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Learn about our screening process

10 Years In Business

Company Details


2910 South Justen Road
McHenry, IL 60050


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Service Details

  • Small Jobs Welcome

Areas of Expertise

  • Blown-in Insulation
  • Air Sealing
  • Home Performance
  • Residential and Commercial Energy Auditing and Retro-Fitting
  • Tile and natural stone insulation
View All Offerings and Cities Served

Cost Information

  • Free Estimates
  • Warranty Offered


37 Verified Reviews
  • 5
  • 4
  • 3
  • 2
  • 1

Highly rated for

  • Quality
  • Value
  • Customer Service
Showing 1-10 of 37 results
5.0 Daniel C. Barrington, IL

We reached out to Dan with the issue of freezing pipes and cold rooms in our old house. Dan inspected the house and proposed a plan to remedy these issues. Aside from the more traditional air sealing and insulation solutions, Dan also recommended insulating the area of our house above our soffit, which was difficult to access but that appeared to be a major insulation issue. I should add the other firms we requested quotes for did not identify this area in their proposal. I firmly believe the proposals from the other firms would not have fixed our issues. Dan worked for ~2 weeks on air sealing our attic and house, adding insulation to our attic, removing our soffit and adding insulation and reinstalling soffit. Work was done well and within budget and at a fair price. Dan is very easy to work with and takes pride in his work. We are very happy to report our pipes have not frozen and the cold rooms are no longer cold - would highly recommend Dan to others - he went above and beyond.

5.0 Dave O. Marengo, IL

Easy to get a hold of and did a great job. Was very flexible with scheduling times to come out.

5.0 Al R. Barrington, IL

What I really appreciated was his follow up and his attention to detail. He was proactive, professional and he kept us informed. His customer service is outstanding as well as his professionalism. He made complete sense and communicated to me in an understandable way and his presentation was great. He made sure he called in advance on his appointments and for me everything was a pleasant experience.

5.0 Kevin W. Wauconda, IL

Highly Recommend Zenergy for your next residential or commercial insulation project. Extremely fair bid, scheduled quickly, stayed within scope of discussed project. Well organized, discussed project during each step, Fair price for work performed. Completely winterized and sealed home to measure energy cost savings, Performed CFM Test prior to work and after to show benefits of attic, crawl space and weatherproofing our home. Do not wait hire immediately and share energy cost savings.

5.0 Kathy W. Wood Dale, IL

Dan did a great job showing me all of the ways my home was losing heat in the winter and then fixed the issues. Really nice guy, informative, hard working. Not only did he install lots of insulation he also sealed cracks, vented bathroom fans, sealed up an old kitchen fan, etc. He showed up as promised and completed the work in a very timely manner.

5.0 Kasia S. Hoffman Estates, IL

We hired Dan to insulate our attic. Dan explained all the issues we had (bathroom fans not connected to the outside, air gaps on the recessed lights, etc.). Over the course of three days Dan corrected all the issues and installed new insulation. Dan is very professional, detail oriented and a super nice guy! We would definitely recommend him to others. A+++ job! John and Kasia, Hoffman Estates, IL

4.0 Gil F. Gurnee, IL

He was very responsive; seemed to have done a good job. Very nice. Not very professional though: he never discussed the kind of insulation he planned to use or provide an invoice or even a business card.

5.0 John C. Null, IL

Dan did a great job insulating my attic. He did exactly what he said he would do, on time and at the quoted cost. He was very thorough in his work, applied foam sealant, installed baffles, installed bathroom vent access thru roof and installed blow in insulation. Nice guy as well. I'd hire him again.

5.0 Steven A. Vernon Hills, IL

Dan was very thorough in explaining the issues with our current insulation and what he could do to improve the insulation in our attic. He was able to squeeze us in a few days early and completed the work within the time frame he had proposed. He walked us through everything he did and how it would help with our concerns. He took pictures of his work to show us what he did. He was very professional, polite and timely. I would definitely recommend him to others.

5.0 Tony M. Elgin, IL

Dan was very helpful in explaining the process and making note of all aspects of the job. Done quickly, with no mess, and worked around our schedule.


Daniel Nagel

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