What does heat rejection mean?
Short Answer
Heat rejection refers to a film's ability to block solar energy (heat) from passing through the glass. It's typically expressed as a percentage — higher means more heat blocked.
Full Explanation
Solar energy that enters through glass includes visible light, infrared (IR) radiation, and UV rays. Heat rejection measures how much of this total solar energy is blocked. A film with 60% heat rejection blocks 60% of the solar energy that would otherwise pass through. TSER (Total Solar Energy Rejected) is the most comprehensive measure. IR rejection specifically measures how much infrared radiation (the primary heat carrier) is blocked. High-performance ceramic films can achieve very high IR rejection rates.
What to Consider
- TSER is the most comprehensive heat rejection metric
- IR rejection specifically measures infrared heat blocking
- Higher heat rejection improves comfort and can reduce AC load
- Darker tint does not always mean better heat rejection
- Ceramic films can be light in appearance but high in heat rejection
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