Climate-zone awareIECC / DOE data

Stop Heating the Outdoors.

Most US homes are under-insulated. Check your attic against IECC and DOE retrofit targets in less than 30 seconds.

Advanced ROI Calculator

Auto-detect your climate zone from supported ZIP codes or choose it manually.

ZIP lookup is optional. You can choose a climate zone manually.

Learn Before You Buy

Popular Insulation Guides

View all guides
Attic Insulation Cost

See what actually drives project cost, quote ranges, and payback.

Depth Chart

Turn inches of attic insulation into an approximate R-value before you buy more.

Air Sealing

Learn why leakage control often matters as much as adding more insulation.

Climate Zone Guides

Go straight to Zone 1 through Zone 8 attic targets and seasonal risks.

Plan the Scope

Before You Call a Contractor

Explore the full hub
Attic Insulation Inspection Checklist

Walk the attic in a more disciplined way before you request quotes or plan a retrofit.

How to Choose an Insulation Contractor

Use a practical checklist to compare attic contractors and quote scope.

Insulation Rebates and Tax Credits

Learn the paperwork and eligibility checks homeowners usually need before installation.

Attic Insulation Removal

Understand when attic insulation removal is warranted and what usually changes the scope.

Frequently Asked Questions

Everything you need to know about attic efficiency.

What is 'R-Value' and why does it matter?
R-Value measures how well insulation resists heat flow. The higher the R-Value, the better the insulation power. If your R-Value is too low, heat escapes in winter and enters in summer, forcing your HVAC system to work overtime.
How do I know my current insulation type?
Look into your attic. If it looks like pink/yellow cotton candy, it's likely Fiberglass. If it looks like grey shredded paper, it's Cellulose. If it looks like expanding foam, it's Spray Foam. Measure the depth in inches to calculate your current R-Value.
How much money can I actually save?
According to the EPA's Energy Star program, homeowners can save an average of 15% on heating and cooling costs (or roughly 11% on total energy costs) by air sealing their homes and adding insulation in attics, floors over crawl spaces, and basements.
What is the difference between 'New Code' and 'Retrofit Target'?
'New Code' (IECC 2021) is the strict standard required for newly built homes. 'Retrofit Target' is the recommendation for existing homes, balancing energy efficiency with the practical constraints of adding insulation to older structures.