The core idea
A room can feel cold even when the air temperature seems normal because large cold surfaces change radiant heat exchange.
How the mechanism works
People exchange heat with surrounding surfaces; cold glass or walls can create discomfort without a major air-temperature difference.
When it becomes relevant
Typical trigger: Cold weather, large glazing areas or poorly insulated exterior surfaces.
Evidence that supports this interpretation
- Discomfort is strongest near one surface
- Air temperature is normal but surface temperature is low
- Draft tests are weak
Evidence that weakens it
- The whole house air temperature is low
- HVAC supply is absent
- The sensation occurs away from exterior surfaces
What this concept cannot prove alone
A single observation, image or meter reading cannot confirm the complete failure pathway. Use this concept to form better questions, compare alternatives and decide which safe observation would be most informative next.
Safety and professional boundary
Comfort improvements should distinguish radiant, airflow and humidity causes before equipment is resized.
Primary references for this topic family
These references ground the general building-science or safety context. They do not diagnose a specific house, replace local requirements or certify a repair.
