Rocky Hill, CT

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

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HVAC Services in Rocky Hill, CT

For over 35 years, Cromwell Energy has built a reputation as one of the most reliable heating and cooling (HVAC) contractors in Rocky Hill, Connecticut. Not only are we dependable, we provide quick HVAC service around the clock, and always at a fair price. Our goal is your complete satisfaction, and we will go above and beyond to ensure your Rocky Hill HVAC system is operating at its best. From basic heating and conditioning repairs, to oil deliveries, to full HVAC system upgrades, our contractors will combine their extensive experience with the newest technologies to exceed your expectations.

Heating System Installation, Maintenance & Repair

We understand how important your heating system is to the well-being of your family, which is why we are available 24 hours a day, 7 days a week. If your boiler, burner, or furnace breaks down, we will be there to get it up and working. Additionally, our Rocky Hill HVAC team can provide recommendations to improve the efficiency of your existing system, or provide a free estimate to upgrade your system.

Air Conditioning Installation & Repair Services

When it comes to keeping your home cool, you want an HVAC system that is dependable and efficient, and at Cromwell Energy, that’s what we do best. Our cooling specialists in Rocky Hill, CT have extensive experience with all brands of HVAC systems. No matter what make or model you have in your home, we can diagnose the problem and get your system back on track. Cromwell Energy also installs high-efficiency ductless systems in Rocky Hill, ensuring that any home can have the comfort of air conditioning.

Natural Gas Conversions

Cromwell Energy has extensive experience in converting homes in Rocky Hill from heating oil to natural gas. We are participants in the CNG and Eversource contractor networks, and are well-versed in the gas company processes. We also know the zoning regulations in Rocky Hill, and can help you navigate the complete conversion process. Converting to natural gas can be a cost-effective improvement for many homes, and Cromwell Energy can provide a free conversion estimate to see if it makes sense for your home.

Home Heating Oil Delivery in Rocky Hill, CT

If your heating system is dependent on oil, then you know how crucial it is to use high-quality heating oil. At Cromwell Energy, our heating oil has the HEATDOC oil additive that actively dissolves sludge and prevents corrosion, ensuring your fuel source stays stable. We also offer Rocky Hill, CT residents with a variety of payment options that allow you to spread out your heating oil costs over a full year instead of having to pay for all of the oil during the colder months.

From heating system installation, to oil delivery, to emergency HVAC repairs, our Rocky Hill, 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!