How it works
Warm air escapes through gaps around light fixtures, plumbing vents, wires, chimneys and attic hatches. Insulation slows heat moving through the ceiling but does not stop air moving through gaps, which is why the sealing comes first.
Some utilities pay part of the cost. Xcel Energy's 2024 to 2026 program covers 40% of attic insulation up to $1,200 and of air sealing up to $600 for customers it heats, done together by a participating contractor. The federal tax credit for this work ended for projects finished after December 31, 2025.
- An energy assessment with a blower door test measures how leaky the ceiling is.
- Leaks between the house and attic are sealed with caulk or spray foam.
- Insulation is added to the attic floor.
- A second blower door test shows the result, which some rebate programs require.
When to call
Call after a winter with ice dams, when upstairs rooms are hard to heat, or before replacing a roof, so the attic is fixed while it is open.
- Icicles or ice along the roof edge fixes cause
Attic Insulation & Air Sealing by state
| State | License rule | Busiest months | Confirmed businesses |
|---|---|---|---|
| Minnesota | Contractors who work for homeowners in more than one skill area need a state license as a building contractor, remodeler or roofer, and roofing alone needs one too. License numbers begin BC, CR or RR. | Sep, Oct, Nov | 138 in Minnesota |
Sources
Guides on attic insulation & air sealing
- How to Prevent Ice Dams in MinnesotaSeal the air leaks in the ceiling first, then insulate the attic to at least R-50 where space allows, as the Department of Commerce advises. Keep the natural vents open and skip powered ones. Until the work is done, rake snow off the lower roof from the ground after big storms.
- How to Remove Ice Dams in MinnesotaIf water is coming in, hire an ice dam removal service that uses steam, as the Minnesota Department of Commerce advises, and skip chipping, chemicals and open heat. If the house is dry, rake snow off the lower roof from the ground. Then seal the attic air leaks that cause ice dams.
How to get a quote
Pick a business from the list and use the contact form or phone number on its own website. Asking two or three lets you compare. Cold Home Guide does not take quote requests.