Window Solar Heat Gain Calculator

Window & Glazing Inputs

Window Area (ft²)

SHGC (Solar Heat Gain Coefficient)

Window Orientation

Latitude

Month

Exterior Shading Factor (0–1)

Interior Blind Factor (0–1)

Window U-Value (BTU/h·ft²·°F)

Outdoor – Indoor Temp Difference (°F)

Results

Solar Gain

—

BTU/h

Conduction Gain

—

BTU/h

Total Window Gain

—

BTU/h

Peak SHGF Used

—

BTU/h·ft²

Orientation Comparison — Peak Solar Heat Gain (BTU/h)

SHGF values from ASHRAE HOF Table 26 (July, no shading). Actual gain = Area × SHGC × SHGF × shading factors.

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