Professional HVAC Load Calculator (BTU & Ton)

How This HVAC Load Calculator Works

This professional HVAC load calculator estimates the cooling load required for a room or office based on room area, ceiling height, glass exposure, building orientation and city climate conditions.

Cooling Load Factors

• Room area heat load
• Ceiling height adjustment
• Glass solar heat gain
• Building direction heat exposure
• City climate factor

Calculation Method

Base Cooling Load = Area × 25 BTU

Height Adjustment = Ceiling Height ÷ 10

Glass Heat Load = Glass Area × 60 BTU

Final Cooling Load = (Base Load × Height Factor + Glass Load) × Direction Factor × City Climate Factor

Required AC Size (Ton) = Cooling Load ÷ 12,000

Example

Room Area = 300 sq.ft
Ceiling Height = 10 ft
Glass Area = 40 sq.ft

Estimated cooling load ≈ 9,000 – 12,000 BTU depending on conditions.

This calculator helps homeowners, HVAC engineers and consultants estimate AC tonnage for proper system sizing.