Certifications ~ Licenses ~ Memberships

Cozy Home Performance, LLC is committed to industry best practices, training and professional development.  We are trusted by our clients and colleagues with upholding each merited credential, certification and license and we do so proudly.  We believe that it is our responsibility to not only maintain but also raise the bar of excellence so to support the building performance industry and allow for it to become a leader in the future success of our society.  At Cozy Home for the practice of sustainability to take root we must be committed to accountability, transparency and excellence.  We must have the resolve in becoming more part of the solution each day.  Always, Our Knowledge is your advantage.  We are recognized by the Best in the Industry.


BPI Accredited vert CHP is an Accredited Contractor with the Building Performance Institute, Inc.  BPI is the nation’s premier standards development and credentialing organization for residential energy efficiency retrofit work.  They are helping build an industry, create a workforce, and support programs through professional certification, contractor accreditation, and quality assurance services.  As the market for energy efficiency services grows, it is important that contractors are held to BPI standards based on building science to ensure high quality work is done.  Find out more on the BPI website.

BPI Individual Certifications:

  • Mark Lantz:  Certified Building Analyst, Envelope and Heating Professional certification #5003191
Cel-Pak Pro logo1 Cozy Home Performance proudly uses National Fiber’s ‘cel-pak’ cellulose insulation and we are certified Cel-pak Pro installer.  National Fiber is located in Belchertown, MA and produces an industry best product.  Find out more on the National Fiber website.
SnellGroup Infrared thermography training The Snell Group is the world’s leading expert on using infra-red thermography.  They set the standards and work with the utmost integrity.  Mark Lantz is a Level 1 thermographer by The Snell Group Certification Standard.  This standard follows the American Society of Nondestructive Testing (ASNT) guidelines for certification.  The application of infra-red thermography is a serious matter that can be mis-applied, even abused.  That said Cozy Home adheres to the highest professional standard and application of infra-red technology.  Find out more on the Snell Group website.
masssavepartnerlogo Mass Save® is an initiative sponsored by Massachusetts’ gas and electric utilities and energy efficiency service providers, including Columbia Gas of Massachusetts, The Berkshire Gas Company, Cape Light Compact, National Grid, New England Gas Company, NSTAR, Unitil, and Eversource.  The Sponsors of Mass Save work closely with the Massachusetts Department of Energy Resources to provide a wide range of services, incentives, trainings, and information promoting energy efficiency that help residents and businesses manage energy use and related costs.
Cozy Home has met all training and certification requirements to be eligible to work within the Mass Save Home Energy Services Program.  We provide Independent Insulation Contractor services for these select Utility Providers:  Eversource, National Grid, Berkshire Gas and Columbia Gas.  Find out more on the Mass Save website.


  • Home Improvement Contractor License #162770
  • Construction Supervisor License #102169
epa_leadsafecertfirm Cozy Home Performance, LLC, is a certified EPA Lead-Safe company.  You can be confident that we will follow Lead Safe practices and procedures.  Under the new EPA Lead, Renovation, Repair & Painting (RRP) rule, contractors, renovators, remodelers, painters, maintenance workers and others performing renovation, repair and painting projects that disturb lead-based paint in homes, apartments, child care facilities, and schools built before 1978 must be certified.  Find out more on the EPA Lead Safe website.

Industry Membership

Efficiency First founding member Cozy Home Performance is proud to be a founding member.  Efficiency First is a national nonprofit trade association that unites the Home Performance workforce, building product manufacturers and related businesses and organizations in the escalating fight against global warming and rising energy costs.  Efficiency First represents its members in public policy discussions at the state and national levels, to promote the benefits of efficiency retrofitting and to help our industry grow to meet unprecedented demand for quality residential energy improvements.  Find out more on the Efficiency First website.
Home Performance with Energy Star ENERGY STAR is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy efficient products and practices.  Find out more on the Energy Star website.


Cozy Home Performance LLC has met all of the Better Business Bureau’s accreditation standards and has maintained an A+ rating since 2010.  Find out more on the BBB website.

Testimonials from Cozy Home Customers

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Cozy Home Performance is hands down the best energy diagnostic and insulation company in the Valley. Mark and his crew enter and exit your work stream seamlessly, on time and on budget. The key is the knowledge, experience and personal responsibility each employee brings to his work. Mark not only has design experience, he also has the creative spark that leads to innovative solutions to unique problems. With all forms of insulation under one roof, careful diagnostics and appropriate choice of material, one always get the most out of every insulation dollar from Cozy Home Performance!!
John Ferriter, in construction in the Valley for 45 years
I’m happy that the incentive was more than anticipated (As a Home Performance Contractor with Mass Save Cozy Home secured $2,760 in project incentive funds.). I enjoyed working with you and your crew. Everyone was pleasant to deal with. They were professional and courteous and when I had questions, the answers were in a non-technical response so I could understand. Each day they left the area clean.
D.N., Easthampton, MA
Someone from the utility company was here today to inspect the work resulting from their incentive. They were very positive both about the quality of the recommendation, and the quality of the work. I am pleased too. I’m almost looking forward to next winter to see the difference.
Phil, Northampton, MA
The house definitely feels different – hard to explain the feeling, maybe more solid? Anyway, we have checked out all the work areas that we could and are really impressed. We can already feel the difference in some rooms – even with the warmer weather! Thanks to all the guys who were at the house. They were all very polite and pleasant and seem to have done an awesome job!
K.C., Goshen, MA