755 Banfield Rd., Unit 102, Portsmouth, NH 03801

capstone mechanical

Your Trusted HVAC-R Advisor

We think of our customers as much more than simply “a company”—they’re real people with real needs, concerns and expectations. We treat every customer as a relationship—and we treat each relationship with courtesy, kindness, devotion and dedication.

Our Services

We make your Commercial HVAC-R needs our top priority.





The Capstone Team


An extraordinary group of hardworking, passionate individuals with unique, creative, and highly effective skills to solve problems and provide exceptional customer care.  

What Our Team Values

Capstone Culture

Built on trust and transparency. We are a team that takes pride in our work, and the relationships that we build. We're all in it together.

Safety Always

Everyone is a safety advocate, for ourselves, our teams, our families, our customers, and the community. Our entire team makes safety their responsibility.

Customer Care

Provide an exceptional customer service experience by understanding our customers unique needs and by providing proactive guidance.

Holistic Wellness

Comprehensive wellness program provides everyone access to resources to guide team members and their families along their unique personal wellness journeys.


Freedom and flexibility provides team members the autonomy to best support our customers at point of service while sustaining personal wellbeing.

Building Community


Team members support local communities they are passionate about through various events and charities.  

Trusted By