Logo | Diamond Mechanical

Keeping Homes and Businesses Safe and Comfortable Year-Round

We offer prompt and professional, residential and commercial HVAC solutions throughout New Hampshire and Southern Maine.

Reliable Services

Competitive Pricing

Knowledgeable Professionals

Don't Compromise on Safety and Comfort

Prioritizing Your Well-Being and Peace of Mind

The last thing anyone wants is to have their heating or cooling services fail them when they need it the most. Ignoring HVAC issues can lead to discomfort, high energy bills, but also poses potential safety and health concerns. Let our local HVAC team at Diamond Mechanical help keep your home or business safe and comfortable all year. 

Keep Your HVAC System in Peak Condition With Our Expertise

Serving New Hampshire and Southern Maine

Fair Pricing

When you choose us, you'll always know what you're paying for, with no hidden fees or surprises.

Personalized Service

We take the time to understand your unique needs and offer tailored solutions for your HVAC challenges.

24-hour emergency HVAC Services

We are available day or night for emergency repairs throughout New Hampshire and Southern Maine.

Your Partner for Reliable Comfort and Peace of Mind

Serving Residential and Commercial Clients

Our experienced team is dedicated to helping our clients keep indoor spaces cool in the summer and warm in the winter. We can work on oil, gas, or propane systems.

Extensive Industry Experience

With over 10 years of experience in the HVAC industry,  we've seen it all and know how to deliver the best results.

Proven Excellence

Our commitment to excellence has earned us the trust of countless clients throughout the areas of New Hampshire and Southern Maine.

Family-Owned Values

When you choose Diamond Mechanical LLC, you choose a neighbor who genuinely cares about your comfort and satisfaction.

Experience True Comfort in 3 Simple Steps

Our Process

Contact Us

Tell us about your HVAC needs.

Tailored Solutions for You

We provide a free estimate and let you know about your best options.

Enjoy Reliable Comfort

Sit back, relax, and enjoy a more comfortable indoor space.

Areas We Serve

  • Alton
  • Deerfield
  • Dover
  • Durham
  • Exeter
  • Gilford
  • Hampstead
  • Hampton
  • Kingston
  • Laconia
  • Northwood
  • Ossipee
  • Portsmouth
  • Surrounding towns and Areas

Hear From Our Satisfied Customers

What People Are Saying About Diamond Mechanical

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