HVAC reviews in North Billerica, Massachusetts

Bill was thorough and clean during the oil burner tuneup and explained everything. Giasullo Oil Burner Service - I will definitely be using their services again and highly recommend them.

I am thrilled with the job that Mike Giasullo and his great team. Everyone did a great job, insightful, very professional and their commitment to go the extra mile.

I was looking for a new company to service my annual oil boiler heating system. I found Mike’s company, and it was a fantastic experience. The tech arrived on time and was very professional and thorough with the service.

Also, the tech answered all my questions, and the cost was what I expected to pay.

This is now my new oil boiler service team.

Thank you
Brett B

I scheduled an annual oil burner cleaning and was very pleased with the experience. Billy was prompt, professional, and took the time to check all components, replace the filter and nozzle, and cleaned the smoke vent. He also answered a few maintenance questions I had. The system is older but has continued to run well (knock on wood) with the help from the Giasullo team!

After receiving 4 quotes I went with Mike for my oil burner installation. The quote was the most reasonable. Mike and his team were very professional. Mike explained the installation process thoroughly. The installation went smoothly and on time. I'm extremely glad I chose Mike for the job.

Replaced old outdated tank with a new Roth tank. Price was great, work performed was excellent. Wasn't expecting him to travel this far for work. Highly recommend!

Mike is awesome! It's clear that he understands and knows how to maintain systems. He is used for regular maintenance as well as repairs. Always responsive and priorities issues, especially in the hotter/colder times throughout the year.

I cannot say enough about how happy I was to find Mike. He is fast totally dependable honest work whos price is more than fair. Give him a call, you'll be happy you did

Mike is awesome. Between my initial call to Mike and the problem being fixed about 1 hour went by total! Heat is back on just in time for the storm! Huge thank you to Mike

First time we used Mike. They were awesome. On time, efficient and did a great job and reasonable prices.
I'll definitely be using them again. I definitely would recommend him to anyone.

I had an excellent experience with Mike, Dana, and Henry during the replacement of my oil tank. Their professionalism was evident from the initial consultation through to the completion of the project. They maintained a clean and organized workspace, ensured there were no spills, and even left my basement cleaner than it was beforehand. Throughout the process, they were sincere, courteous, and patient in addressing my questions. The quality of their work and their attention to detail reflect a high level of expertise and commitment to customer satisfaction.

I called Mike at 8:00 on Super Bowl Sunday morning. He got back to me in about 15 minutes. He was at my house in about 1 hour and 15 minutes. He got my oil burner up and running. I am very grateful because it is 3 degrees outside right now.

Mike and his team did an excellent job replacing my boiler and furnace. I expected the work to take several days, but they completed everything in just one day. Very impressive work and professionalism.

On time and professional. Great communication letting me know when Bill was on the way. I am sure Bill did a great job and he left the area clean. I plan to use Mike Giasullo Oil Burner Service Inc. next year too.

Mike did a great job cleaning and servicing both of my oil furnaces. He was on time, professional, and very thorough—took the time to explain what he was doing and made sure everything was running efficiently before he left. Highly recommend for anyone needing reliable furnace maintenance or repair!

Absolutely amazing work and responded incredibly fast. Had an emergency with my boiler and Mike was there within 30-40 min to fix the problem. I would a million percent recommend him to anybody and gives a really fair price.

I had scheduled regular maintenance for January 2026, but my oil-fired water heater decided to meet Mike early when its PSI dropped to zero just two days before Thanksgiving. I had been hearing a very loud running-water sound whenever the heater was on. Before Thanksgiving, I took pictures of the heater and emailed them to Mike along with a description of the issue, then turned the heater off.

Mike responded quickly and even tried to come out before Thanksgiving, which I truly appreciated. He came, completed the necessary repairs, and I’m grateful that we were able to enjoy a warm Thanksgiving.

We can't say enough good things about the service we received from Mike Giasullo & team!! Professional, knowledgeable and reasonably priced. This company is the best all around!

I found Mike on the google internet after I read his prior reviews I new Mike was the person I wanted to hire to install our new furance / boiler. His team Dana and Jeff came to start this project along with Mike today 8am to start taking out the old system and putting in the new sytem. They all were very professional and just a honest group of men. They made sure to cover all the flooring so nothing would get damage which i truly appreciated that. Mike made sure if I had any questions or concerns he would stop and answer them. For the size of the sytem we needed in our home he was more than generous with the price we were given. Joe and I would recommend Mike 100 percent we look forward in many years knowing we have someone who will take care and maintain our sytem
Thank you again, Joe and Trisha Lazaro

I had a 35yr old oil boiler that decided to quit on me 1/27. I got a hold of Mike due to the very cold weather that were forecasted for that week he change his schedule around and found a conforto cb boiler. He installed it 1/29. He did a great job installing it and explaining how this boiler would work compared to the old one. I would highly recommended Mike.

Very pleased with our furnace replacement. Mike was very knowledgeable, personable, prompt and professional. The work done was reasonably priced against 6 other quotes. I would recommend this company to anyone and will 100% be using them again.