Attic Insulation

Attic Insulation

Create a Comfortable Home with Proper Attic Insulation

Do your upstairs rooms feel too cold in the winter or too hot in the summer? Do ice dams form on your roof? If your attic isn’t properly insulated, your home is working harder and costing you more every season.

Evergreen Home Performance installs attic insulation in Portland, Maine and the surrounding areas, backed by building science and real-world results. Since 2006, we’ve helped thousands of Maine homeowners solve comfort issues, prevent ice dams, and lower energy bills.

Evergreen team member adding climate control fabric during insulation job
Evergreen insulation crew at work in attic

How Attic Insulation Works

Insulation acts like a down jacket for your home. It slows the transfer of heat—keeping warmth in during winter and blocking heat from entering in summer.

With proper attic insulation:

  • Your home stays warmer in winter and cooler in summer
  • Upstairs rooms feel more consistent and comfortable
  • Your HVAC system runs less often and lasts longer
  • Your heat pump and ductless mini-splits work best
  • You reduce energy waste and lower monthly heating and cooling bills

And when paired with attic air sealing, insulation also helps prevent moisture buildup, mold, and ice dams—common issues in Maine homes.

Air Sealing + Insulation = Long-Lasting Attic Protection

Insulation is powerful—but without air sealing, it’s incomplete.

Most attics have hidden gaps and cracks that allow air to flow freely between the inside and outside of your home. Before adding new insulation, we seal those leaks with high-performance spray foam to stop the airflow—and help your insulation perform its best.

Together, air sealing and attic insulation create a strong, continuous barrier against heat loss, moisture, and drafts.

Evergreen team air sealing with caulk in attic
Insulation crew standing in front of Evergreen home performance truck

Creating Conditioned Attics with Attic Insulation

Want to use your attic for storage—or even future living space? A conditioned attic may be the right move.

By insulating and air sealing the roofline (rather than the attic floor), we can help you turn your attic into a more stable, usable space—perfect for storage, offices, or homes with HVAC equipment in the attic.

What’s the Best Type of Attic Insulation?

We offer a range of attic insulation materials to match your home’s needs, but in most Maine homes, we recommend:

Blown-in Cellulose Insulation

Made from recycled paper and treated with borate, cellulose insulation is fire-resistant, mold-resistant, and highly effective. It can be installed as loose-fill or dense-packed. Cellulose is eco-friendly, non-toxic, and especially well-suited to Maine’s climate—it’s the most common attic insulation installed by participants of Efficiency Maine rebate and financing programs.

Learn More

Spray Foam for Air Sealing

Before we install insulation, we seal leaks with spray foam to prevent air infiltration. This critical step protects against drafts that can weaken your insulation’s effectiveness and ensures your insulation performs as designed.

Learn More

Save on Attic Insulation with Efficiency Maine Rebates & Other Incentives

  • Up to $8,000 in Efficiency Maine rebates
  • 30% federal tax credit (up to $1,200 per year)
  • Home energy efficiency loans with payments as low as $50/month through Efficiency Maine and NEIF

Rebates and incentives for attic insulation in Maine are always evolving. As a leading insulation company in Portland, Maine and beyond, we’ve helped more local homeowners qualify for Efficiency Maine rebates and financing than any other company, and we’ll help you maximize your savings.

Evergreen Attic Insulation team members smiling in the attic during a job

Transform your home’s comfort and energy efficiency—Evergreen is your local insulation guide! Call 207-594-2244 or contact us online to schedule your free consult today.

Stop energy loss and create comfort that lasts year-round in your Maine home.

BOOK YOUR FREE CONSULT TODAY

I highly recommend Evergreen! 1st, I had a home efficiency inspection (that was free) & Bryan P. was great! He took the time needed, asked & listened to what I thought were priorities, explained clearly what he thought were priorities & why, then gave me numerous options. No pressure whatsoever. Then I had my attic sealed & insulated as the 1st step & Bryan came along on day 1 to introduce everyone & make sure we were all on the same page. Bruce's team (inc. Kelsey & Roland) did the work - they were exceptional!!

