What SHGC should I specify for different climates?

Hot climates: SHGC < 0.25 on all orientations. Mixed climates: SHGC < 0.25 on west/east, 0.40+ on south for passive solar. Cold climates: SHGC ≥ 0.40 on south-facing for winter gain.

What is low-e coating and how does it affect SHGC?

Low-e (low emissivity) coatings reduce U-value by reflecting long-wave radiation. Soft-coat low-e (hard coat): SHGC 0.4-0.55 (higher solar transmission). Spectrally selective: SHGC 0.25, U-0.23.

What is the difference between SHGC and SC (shading coefficient)?

Shading coefficient SC = SHGC / 0.87 (old reference is single clear glass SHGC=0.87). Low-e double pane: SHGC 0.30 = SC 0.34. SHGC is the modern standard; SC is legacy term.

Solar Heat Gain Coefficient Calculator

Calculate solar heat gain Q = SHGC·A·I_t. SHGC 0.25-0.87 for glazing. Low SHGC (0.20-0.30) for hot climates, high SHGC (0.50+) for passive solar. Visible transmittance and SHGC tradeoffs.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Calculate solar heat gain Q = SHGC·A·I_t. SHGC 0.25-0.87 for glazing. Low SHGC (0.20-0.30) for hot climates, high SHGC (0.50+) for passive solar. Visible transmittance and SHGC tradeoffs. Use the shgc result to inform your clinical assessment.

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Frequently Asked Questions

What SHGC should I specify for different climates?

What is low-e coating and how does it affect SHGC?

What is the difference between SHGC and SC (shading coefficient)?