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Why Choose Dempsey Energy?

Full-Service HVAC, Energy & Plumbing Experts

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 Mansfield or anywhere in Massachusetts, count on Dempsey Energy for all your heating, air conditioning, oil delivery, and plumbing needs. With over 25 years of experience, our team is highly familiar with the common nuisances and solutions to get your major systems running efficiently again.

Dempsey Energy is looking forward to showing you how much our company has grown and changed for the better. Allow us to be your go-to service team and we will do everything we can to be worthy of your trust.


Same Day Service Available

CALL TODAY 617-997-4310

About Us

The Right Technicians, The Right Company


Do you need a professional technician for your plumbing, heating, or air conditioning system? Available 24/7, our team at Dempsey Energy can help. We provide oil delivery and other energy services as well. Call today for same day service. Always a live answer.

617-469-4144

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OUR SERVICES


Servicing Plumbing, Energy, Heating & Cooling Needs


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 Massachusetts or Rhode Island, you can count on Dempsey Energy for all your heating, air conditioning, oil delivery, and plumbing needs. Our team has over 25 years of experience to keep your systems operating at full capacity for years to come.

Call: 617-997-4310


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You Can Count on Our Service Professionals


Award-Winning Service

24/7 Emergency Services

Top-Notch Workmanship

Clean-Cut, Professional Technicians

High-Quality Workmanship

Fast, Same-Day Repairs

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Our technicians are ready to help! Get in touch with us by calling the number or filling out the form below

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Our Happy Customers!


Very professional and courteous. Best price with the best quality of both products and services. Iā€™d highly recommend Dempsey Energy to anyone.


Chris, the tech who came out, and the people at Dempsey have been amazing. They came out quickly and Chris took the time to explain everything to me and help calm my anxiety. When an additional problem popped up right before the 4th. Chris was there bright in early to make sure my A/C was working properly despite the holiday. This is definitely a number I will be saving for future issues.


Just had my furnace and air conditioner replaced. They were both 30+ years old. I was so impressed with the hard work that Tim put in to get my heat working after the old furnace died. He went above and beyond my expectations! He left the basement cleaner than when he arrived. It was a big job, and Tim did it with very little break time...not even sure he ate any meals while working 10 hr days. I was so grateful to have such a nice guy working here.


Dempsey Energy was GREAT! Although there are those who have posted negative reviews of Dempsey Energy, I was completely unable to get ANYONE ELSE to come for a furnace cleaning and checkup. Dempsey responded immediately, showed up EARLY, and did a superb job on my system. The technician was courteous, and left the area cleaner than when he arrived. The price was the same as I had paid someone else over 5 years ago. After the visit, I called their office for the receipt, and it arrived within a few minutes!


I am a former customer of Dempsey, and i have to say their oil service and service plan was wonderful. I'd like to thank them for treating me wonderfully over the two years I lived in a place with an oil tank. If I ever move into another place which has oil heat, you will be the first ones I call. THANK YOU!!!


We needed a new central air system (two condensers, two air handlers and two hydronic coils). Eric Dempsey came out and went over the different product lines, their pros and cons. He was informative and helped us make a decision (we went with Trane). They started the project shortly thereafter. Roy (chief technician) did a great job with the installation and Don (Project Manager) stayed on top of everything. The work was done professionally, the system was tested thoroughly and they cleaned up their work areas when they were finished. We are very confident that we selected the right firm for the job.

See why we are the best!

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Home – Dempsey Energy

Seasonal Special:

Furnace Safety Inspection ā€“ Only $39.50

Seasonal Special:

Furnace Safety Inspection ā€“ Only $39.50

$57 OFF

ANY SERVICE CALL

Does not apply to dispatch and/or diagnostic fee.

View More Specials

Request Your Appointment Today!

Our plumbing technicians are ready to help! Get in touch with us by calling the number or filling out the form below

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