Portland, CT

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

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HVAC Services in Portland, CT

For over 35 years, Cromwell Energy has provided premier, top-quality air conditioning and home heating services to Connecticut residents at an affordable price. Our technicians are fully licensed, highly experienced, and trained in innovative HVAC technologies.

Our team in Portland, CT, is prepared to provide you with top-notch services, including home heating oil delivery, air conditioning and heating system installation and repair, and HVAC system upgrades.

Heating System Installation, Maintenance & Repair

If your heating system fails in the middle of a freezing winter, it is important for you and your family to find the most reliable and cost effective heating system repair service. Our Portland, CT, heating professionals are on call to perform emergency repairs to your furnaces, burners, and boilers, 24 hours a day, seven days a week.

In addition to repairs, we sell and install heating equipment from major brands such as American Standard, Biasi and IBC. Our Portland, CT, heating services include free price estimates for the installation of new equipment. We also provide equipment maintenance and expert recommendations to improve your heating system.

Air Conditioning Installation & Repair Services

Cromwell Energy’s cooling specialists have extensive expertise with repairing, installing, and maintaining HVAC systems in Portland, CT. Our air conditioning experts can help you with any issue on all brands of central air and ductless heat pump systems.

We provide regular maintenance, new equipment installations, and emergency repairs to keep your HVAC system up and running year-round. We will evaluate your HVAC system and provide recommendations for optimal system efficiency.

Natural Gas Conversions

Cromwell Energy provides natural gas conversion services to Portland, CT, residents. If you are considering making the switch from oil to gas, our specialists will visit your home and provide you with a free quote.

Cromwell Energy participates in the Eversource and CNG/SNG contractor networks. The state of Connecticut provides many rebate and financial incentives for Portland, CT, residents who switch from an oil-burning heating system to a natural gas one – use Cromwell Energy to begin your transition today!

Home Heating Oil Delivery in Portland, CT

If you use home heating oil in Portland, CT, it is important to use high quality, trusted fuel. At Cromwell Energy, we treat our state-of-the-art home heating oil with the HEATDOC additive to bolster efficiency, combat corrosion, and dissolve undesirable sludge. This will ensure that your Portland, CT home heating oil system will run at peak performance!

Your Cromwell Energy our delivery specialists are trained, licensed and insured. We offer several oil delivery options in the Portland, CT, area to fit your budget and heating needs.

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