Commercial Load Calculator

Block load calculation for commercial spaces with internal gains.

Building Envelope

Floor Area (sq ft)

Ceiling Height (ft)

Building Type

Outdoor Design Temp (°F)

Indoor Design Temp (°F)

Internal Loads

Number of People

Lighting (W/sq ft)

Equipment (W/sq ft)

Ventilation (CFM/person)

Envelope

Roof Type

Glass % of Wall

Commercial Load Factors

Building Type	Sq ft/Ton	BTU/sq ft
Office	250-350	35-50
Retail	200-300	40-60
Restaurant	150-200	60-80
Warehouse	400-600	20-30
Medical	200-300	40-60
Church	150-250	50-80

Heat Gain Values

People (sensible): ~250 BTU/hr each
People (latent): ~200 BTU/hr each
Lighting: 3.41 BTU/W
Equipment: 3.41 BTU/W
Ventilation: 1.08 × CFM × ΔT (sensible)