Heating & Air Conditioning / HVAC near Andover

“They do Exceptional work. Answered immediately and catered to my specific request at a great price.
Will work with them again 100%“

“Professional, knowledgeable and honest! Dave was just what we were looking for! We are so glad we found cornerstone! Looking forward to working with this company for years to come“

“I don’t often write online reviews, but this experience truly warrants recognition. Shawn recently replaced our water heater, and I couldn’t be more impressed with the quality of his work. The installation was completed efficiently, with great attention to detail, and at a very competitive price.

It’s clear that Shawn is in high demand—and for good reason. I feel fortunate to have secured his services, and I wouldn’t hesitate to recommend him to anyone seeking reliable and professional plumbing work.“

“Well done! Efficient, quick and very professional. Can't ask for anything more.“

“A year ago, my ductless minisplit heatpump system was leaking refrigerant and I couldn't get any HVAC company to properly diagnose the leak... until I found Unique Indoor Comfort. Within 30 minutes of arrival, Chet, one of their top technicians found the leak. I worked with Tom and George, and they had a repair plan in place and in just a few days, my system was repaired and working properly again. No more refrigerant leaks. -- Fast forward to this past week, I needed a new furnace for my house. Again, I worked with Tom and George and spec'd out a new system to exactly meet my needs and priorities. Adis, Curtis, and Bruce showed up and did a fantastic job getting the new system in quickly and cleanly. The things I liked the most about Unique Indoor Comfort are their attention to detail, their solid work, and their excellent communication skills. Everyone in this team listened to me, were very friendly, and made sure my questions/concerns were answered and properly addressed. Top tier service.“

“I recently moved to a new apartment with my family. Although I checked everything deeply before buying, when I started living, I came to know that the heating system was not working up to the mark, I made a call to the home service doctor, and they sent a three-person professional team Freddy, Calvin, and Chris, who checked the system thoroughly and got it repaired. Now the system is working properly. Thanks..“

“Dylan is the best! Very professional, friendly, explains everything even if you ask several times. He is very patient and thorough. Dylan came to help with our air conditioning/air quality system and spent a lot of time making sure to my satisfaction ( I am the one with the sensitive nose) that the air smelled clean.
Dylan was so kind to give my dog Butter lots of pets (Butter if he could write a review would say Dylan is a great guy who gives the best belly rubs and is so greatful that with all his flying fur that he will make the air cleaner and non allergenic.“

“Gas stove starter died and Merrimac Plumbing came the same stay and fixed it.. Great service“

“I woke up to no hot water a few days ago. Excel Mechanical was quick to send Ivan out the next day and tell me what I already knew inside... it was time for a new tank. I picked out a Rheem tankless gas heater at Home Depot then Ivan got to work installing it the next day. He did a great job, beautifully installed!“

“They were able come first thing in the morning and get our gas boiler fixed after it went out overnight. Dave did great work replacing the broken gas valve quickly“

“Had a good experience with Tony and Tashi fixing a gas leak they found the same day. Talked me through the steps and made it a priority and moved calls around to address it. Thanks again.“

“Great service, I had the gas furnace serviced for the upcoming months so I would be ready for the winter. The technician worked on the furnace and checked all the temperatures to make sure everything was working properly.
He checked all the hoses and cleaned the furnace.“

“Sebastian and Raynaldo were hard working responsible experienced HVAC professionals friendly and knowledgeable.
I couldn’t have been more satisfied with their performance.“

“Rob was efficient, friendly, and knowledgeable. He took the time to explain everything in a way in understand.“

“Mike is awesome! Professional, polite, and friendly. I tried to DIY my toilet repair but after getting pretty far down the road decided not to risk making a big mistake and called him. He was super responsive, fixed the problem quickly, and charged me a fair price. I've been looking for a new plumber who will be my plumber from now on, and now I've found him. HIGHLY RECOMMEND!“

“Tony Ramos our technician was prompt, courteous and extremely patient explaining how our system worked. We are new to the HVAC system and Tony answered all of our questions directly and in terms we could understand. Looking forward to seeing him again for our fall maintenance service. Thanks!“

“⭐️⭐️⭐️⭐️⭐️ Excellent Service from CMS Plumbing and Technician Drew! CMS Plumbing recently came out to perform the annual cleaning on our heating system, and I couldn’t be more impressed with the experience. Our technician, Drew, was fantastic — professional, knowledgeable, and incredibly thorough. He took the time to explain what he was doing, answered all of our questions, and made sure everything was operating safely and efficiently before he left. It’s clear that Drew takes pride in his work, and the overall service from CMS was outstanding from start to finish. It’s a great feeling knowing our system is running properly heading into the colder months. I highly recommend CMS Plumbing and especially Drew for anyone needing heating or plumbing services. Reliable, honest, and top-notch workmanship.“

“Quickly evaluated and fixed the problem with my mini-split AC. They are prompt in keeping appointments, as well. I highly recommend Burke and Sons in Haverhill for anyone with Heating or AC problems.“

“After a long day in horrendous heat - high 90’s - John was compassionate enough to add us to his very long list. He fixed the problem, made some suggestions to help extend the life of AC unit and charge us a very reasonable fee! Thank you John!!“

“John came to troubleshoot an issue I had with air in the water lines.
Was quick and clean. Able to solve the issue and explained it clearly.“

“They are top notch. Been using them for cleanings and a couple of emergency repairs. Bailed me out. Just had a new oil tank and furnace installed. Couldn’t be happier. Great crew and very satisfied“

“This review is for an annual maintenance done in September 2025 for mini splits by Daniel Ruiz. He arrived on time, neat and very thorough. Made sure to wear booties inside the house and communicated well with us. He made sure everything was working perfectly and draining properly through our gutters. The one year old compressor had some insulation already splitting so he taped and secured it with some zip ties and took photos of the 12 year old compressors’ insulation that is disintegrating to get a quote to replace. Awaiting company to respond. Daniel is very experienced and highly recommend him.“

“Absolute installed a new Burnham Alpine HE gas furnace and indirect water heater a few months ago. Great job by the team in the work they did and the products they recommended. The site was left very clean and the system is working fantastic. Highly recommended and deeply experienced professionals.

Update: another great visit by Absolute. They came by to address some other plumbing issues we had. Quick communication, professional staff. The work came out great!“

“Andrew from Caron came to diagnose my gas furnace issue. He reviewed what he found and made some recommendations. I will definitely be using Caron it the future.“

“Brian was the technician that came to do my winter tuneup. He was very helpful and very patient with me because I asked him a lot of questions and he took the time to explain things to me. Your company is very lucky to have such an excellent technician. I'm so glad I have a contract with Central Heating And Cooling.“

“Angel was outstanding - efficient, courteous, and answered all our questions about our AC issue and maintenance going forward. I wouldn’t hesitate to recommend Heritage, and Angel.“

“Furnace and A/C compressor were professionally serviced. There is one pending compressor issue to be resolved by next spring and possibly another issue with the furnace (TBD this winter). Outstanding service.“