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Difference between R values and U values?


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User: Corinthians
Posts 50
Posted: 10/31/2007 3:43:01 PM
There are two big differences. The first difference is that R-value is used to rate the energy efficiency of a single component, while U-values rate the energy efficiency of the combined materials in a building component or section. Secondly, while R-values rate how much heat loss the material resists from passing through it, U-values rate how much the heat the component allows to pass through it. So, a high R-value indicates good energy efficiency - and a low U-value indicates good energy efficiency.

User: mike
Posts 50
Posted: 10/31/2007 10:07:39 AM
The conversion formula is simple R = 1/U and U =1/R.

User: kimchi
Posts 50
Posted: 10/31/2007 7:36:11 AM
R-values rate heat loss resistance and U-values rate actual heat loss.

User: peter
Posts 50
Posted: 10/1/2007 11:32:04 AM
I know they are both used for energy efficiency, but what is the difference between R values and U values for glass windows? How high a rating do you need if you live in Miami?


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