Middlefield, CT

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

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HVAC Services in Middlefield, CT

Are you searching for a top-quality HVAC company in Middlefield, CT? Look no further than Cromwell Energy. Since 1985, we have proudly served Middlefield as the premier AC installation and heating company in CT. Cromwell Energy’s licensed and insured professionals have significant experience in multiple HVAC services, including furnace and heating system repair, air conditioning repair, natural gas conversions, and heating oil delivery.

Heating System Installation, Maintenance & Repair

During the cold New England winter, it is crucial to have a reliable and efficient heating system. Cromwell Energy installs (and maintains) the top brands of boilers and furnaces on the market, including Biasi, Buderus, and IBC. We also provide 24/7 service, so you never have to worry about being left in the cold! Cromwell Energy is also one of the premier ductless heating and cooling companies in Middlefield, CT. Our top-rated LG and Mitsubishi ductless systems will keep you warm in the winter and cool in the summer!

Air Conditioning Installation & Repair Services

If your air conditioning system fails in the height of summer, you’ll need a reliable HVAC contractor to fix it as soon as possible. Our AC repair technicians have experience with all types of AC systems, allowing us to complete your repair quickly and efficiently. We use top-rated brands including American Standard, Mitsubishi and LG.

Cromwell Energy offers full-service air conditioning service and repair, from minor fixes to full installations. Our experts will visit your home for a careful consultation and outline your repair options. We are available 24 hours a day for your AC repair emergencies, so you never have to worry about being stuck without air conditioning.

Natural Gas Conversions

If you are looking to convert your system to natural gas, look to Cromwell Energy for help. We are a top natural gas conversion company in Middlefield, CT and can provide a thorough, efficient consultation for the best conversion possible. We will analyze your current system to determine the best and most cost-efficient way to transition your home to natural gas.

Cromwell Energy is a proud member of the CNG (UI) and Eversource contractor networks. The strict standards of these networks ensures that you will have a top-rated contractor working on your conversion.

Home Heating Oil Delivery in Middlefield, CT

Do you need home heating oil in Middlefield, CT? Cromwell Energy offers oil delivery to homes in the greater Middlefield, CT area. We have a variety of flexible oil delivery plans to fit your budget and schedule. Cromwell Energy also uses the HEATDOC premium heating oil conditioner, for cleaner fuel, less corrosion, and reduced sediment.

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