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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Trusted Brands
Regular Service
Safety Inspections
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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

  • 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