Lighting Heat Gain Calculator

Lighting Inputs

Room / Zone Area (ft²)

Lighting Type

Lighting Power Density (W/ft²)

Ballast / Driver Factor

Space Use Factor (fraction on)

Radiation Fraction LED≈0.37, Fluor≈0.54, Incand≈0.87

CLF (Cooling Load Factor) 0.97 continuous; 0.80–0.90 intermittent

Results

Total Power

—

Watts

Total Heat Gain

—

BTU/h

Cooling Load

—

BTU/h (CLF adjusted)

Radiant Portion

—

BTU/h

Convective Portion

—

BTU/h (immediate load)

Equivalent Tons

—

tons

ASHRAE 90.1-2019 LPD Compliance Check

Space Type

ASHRAE 90.1-2019 LPD Limits Reference

Space Type	Max LPD (W/ft²)
Office	0.64
Classroom / Lecture	0.71
Retail	1.05
Warehouse	0.33
Corridor / Transition	0.41
Lobby / Atrium	0.90
Conference / Meeting	0.97
Healthcare Patient Room	1.07
Dining	0.65
Restroom	0.63

Do the full calculation in AIM Works

This calculator handles one step. AIM Works runs the complete MEP design workflow — thermal load calculations, duct & pipe networks, equipment selection, code compliance, and an AI design assistant — in one tool.

✓ ASHRAE 62.1 ventilation + CLTD/CLF/RTS load methods

✓ Darcy-Weisbach pipe & duct network solvers

✓ ASHRAE 90.1 / IMC / NFPA compliance checks

✓ 20 free AI design messages included in trial