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Heartwood Insulation Company blows cellulose, and by its own account it brings over 10 years of cellulose insulation experience, from consulting through installation and diagnostic testing, with free blower door tests and Efficiency Maine rebates. Its website names Waldo, Knox and Lincoln as its service area. On Google it shows 5 stars from 19 ratings. A recent customer with a cathedral ceiling said Heartwood was the only crew they felt comfortable hiring after Evergreen didn't want to touch the job; that customer said Joel and Simon showed up on time, finished on schedule and left the site tidy each day. The same customer noted one condition worth knowing: Joel doesn't work during the summer because he farms, so their project couldn't be scheduled until the fall. A recent cabin customer wrote that Joel Miller handled a basement job that included insulation, repairing rotten joists and replacing a wobbly ladder to the exterior entrance with stairs and a Bilko door, and that he completed and submitted the paperwork for the Maine Energy Efficiency rebate. A 2026 customer said Joel and his crew dense-packed a newly built home to fix a noise issue, sealing and draping the rooms, and that the dense pack resolved the sound issue with no dust or debris left behind. A 2026 reviewer wrote that Joel blew 16 inches of TimberHP loose fill into their ceiling. A 2026 customer said a free consultation went room to room to show where the heat loss was, and that their attic was insulated in about 7 hours. A 2026 customer described a blower door test during which Joel let them check for places where cold air could be coming in. The work is not only insulation. A 2026 customer said Heartwood won the bid on a garage roof repair after a large tree slammed a hole in the roof and exterior wall, and that the debris was cleaned up when the job was complete. A 2025 customer said Joel worked with them to submit the paperwork to Efficiency Maine for their rebate after Heartwood insulated their attic and basement.
I had talked with several insulation contractors about my project, which had some unusual needs related to a cathedral ceiling , and this was the only crew I felt completely comfortable hiring. Evergreen didn’t want to touch it, and others recommended questionable solutions. Joel took the time to understand my house and figure out the right approach. Joel was thoughtful, knowledgeable, and incredibly communicative throughout the project. He explained everything they were doing and responded promptly to all of my questions and concerns-- never brushing them aside. I really appreciated that he treated me as someone who wanted to understand my house, not just as a homeowner who needed a job done. Joel and Simon showed up on time, finished on schedule, and left the site tidy each day. But what really blew me away was their attention to detail and generosity with the small finishes that other contractors skip. It was clear they were paying attention and genuinely cared about the quality of their work. They also coordinate with Efficiency Maine, so I would definitely recommend working with them and taking advantage of the available rebates. The only downside is that Joel doesn't work during the summer because he farms, so my project couldn't be scheduled until the fall. But honestly, they were worth the wait. I would 100% hire them again and would recommend them without hesitation.
I had the good fortune to have Joel Miller of Heartwood Insulation complete a challenging project in the basement of my cabin. The job included not only insulation but repairing rotten joists and replacing a wobbly ladder to the exterior entrance with stairs and a Bilko door. Joel is knowledgeable and a true professional in every aspect of his specialty. His proposal was detailed, specific and his estimate of costs was accurate. Once the project began, he was onsite consistently. He is an excellent communicator who returned calls and texts quickly, explained the process and materials, patiently answered questions and kept me updated on the progress. His workmanship is impeccable using high quality, environmentally friendly materials. At the completion of the job all construction debris was removed and the work site cleaned thoroughly. Joel completed and subitted all paperwork for the Maine Energy Efficiency rebate. Heartwood Insulation and Joel Miller receive my highest recommendation.
Working with Joel and Heartwood Insulation Company was a wonderful experience. He was so efficient, knowledgeable, considerate, fair and respectful. He always made sure that I understood the process and that the final decision was mine. I had some basement work done and attic insulation replaced. His work is phenomenal and I will recommend Heartwood to everyone who needs to hire some work done. Thank you Joel and Team!
Joel and company did a great job. The whole time I felt he was professional, honest, and pleasant to deal with. He did a great job, cleaned up nicely, and was on time. Very happy!
These are top-notch people who worked creatively with us as our project shifted. They were flexible with our timeline, offered us several options to work with our budget, delivered an outstanding product and left the site tidy. Also the crew is friendly!
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2 changes recorded — last scanned Oct 30, 2026.