by **Albrecht Stoecklein** » Mon Oct 30, 2017 3:34 pm

Hi Simon,

I thought I had updated all of them. Maybe you need to clear your browser cache to see them all with consistent units.

However, it is really just a naming issue. The numbers are the same.

The “K” stands for Kelvin, the “°C” obviously for degree Celsius.

Kelvin is the technically correct unit, however, the only difference between the two is that Kelvin measures temperature in absolute terms whereas °C has its 0 value at the freezing point of water. So 0°C is the same as 274.15K. 10°C is the same as 284.15K, etc..

The R-value describes the heatloss if there is a 1°C temperature difference between the two sides of the insulation material. But a 1°C temperature difference is of course the same as a 1K temperature difference. So the two R-value units are interchangeable.

I hope that clarifies it.