South Glastonbury, CT

Since 1984, Cromwell Energy, Inc. has been delivering quality HVAC installation, heating, and air conditioning repair services to the residents of South Glastonbury, Connecticut.

HVAC Services in South Glastonbury, CT

For more than 35 years, Cromwell Energy has been proudly serving South Glastonbury, Connecticut and the surrounding areas with home heating and cooling services. From central air conditioning installation and repair, to all manner of heating services, our local CT team is here to help. Cromwell Energy also offers heating oil delivery services, and natural gas services in South Glastonbury Connecticut, to suit your needs.

Heating System Installation, Maintenance & Repair

When your furnace or boiler isn’t working properly, you and your loved ones could be left out in the cold—especially in the notoriously frigid Connecticut winters. Fortunately, we offer 24/7 heating system repair CT to have your home heating system working, and your home comfortable again in no time. As part of our heating services, we can even install new furnaces, beginning with a free estimate.

Air Conditioning Installation & Repair Services

Whether you have a central air conditioning system, a ductless unit, or any configuration in between, our HVAC repair technicians in South Glastonbury CT can perform the necessary service and repair you need. If you’ve been considering a new air conditioning system at your home, we also offer installation services to meet your needs. Let us provide you with a free estimate today!

Natural Gas Conversions

Our South Glastonbury team also specializes in natural gas conversion, so if this is something you have been thinking about doing at your home, we’ve got you covered. Allow one of our experienced and friendly technicians to come by and give you a free estimate for converting your home’s existing oil-burning system into a more modern gas-burning configuration. We can also help inform you of the many rebate and financing options currently offered by Connecticut to make affording this conversion much easier on your wallet. Cromwell Energy is a member of the CNG/SNG (UI) and Eversource/Yankee Gas contractor networks.

Home Heating Oil Delivery in South Glastonbury, CT

If you’re looking for heating oil delivery South Glastonbury CT, Cromwell Energy offers this service as well. All of our home heating oil South Glastonbury CT is treated with the HEATDOC additive to maximize efficiency and reduce sludge, so you know your system is getting the quality heating oil it needs. We also offer a variety of South Glastonbury CT home heating oil delivery options to suit your specific needs and budget.

From heating system installation, to oil delivery, to emergency HVAC repairs, our South Glastonbury, CT team is available to provide you with skilled, professional, and efficient service at an affordable price. Contact us today to learn more!

Oil Delivery & HVAC Services

In addition to our heating oil delivery, Cromwell Energy offers HVAC services throughout Middlesex and Hartford County, CT. We offer installation and maintenance services for most major brands of heating equipment (boilers, burners and furnaces) as well as commercial & residential central air conditioning (AC) systems. We also install the highly rated Mitsubishi ductless mini-splits and heat pump systems - which have become a go-to option for many Connecticut homeowners.

Heating Oil Delivery

To ensure that your home receives high quality fuel, Cromwell Energy delivers premium heating oil that contains the state-of-the-art HEATDOC additive package.

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Heating Services

We sell, install and maintain most major brands of heating equipment, (boilers, burners and furnaces) including Burnham, Buderus, Viessmann and American Standard.

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Air Conditioning Services

Cromwell Energy has the experience and expertise to professionally install and maintain your commercial or residential central air conditioning (AC) system.

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Customer Testimonials

At Cromwell Energy, customer satisfaction is always our highest priority. Read some of our many 5 star reviews!

Patrick Meaney

June 6, 2025

Great company for heating oil and HVAC needs. Staff provides excellent service and is very friendly and courteous. I have used them since 2018 and will continue to use them going forward. Can't recommend them enough!

Jen Tine

June 3, 2025

I have use Cromwell Energy for over 20 years and still couldn't be more pleased with the service I received for both my air-conditioning unit and boiler. The team was prompt, professional, and incredibly knowledgeable. They always take the time to explain what was needed to be done, answered all my questions with patience, and made sure everything was running smoothly before they left. Cromwell Energy clearly takes pride in their work and truly cares about their customers. The quality of service is top-notch-from the initial appointment to the final check. It's rare to find a company that's this reliable, respectful, and efficient. Highly recommend to anyone looking for trustworthy HVAC professionals.

Holly Linder

May 31, 2025

Great local company with excellent customer service. We have had Eric service our furnace the last few years and we have been very pleased with his professionalism and timeliness.

J T

May 30, 2025

My 30 year old boiler finally called it quits. I contacted a number of companies for estimates and I found Cromwell Energy to be the most responsive, flexible and willing to work with me. Today, their team of technicians remove the old and installed my new boiler. Once installed they took the time to go over the features. Technicians were neat and professional. Happy to be a new customer

James Henley

May 23, 2025

Great service as usual from Cromwell Energy. Technicians were on time and very effecient. Highly recommend!

Kelly Derosier

December 17, 2024

First time dealing with them. Annual service on a Navien Combi unit installed 2 years ago, they were great would highly recommend!

Joyce Walter

August 6, 2024

Cromwell Electric was wonderful to work with. Jeff gave a clear explanation of estimate for mini split a/c and installation happened within a few weeks (earlier than expected)! Tom, Jason and Ken were extremely professional and friendly. Got work done in a day without interrupting us in the home. Everything was cleaned up and took time showing us how to work the units and care for them. We will continue to use this company for multiple services when needed. A+++.

Lisa Raczka

August 2, 2024

Eric Mori came to do my annual service and he was exceptional! He took the time to answer all my questions, thorough and polite ! I was so pleased and he was neat and timely! He did both my AC and heating!

G - Pops

July 22, 2024

In the middle of a heat wave, our AC quit. Having used Cromwell Energy for furnace maintenance previously, I recalled the excellent service they provided. They did not disappoint again. Even though they were scheduling a week out, a technician became available the next day. Eric was professional, courteous, answered all my questions (and then some), and clearly was an expert in his field. Thanks to Eric and the excellent office staff, our AC stands ready for the next heat wave! Highly recommend Cromwell Energy!!

Nancy Joy

July 18, 2024

Cromwell Energy has always given us excellent service and we highly recommend them!

Barbara Hughes

July 15, 2024

I have used Cromwell Energy for more than 15 years. Eric performed the annual tune-up of my furnace and central A/C. He does a great job of explaining what is being done, was prompt, professional, and experienced. Highly recommend!