CT Fuel Oil Delivery, HVAC Services & Natural Gas Systems


Fuel Oil Delivery

Fuel CT Oil Delivery CromwellTo 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 Systems

Home Heating Systems Rocky Hill CTWe 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

Air Conditioning Repair Portland CTCromwell Energy has the experience and expertise to professionally install and maintain your central air conditioning (AC) system.

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Natural Gas Systems

Natural Gas Conversion CTConverting to natural gas has become a viable alternative for many homes in Connecticut, and Cromwell Energy has extensive expertise in the installation and repair of natural gas systems.

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Our Offerings

Lock-in Fuel Plans

Oil Tanks

Oil Tank Removal and Protection New Oil Tank Sales & Installation
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Maintenance Contracts


Cromwell Energy works with manufacturers, utility companies, and the federal government to offer rebates and tax incentives for installing high efficiency heating and cooling equipment.

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Our Blog

  • Do-It-Yourself Repair Considerations - Do-it-yourself (DIY) projects always seem like a good idea at first. It may be tempting to try it yourself when it comes to heating, ventilation, and air conditioning (HVAC) repairs and maintenance. After all, there are countless YouTube videos and other self-guided materials on the internet that are enticing for anyone wanting to save money


  • Thank You! I just want to thank you for such great customer service. Technicians came out within an hour from my call and found the issue. They also imparted knowledge so that I will know the first steps to take in the future. I am very happy with the service received from Cromwell Energy.   -Chris E. Rocky Hill, CT
    Chris E.
  • We want to extend a big warm THANK YOU for all of your exceptional service. We know the job turned out to be trickier than most, and we really appreciate your professionalism and desire to make our system work smoothly. It was clear you all understood the finer points of working with the single-pipe steam monster – your experience was really appreciated! We’d happily serve as references for any future clients who want to know what it is like to work with Cromwell Energy – a super company and crew! Thanks again.   -Joe B. & Clare R. West Hartford, CT
  • My husband and I want to thank you for the amazing job you did replacing our furnace. The entire Cromwell Energy staff is always polite, professional, and highly skilled at what they do. What a pleasure it is to see a company so dedicated to its customers. We will continue to recommend Cromwell Energy to family and friends.   -Lucy H. Rocky Hill, CT
  • Your courtesy, promptness, trustworthiness, and excellence are a great comfort to me. I am very grateful.   -Richard D. Cromwell, CT
  • As you are aware the installation project has been completed at our home. Your staff spent eight days at our house and certainly worked very diligently and with outstanding work ethic. We are sure you are aware of the kind of work accomplished by these fine workers. Aside of their ability they are polite, helpful and cleaned up at the end of each day. Hats off to a good experience by Cromwell Energy for us.   -Bill & Valerie E. Cromwell, CT
  • I would like to tell you Thomas, the man you sent to fix the furnace is an excellent worker. He did a beautiful job. You are blessed to have him. He left the cellar very clean. -Mrs. S.
  • On Monday night, January 28, about 9 pm I noticed that my thermostat was getting lower and lower. I called your company, explained my situation and was told I would see someone within the hour. In came Jason. He checked the thermostat and then went down to the furnace. He was there for some time. Then he came up he said my problem was the furnace transformer. Jason is an excellent member of Cromwell Energy. He knows his job well. He explained what had happened and fixed it. He is a credit to your organization. I consider myself to be fortunate to be with Cromwell Energy. Thank you. -Mrs. M
  • During the recent hot & humid August weekend, our central air conditioning unit stopped working.  We called around to several dealers & servicing companies and we were unable to find anyone to come and take a look at our unit in the near term.  We called Cromwell Energy first thing on Monday morning and you were so kind to find a way to have someone come out that same day to take a look. (even though we were not current customers).  Thank you so much.   With the excellent investigation and repair work of Taylor, our air conditioning was back up and running later that day.   This was such a relieve to us and to our 14 year old dog. Please consider us a customer going forward! Thank you. Steve & Jody


Why Choose Cromwell Energy

We Are One of The Top HVAC Contractors in CT

Whether you are looking to upgrade your HVAC (heating, ventilation, and air conditioning) system, or you would like to maximize on the efficiency of your current system, depend on Cromwell Energy for your heating and cooling needs. As a top HVAC contractor in CT, you can relax knowing that our licensed and insured technicians have your best interest in mind.

We install and repair all of the top manufacturers of boilers, burners, and furnaces, and our team will provide expert HVAC installation in CT to make sure your family is comfortable all year long. If you are unsure what type of heating system you want, we can make recommendations based on your home setup, your priorities, and your budget. As a boiler and furnace contractor, we also offer oil and gas maintenance plans that give you priority service and ensure your heating system is safe and efficient.

When it comes to AC installation in CT, our cooling specialists are available to help evaluate your needs and recommend the best cooling system for your home. As your Connecticut central air contractor, we also provide an air conditioning maintenance plan that includes an in-depth, 15-point system tune-up, as well as service discounts and priority service.

Superior Oil to Gas Conversions in CT

Cromwell Energy is a leading expert for oil to gas conversions in CT. We are a participating vendor in the CNG, SNG and Eversource contractor networks. For gas conversions in CT, few are more dependable and experienced than Cromwell Energy. We can assist with all gas conversions, as well as providing upgrade options for your current system. Our natural gas maintenance plans provide a full safety check and an annual tune up, as well as priority service and discounts on any service work.

If your home’s energy source needs an upgrade or repair, call upon one of the best HVAC contractors in CT and see firsthand how we can exceed your expectations.

Fuel Oil Delivery in CT

When it comes to oil delivery companies in Connecticut, all companies are not all created equal. At Cromwell Energy, we go the extra mile to make sure that your heating oil is delivered on time and to your specifications. Our oil delivery drivers follow strict protocols to ensure the safety of your home and family, and they always treat your property with the utmost respect.

Additionally, we have some of the best heating oil prices in CT, with lock-in fuel plans to manage your home heating oil costs. Our heating oil is also treated with the HEATDOC additive package to keep your heating system operating at its peak efficiency, with less damage and corrosion over time. When it comes to oil prices in CT, you can’t beat the quality of our oil at a comparable price.