Heating Oil • Propane • HVAC Services

Reliable fuel delivery and expert heating & cooling service for Southern Connecticut homes.

Become A Customer

My Account

Today's Fuel Prices

OIL

$3.84⁹

Prompt Pay Discount

$3.74⁹

PROPANE

(Whole Home Propane Heating)

$3.59⁹

Prompt Pay Discount

$3.49⁹

Prices subject to change; please call office to confirm your order price. Prompt pay discount applicable if payment is received within 7 days of date of delivery.

Serving Customers Since 1925

J.J. Sullivan provides dependable heating oil, propane, and HVAC services designed to keep your home comfortable year-round.

With decades of trusted service, we deliver quality fuel, expert system care, and reliable support. Our team makes it easy to stay warm in the winter and cool in the summer.

On-time heating oil and propane delivery
Expert HVAC installation, repair, and maintenance
High-quality Bioheat® fuel at no extra cost
Local team available for fast, responsive service

Call Us Today

Join Neighbors First – our exclusive email club for friends, family & neighbors, where you can receive helpful home tips, exclusive promotions and rewards!

Join Today

J.J. Sullivan heating oil delivery services

Heating Oil Services

Get reliable heating oil delivery, expert tank services, and flexible programs that keep your home warm and stress-free.

Learn More

Propane Services

Count on us for reliable propane delivery, tank installations, and service to power your home with confidence.

Learn More

HVAC Services

Rely on our professional HVAC services for efficient performance and dependable year-round comfort.

Learn More

Why Homeowners Trust J.J. Sullivan

We believe your home comfort deserves more than just fuel delivery. Our team combines decades of experience, local trust, and customer-first service to bring dependable heating oil, propane, and HVAC solutions to families across Southern Connecticut.

Play Video

Decades Of Proven Experience

Since 1925, J.J. Sullivan has delivered reliable fuel and HVAC services, building lasting relationships with families across Southern Connecticut.

Reliable Delivery Every Time

Our customers count on dependable heating oil and propane delivery, backed by careful scheduling and accurate service for year-round comfort.

Trusted Bioheat® Fuel Provider

We deliver Bioheat® fuel, an eco-friendly heating oil blend that lowers emissions while providing the reliable comfort your family depends on.

Local Team You Can Count On

Our technicians and drivers live in the communities we serve, providing personalized service with quick, responsive support when needed.

Full-Service HVAC Solutions

Fuel delivery customers receive access to expert HVAC care, including maintenance and installations, available only through J.J. Sullivan.

Customer-Centered Service Plans

We offer flexible payment options, service agreements, and emergency support, making it easy to manage your comfort without added stress.

Become a Customer

What our Customers say

We are proud to support our customers with reliable, trusted home services that keep their families comfortable, safe, and worry-free year-round.

"It's been about 2 months since JJ Sullivan installed a mini split AC/heat pump system in our home, and it has worked perfectly, especially during this recent hot weather... JJ Sullivan is an "old school" oil company and they are there when you need them. There is a reason they have been around for 100 years!!"

- Charles K., Google

"Absolutely Amazing service!! The service technician was knowledgeable and kind and fixed my problem in 30 minutes on a Saturday morning. Highly recommend them."

- Lela Stokes, Facebook

"Excellent service, both for installation and routine service. They have a fast response to emergencies; I had to call them once on the weekend during the holiday season."

- Jennifer Hart, Google

"Last minute propane delivery before major storm will help ensure the generator is working. Fantastic customer service- thank you. If you find other providers don’t try to help you when you need it, as we did with other providers in town, you should switch to JJ Sullivan."

- Darcy Mayo Dugas, Facebook

Latest Projects

From heating and cooling installations to fuel delivery solutions, each project reflects our commitment to quality, efficiency, and customer satisfaction.

AC System Upgrade for Energy Savings in Branford, CT

Customer’s Problem:A customer’s 15-year-old central air system was struggling to cool the home and causing high electricity bills. Our Solution:We...

Whole-Home Propane Conversion in Madison, CT

Customer’s Problem:A homeowner wanted to replace their aging oil system with propane for cleaner burning fuel and more flexible appliance...

Emergency Furnace Replacement in Guilford, CT

Customer’s Problem:A longtime customer’s furnace failed during a cold snap in January, leaving their home without heat. Our Solution:We quickly...

View More Projects

Stay Comfortable Year-Round

From reliable fuel delivery to expert heating and cooling service,
J.J. Sullivan is your trusted partner for home comfort.

Request Service

Latest Articles

Stay informed with our latest blog posts featuring home comfort tips, seasonal maintenance advice, fuel price updates, and energy-saving ideas. Whether it’s heating, cooling, or fuel delivery, we share insights to help you get the most from your home’s systems year-round.