m²·h·°C/kcal

square meter hour Celsius per kilocalorie

Areal thermal resistanceexact by definition

The square meter hour Celsius per kilocalorie is 3600/4184 = 0.8604206501 m²·K/W. It is the pre-SI European insulation unit, and it is close enough to the RSI that legacy figures are easy to misread as modern ones; the ratio is 0.86, not 1.

1 m²·h·°C/kcal 0.86042065 RSI (m²·K/W)