moderate climate, you need a 3.0 to 3.5-ton AC or heat pump unit (36,000 to 42,000 BTU/hr).

1 Ton of cooling capacity = 12,000 BTU per hour.
Properly sized AC systems deliver roughly 400 CFM of airflow per ton.
Oversized cooling equipment cools too fast without dehumidifying, creating cold, clammy air.

Interactive Calculator

Adjust inputs for real-time results

Living Area to Coolsq ft

sq ft

Geographic Climate Zone

Sun Exposure & Windows

Calculated OutputHVAC Tonnage Verified

Recommended AC / Heat Pump Size

3.5 Tonstons

Total Cooling Capacity in BTU/hr: 42,000 BTU/hr
Calculated Exact Load: 3.48 Tons
Airflow CFM Requirement (400 CFM/ton): 1400 CFM

Note: 1 Ton of cooling equals 12,000 BTU/hr. Never significantly oversize AC tonnage; oversized units short-cycle and leave humidity in the house.

Dangers of Oversizing AC Tonnage

Short-cycling occurs when an oversized unit reaches temperature in 5 minutes, failing to remove indoor humidity.

Frequently Asked Questions

Common questions regarding this calculation and code compliance

A 3-ton air conditioner (36,000 BTU) typically cools between 1,500 and 1,800 square feet in warm climates, and up to 2,200 square feet in cool northern regions.