A white Dempsey Energy van with colorful logo and text for plumbing, heating, and air conditioning—trusted as an HVAC Contractor North Attleboro, MA—is parked on a driveway near a waving American flag and house, with trees in the background.

About Dempsey Energy

Dempsey Energy: Full-Service HVAC and Plumbing Company in North Attleborough

Your property is comprised of several systems to ensure comfort and convenience. However, just like any equipment, major systems such as HVAC or plumbing will eventually require service to keep it working efficiently. If you live in North Attleborough or anywhere in Massachusetts, count on Dempsey Energy for all your heating, air conditioning, heating, and plumbing needs. With over 30 years of experience, our team is highly familiar with the common nuisances and solutions to get your major systems running efficiently again.

To learn more about our broad range of services, give us a call today.

A man in a Dempsey uniform jacket sits next to a woman, showing her something on a tablet—perhaps explaining AC Installation North Attleboro—while they sit together in a bright room with plants and patterned decor.

Our Company Story

Dempsey Energy started in 1992 as an oil company by Law and Nancy Dempsey that employed family and friends. After several years of providing these services, the business was passed on to the next generation of Dempsey. This move created new opportunities such as adding licensed services to customers and indulging in all aspects of home energy services.

We have grown quickly over the last few decades and have expanded our reach of home services and locations where we do business. Originally, we only served the South Shore, but with our continued expansion, we now offer HVAC and plumbing services across a large section of Southeastern Mass all the way to the Greater Boston Area. Call us today to find out if we service your town!

Join Our Maintenance Plan

  • A free annual tune-up appointment
  • 10% parts discount
  • 10% labor discount
  • Priority servicing – Your problems are always at the top of our to-do list
  • 24/7 Emergency Service – We’re always there when you need us

Why Choose Dempsey Energy?

Let’s face it, when it comes to heating, air conditioning, plumbing or really any service company, you have lots of options. Some people rely on online reviews, others on word of mouth or whoever answers the call first. Some even gather info from several companies and then choose.

If we are fortunate enough to have you as a customer, we will treat you like you should be treated—as a partner in ensuring your property is cared for properly. We will work with you to meet your needs and requirements. We will not stop trying harder for you and doing all we can to foster this partnership.

Here are some of the things you can expect from us:

  • Highly trained technicians
  • Team environment with exceptional service every step of the way. From office staff answering the phones to the technicians at your home.
  • Quality craftsmanship for each service with close attention to detail
  • Variety of prices for each level of service to fit any budget
  • Fully stocked trucks for faster repairs
  • Emergency services available 24/7

We Leave Our Customers Smiling

4.6
Excellent 960 reviews
Write a review
Nick Cetola
22 Jul 2026
We used Dempsey for the first time to inspect our HVAC/Central Air Conditioner unit. Our technician was Bob and he did an excellent job with…
Tasgon Andershack
22 Jul 2026
Thank you Eric of Dempsey AC for agreeing to remove my old wall AC and install a new AC 'heat pump' unit where no one…
Robert Sullivan
17 Jul 2026
Charles and Dave just completed an all day job installing a mini split AC Heat Pump unit. It looks fantastic. They were very thorough with…
Mr. D
14 Jul 2026
It was a tankless boiler flushing, the guy came on time, I received a text he was on his was, he did his job quietly…
Laurie Barron
14 Jul 2026
The technician was professional and so informative. He took the time to explain what he was doing and what to expect when I have my…
Edward Beauregard
14 Jul 2026
Quick service, friendly, reasonable, on time!! And tech was knowledgeable
Larry McIntosh
13 Jul 2026
Dan did a great job of servicing my unit and explaining my options for a warranty plan and surge protector upgrade. Running great now!
Darlene McCartin
12 Jul 2026
Dempsey Energy responded quickly when our AC system died. Replaced system in one day under extreme heat conditions. Working a very long day in over…

Ready for 5-Star Level Service?

A man with a beard, wearing a black Dempsey Energy shirt, stands in front of a white van with the Dempsey Energy logo and "Heating," "Cooling," and "Air Conditioning"—your trusted HVAC Contractor North Attleboro.

Dispatch Fee & Cancellation Policy

When an appointment is set with Dempsey Energy we collect a $99 dispatch fee for us to travel to a customer’s home. This covers a 15 minute diagnostic for the technician to assess the source of the problem. If the problem is detected within that timeframe and the client moves forward with the repair, the $99 fee is waived. If the diagnostic takes longer than 15 minutes, the $99 fee will still apply to cover the technicians time and effort.

If the customer cancels their appointment with Dempsey Energy this fee will not be refunded. You can contact our office staff from 8:00am – 4:30pm Monday-Friday.