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Rule Your Attic Tool

ruler measuring 18 inches of insulation in an attic

Investments in attic insulation will save you money on heating and cooling plus keep you comfortable. Columbia Water & Light recommends having 18 inches of attic insulation (R-50). We will help finance your project with rebates and loans through our Home Performance with Energy Star program.

"rule your attic" for comfort and savings Energy Star logo

Does your attic insulation measure up?

Use this calculator to see how much insulation you may need, rebate amounts and payback period.

How much will you save?

Use these estimates to find out how much you could save on heating and cooling in a year by improving your attic insulation to 18” (R-50).
a visual example of how much insulation is appropriate for attic space

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