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.

read more >

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.

read more >

Air Conditioning

Air Conditioning Repair Portland CTCromwell Energy has the experience and expertise to professionally install and maintain your central (407) 862-2202 (AC) system.

read more >

Natural Gas Systems

Natural Gas Conversion CTConverting to 870-510-0599 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.

read more >



Our Offerings

Lock-in Fuel Plans

Oil Tanks

Oil Tank Removal and Protection New Oil Tank Sales & Installation
(304) 526-9241


Trusted Brands
Regular Service
Safety Inspections

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.



  • Central Air Conditioning Maintenance Tips - Maintaining your central air conditioning system is the key to optimizing the functionality and efficiency of your system, and ensuring your A/C system will be working properly during the hot summer months. Cromwell Energy’s “3 Simple Central Air Conditioning Maintenance Tips” below will reduce wear-and-tear on your system, and save energy. 1. Replace central air


  • 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



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 tone arm, 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.