Insulation: R-values

Factual Questions
1

Does anyone know if R-values are always in English units? It seems to be the case, but can someone confirm…

Thanks,
Jinx

2

You need to be a little more specific. There are of course R values in SI units, but they are not seen much in the US housing market, if that is what you are asking about.

3

I figured that is the case - talking about R-# used in USA for commercial HVAC application. It probably is English units for the rating…

Thanks…

  • Jinx