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Insulation ratings are measured in R-values per inch of thickness. An R-value tells you how well a type of insulation can keep heat from leaving or entering your home. Insulation R-values vary based on the type, thickness and density of the insulation material. Typically, a higher insulation R rating means better climate control and better energy efficiency for your home. A higher insulation R-value usually means a higher price point as well. 

For every type and material of insulation, check the R-value per inch of thickness that the manufacturer has listed. In general, the insulation’s method of installation can give you an idea of how it compares to other types of insulation. 

Here are the installation methods from lowest to highest average R-value per inch: 

• Blown-in (or loose-fill) insulation
• Insulation blankets (batts and rolls)
• Spray foam insulation
• Foam board insulation 

Your home doesn’t necessarily need the highest R-value insulation. The R-value your insulation needs depends on your local climate.  

The map above shows each region of the U.S. and the Department of Energy’s corresponding climate zone. Once you find your home’s zone on this map, you can determine the minimum R-value your insulation should have. 

_{Note that the material the insulation is made from will change the R-value as well.  Radiant barriers and vapor barriers are not rated by R-values}