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How Functional Is Your HVAC System?

See how you can benefit from HVAC maintenance services

Proudly serving New Hampshire and Vermont

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Invest in Top-Notch Mechanical Services in Littleton & Plymouth, NH or St. Johnsbury, VT

Learn why it's important to maintain your heating and cooling system

If you've ever experienced heating and cooling problems, you know just how frustrating it is when your unit stops working. Neglecting to schedule routine mechanical services could result in HVAC system failure when you need it most.

In order to keep your heating and cooling functioning at its best, you'll want to hire Jeff Mackay Mechanical in Littleton, NH. Mechanical services are best left to a skilled professional who knows what they are doing and can provide quality work.

Find a mechanical contractor today to keep your heating and cooling system running smoothly.

Is Your Indoor Air Quality Hurting Your Health?

Reduce dust and allergens with air duct cleaning services in Littleton & Plymouth, NH or St. Johnsbury, VT

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Meet an experienced HVAC contractor

When searching for a mechanical contractor in Littleton, NH or St. Johnsbury, VT you can count on Jeff Mackay Mechanical for all your residential or commercial HVAC needs. Once you hire Jeff Mackay, you'll benefit from a skilled HVAC contractor who:

  • Has over 30 years of industry experience
  • Provides 24/7 emergency services
  • Offers free estimates for every service
  • Offers comprehensive mechanical services
  • Provides exceptional customer service



You can rely on Jeff to get your job done right the first time. Contact us today to get a free estimate on mechanical services in Littleton, NH, St. Johnsbury, VT and the surrounding areas.

Jeff MacKay Mechanical LLC

Air Conditioning Service

Proudly serving New Hampshire and Vermont

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What can Jeff do for you?

When you choose Jeff Mackay Mechanical, you'll be happy to learn that he offers comprehensive mechanical services. With over 30 years of experience, he's equipped to troubleshoot a variety of different HVAC issues and provide the best solutions. His work includes:




When you schedule regular heating and cooling maintenance services, you'll benefit from a longer-lasting and more energy-efficient HVAC system. If your system is beyond repair, Jeff can replace it for you.

Call now to speak with a mechanical contractor about your HVAC needs in the Littleton and Plymouth, NH areas.

Jeff rerouted an existing propane line to a new whole house generator I recently purchased. The work involved cutting and threading black iron pipe as well as installing a drip loop and flexible gas line on the generator. The work was excellent, very professional and neatly done.
I am very pleased.

Robert Meserve

Jeff has helped us with our furnace and heating three times now and I can't say enough good things about him. He responds to calls quickly, arrives promptly, and is very professional with his work. We had an emergency furnace leak early on Christmas Eve, and not only did he come to fix it, his pricing was very fair. We recommend him highly.

Christine Schmitt

Jeff Mackay provided us with outstanding workmanship. We were under a time constraint and Jeff went above and beyond the call of duty to get everything done on time. Jeff is the gold standard.

John Fitzgerald

Jeff and crew are honest, reasonable, timely and do meticulous work time after time.Never a worry when they do a job!!!

John Micciche

I had Jeff MacKay Mechanical come install a boiler for me and they produced nothing less than quality work. Jeff was very accommodating and made the installation process simple and quick. Him and his team are very friendly, reliable, and prompt with their service, leaving no mess behind. I would highly recommend!

Mike Heath

Yesterday our heat stopped working. I called Jeff and within 1hr he was onsite. Jeff was quickly able to diagnose and fix the problem the same day. Jeff was courteous, professional and his pricing was fair.

Collin D. Snow

Jeff was very professional and efficient. He showed up on the day he promised...which is rare for a contractor...finished the job quickly and kept with the quoted price.

Sandy Bee Jones

Contact Us

  • Jeff Mackay Mechanical

    Littleton, NH 03561

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    Call Us
    Phone: (603) 444-6770

    Hours
    Mon: 8:00AM-4:30PM
    Tue: 8:00AM-4:30PM
    Wed: 8:00AM-4:30PM
    Thu: 8:00AM-4:30PM
    Fri: 8:00AM-4:30PM
    Sat: Closed
    Sun: Closed