J.J. Sullivan, Inc. says it has been in business 101 years, and its own site describes delivering fuel and caring for heating and cooling systems. The site names Guilford, Branford, Madison, Clinton, Old Saybrook and East Haven among the towns it serves. Its BBB grade is A+. A 2025 customer who moved to Guilford 25 years ago said they chose Sullivan's as their oil company, became a propane customer too once it started selling propane, and that the company installed their furnace, central AC and mini-split systems. A 2025 customer said J P came out on a Sunday to replace the thermostat even though they had told him it could have waited. A 2025 customer wrote that the company had been reliable for oil deliveries and maintenance and responded immediately to a weekend emergency, making the repairs quickly. A 2025 customer said the company installed a new furnace and praised the workmanship.
Order oilDirect from the company
Pricing not available
We couldn't find a price when we last checked. Call or visit their website for a quote.
“North Branford PNZ says ‘no’ to propane; ruling ends J.J. Sullivan’s quest for facility”
A few years ago I moved my business to JJ Sullivan because of their reputation and I have not been disappointed. They installed a new furnace and the workmanship was outstanding. They respond almost immediately to any inquiry. I am often away from home but I trust them that if I need them to respond they will. Good old New England service from a family business. WAY worth the few extra dollars.
We moved to Guilford 25 years ago and needed an oil company. I chose Sullivan’s because they were family owned, in business for 80 years at the time and Irish. Lol, what can I tell you, it’s the truth ☘️. I’ve never been disappointed by them. Once they started selling propane I became a propane customer too. They’ve installed my furnace, central AC and Mini-Split systems, all working well for many years.
We have always been very happy with our dealings with everyone at JJ Sullivan. J P went above and beyond with the last service call. He came out on a Sunday to replace the thermostat even though we told him it could have waited.
We have always had great experiences with J J Sullivan. Whether we had a billing question or making a service appointment or getting fuel delivery. Everyone we have had contact with has been friendly and courteous and professional.
JJ Sullivan has been very reliable for regular service, oil deliveries and maintenance. But OUTSTANDING in an emergency, as I recently found out the hard way. They responded immediately even though it was the weekend, and made the repairs quickly, efficiently, and with good humor. It’s so great to know I have an oil company I can depend on. Thank You!
Specializes in
Also offers
Service area
Languages
1 change recorded — last scanned Oct 8, 2026.