The radiant interior surface temperatures play an important role in how humans perceive thermal comfort. Radiant temperature asymmetry is key i.e. surface temperatures must be close together. If a surface temperature difference exceeds 4 °C we notice it, we can feel it. So if we take a comfortable internal air temperature, in a Passive House or good standard Low Energy house, of 20 °C we can expect to find that the inner surfaces of the external walls to be at around 19 °C and the surfaces of internal partitions to be at around 21 °C.

The internal surface temperatures of double glazing vs triple glazing will be quite different.

Comparison of internal surface temperatures for double glazing vs triple glazing

External Temperature °C	Internal Surface Temp Double Glazed window ° C	Internal Surface Temp Triple Glazed window °C
2	16.7	18
0	16.3	17.8
-2	16.0	17.6
-5	15.4	17.3
-10	14.6	16.7

Window fitting details to reduce Cold Bridging