Melissa M.

Kennebunk

I was very impressed by the professionalism of this company and the workers. Brian R. was very prompt in replying to my questions; the crew was meticulous in all parts of the work and attentive to the safety aspects concerning Covid; and Brian was extremely thorough in the final inspection. My attic is now snug and warm and I've noticed that the second floor is warmer as well.

Julia S.

Rockland

Really great experience from start to finish with Evergreen. They helped us prioritize what needed to be completed first, and has made a significant difference in our hearing costs already. Plus they were really friendly and considerate to work with!

Amy W.

Kennebunk

From beginning to end – that is from the moment Justin McEdward stepped into our home to assess our energy conservation needs until the crew left – the Evergreen Home Performance process went absolutely smoothly. Justin made a thorough inspection and took pictures with an infrared camera. His proposal described the scope of work in detail, and he explained what we could expect the proposed work to accomplish. Our proposal was forthcoming within a couple of days, and Justin was available to discuss it and answer questions.

Adrienne Harkavy

Evergreen completed the work at my home thoroughly and professionally. An inspector from Efficiency Maine came to inspect afterwards and described it as "state of the art" and "outstanding". The crew was very pleasant and considerate during the project. Their cleanup each day was perfect. Communications with the office were easy and reliable. I am very satisfied.

Catherine H.

South Portland

Great company. Very professional and thorough. They take the time to explain everything and offer options to fit your budget. Wonderful experience from start to finish.

Bonnie Eustace

We had Evergreen energy do blow-in cellulose. I was very happy with the result. They tested with blower-door before and after. House is now MUCH warmer. Also, in the time since when I've had to open walls for various access, I've been impressed with how they got the insulation packed in everywhere. I'd use them again.

Noah

Peaks Island

The team members were very professional, worked very hard, paid very close attention to detail and cleaned up meticulously every day. I really appreciated the care they took knowing the smallest details were going to make a big difference to our heating bills. Thank you!

Pam B.

Brunswick

Thorough, smart, informative, integrated, and communicative -- that's how my experience was with Evergreen even with the covid interruption midstream. The team picked up where they left off, insulated basement and air sealed attic and knee wall in 100' temps under the eaves! This business group was a pleasure to work with.

Karen W.

Gray

Evergreen has a professional and reliable team of people who do excellent work. If you want the best of the best in the area, select Evergreen to accomplish your insulation needs.

Mary E.

St. George

We initially contacted Evergreen through Efficiency Maine for an energy audit, which was conducted promptly and professionally by Justin McEdward, one of their Energy Advisors who is BPI-certified. After a thorough inspection of our newly purchased home, Justin explained in great detail what we needed and did not need. It was agreed that Evergreen would remove all of the existing attic insulation, which was not adequate, and replace it with blown in cellulose, to a rating of R-60.

Thomas W.

Scarborough

Evergreen did an amazing job insulating our historic home. Their professional staff worked hard to ensure the tough areas in the attic were covered, and clearly communicated their progress. We are seeing the results with our discounted heating bills. Thank you, Evergreen!

Melissa Knoll

Portland

First we have Evergreen do a BIG project worth about $20K (windows, basement, insulate & rebuild an entire wall, a door, attics, and air sealing). They were so great we had them come back later when we decided we did want to do our other door. They are professional and do great work. They take care of your home and are trustworthy, and on top of all that friendly! I highly recommend you call them!

Garreth C Debiegun

Evergreen removed and replaced the insulation in my attic. They did a great job!, Crew was excellent, and the whole thing went smoothly, and the attic was NOT easy to get into or work in, so kudos to some hard work done well!

Joel A.

Portland

We are thrilled with the job Evergreen did to transform our 213 year old home into a warm, draft-free, cozy space. The entire team led by Bruce was prompt, courteous, knowledgeable, and hard working. If Evergreen could transform our home in this way, we are sure they would make a comparable difference in YOUR home!

Jonathan M.

Bridgton

Portland Buy Local
Efficiency Maine
EPA Lead-Safe Certified
Building Performance Association
BPI Certified