Reviews of local pros in Brentwood, New Hampshire

First time using this company and Curtis was on time and performed work on our mini split. Communicated well thru text on what was going on with the unit. Very cordial well presented, professional. I will definitely use Courtesy Heating and Cooling for future issues.

Curtis, the HVAC Specialist, arrived promptly and was as courteous as the name of the company that provides diagnosis solutions. Throughout the visit, Curtis assured me that my unit would last for the future. I highly recommend using these guys for your heating and cooling needs.

Great experience overall. The team was professional, friendly, and easy to work with. The service was handled smoothly, and everything was explained clearly. I really appreciated their reliability and the quality of their work.

I’d definitely recommend them and would use them again in the future.

Had my boiler serviced couldn’t be happier with the services I got! Curtis is very professional and knowledgeable Id recommend him to anyone for any heating needs! Great price!

Curtis and his team and very responsive & solved problems other heating companies could not! Friendly & efficient. Highly recommend

Curtis from Courtesy Heating & Cooling is incredible professional and responsive. I called them regarding a makeup air problem that I was having with my commercial hood. Curtis immediately responded and began to troubleshoot. I would highly recommend Courtesy Heating & Cooling. Thank you Curtis.

Courtesy Heating & Cooling offers great service and a wide knowledge of heating & cooling needs. When I needed my geothermal AC system worked on Curtis was knowledgeable, thorough and reasonably priced. I HIGHLY recommend them.

Curtis performed an annual heating system service at the beginning of winter and did a great job. He was very informative, letting me know what things I will need to keep in mind for the future. Easy to talk to and does a thorough job at a fair price!

My furnace stopped working twice this winter for two different reasons when it was 10° out. Mike changed His schedule so he could come And fix the problem. That’s One of the things I like so much about Mike… I can Depend on him.

My furnace stopped working on a Thursday night and I found Diamond Mechanical recommended by a trusted friend. I sent them an after-hours message and they responded right away and let me know that they could come to my house the following morning. Mike was on time, and by 9am I had hot water again. He was fast and friendly. I would definitely use this company again and would highly recommend.

Customer's Response to Owners Response:
Nice try! This canned response to the review which pretends they're concerned is only so you can reel-in new customers. If you were truly concerned, you would have answered all my texts and scheduled a call to fix the issue. Instead you went dark on me since October of 2024.

I do not recommend this company. At a high level, they were unprofessional, unresponsive, and unwilling to fix issues they caused. I paid for their service and for multiple follow-up visits, yet the original problem was never resolved. I ultimately had to hire a different provider, who confirmed that the issue resulted from Diamond’s work. I almost never leave negative reviews, but after my experience (and nearly $1,000 in incremental costs) it feels like the only thing to do as the company does not keep promises.

We have asked diamond mechanical to service our furnace since we bought our house back in 2021. Very simple work.I've been told I can do it myself, but I'd rather have a professional do it. I had no issues with diamond through the years until now. Constant reschedules and no replies. Happened three times in the last three months.And once last year...

I'm a very calm and patient person.But when I am leaving my job to come to a scheduled appointment, with no response from you guys, you could probably see the disappointment in my eyes.

Besides this text chain I have shared.I have called dozens of times and have probably spoke to a human once. Also, diamond mechanical doesn't seem to have an office where google says the office is.

My guess is they probably had an emergency call and chose to ignore me because my service would not pay as much as an emergency. I understand that, but a phone call is in order.

Diamond Mechanical did an incredible job swapping out our ancient system with a new and improved propane setup. The team worked fast and was very responsive to any questions we had. There was a mixup with the zones for heating and when it was detected, they got it switched around immediately. 10/10 recommend these guys for any jobs you may have.

The outcome was great. Took too long for outcome to happen. Was not in his control. It was a warranty issue and paperwork was submitted immediately. Took 35 days in the dead of winter to finally get furnaces replaced and running.
Mike was as frustrated as we were. The work Mike did amazing work and once he had everything inline he did it in a timely fashion around Mother Nature. I would recommend diamond mechanical again. He is only one person operation but worth working with. My only issue I had at all was communication during that 35 day period.

I called about noises from our heating system and Mike arranged to come the next day. I was concerned about some components that did not look ok. Mike arrive and confirmed my concerns about 3 valves and the expansion tank. The system was drained, valves and expansion tank were replaced, the system was restarted with no issues. Our heating system has been running smoothly for 3 weeks and there is no noise. Mike explained everything upfront. Work was completed in less than 2 hours and cleanup was great. Diamond mechanical was recommended by our niece and I am grateful I called.