I have been using Key for annual maintenance of our split units for the past couple of years and…read morethey are fantastic. Always reliable, easy to schedule, and reasonably priced. Also, shout out to Justin Mccallion, our Key technician who not only did a great job, but also smelled a gas leak on the outside of our house for which Eastern propane shot right now and fixed. Soooo, thank you for that and great job!! :)

Matthew was very polite and went the extra mile to get the correct equipment installed. Great to…read moredeal with.

Brian was a pleasure to deal with. He arrived on time and answered the many questions I had. He…read morewas very knowledgeable and I will be contacting them for future services.

I would like to say these guys are 5 stars in my book ! I had to replace my whole heating system…read more I called for 4 quotes. Simmons was one of the best experiences I had with there salesman. there was no " my boss needs biz in that area , just a one time honest quote ! I went with Simmons and all I can say is, from my experience with them was Awesome ! In my opinion there the Best on the seacoast ! Harry J. M

Louis Sbrizza. Louis and his partner just left my house. I…read moredidn't have air-conditioning.... I do now. They were friendly and professional. They offered some unsolicited recommendations with zero pressure. Bottom line- good experience and I would recommend Pettigrew... I don't want to forget the folks on the phone who were pleasant and helpful as well

In my opinion, maintenance service was substandard as problem was not noted or addressed. In my…read moreview, value was not there either with certain quotes well above leading local contractors. I do not recommend.

Always great, professional service. Friendly, thorough, conscientious and done right the first time!read more

Best for sales, service, and installation. Just finished installing new furnace and added AC…read more Fair pricing, Great Service and Install. Team works hard to not be in the way while doing their job. They know what they are talking about and can be trusted to do the job right.

I'm very happy with their oil service. However I am very unhappy with their furnace service. I had…read moresomeone come out because my furnace Wes making a racket. guy comes in says there is nothing wrong with your furnace it's the batteries in your thermostat. changed the batteries adjusted the flame and he left. O e week later I have key come. ThDre is a while I. my heat extender so they red tag it. thankfully I was able to get someone to replace my furnace within two days. I emailed haffners and never heard back. I will never use their furnace service again

We switched an oil account to Haffner/Energy North from another local provider. We also had them…read moreinstall a new Oil furnace/boiler. While oil delivery service has been satisfactory, the install was overpriced and raised questions about the integrity of Haffner's/Energy North. We had a proposal from our former dealer to install a Buderus boiler based system. I asked the Haffners team for a proposal and price to install a system of equal quality and especially efficiency. Haffner's proposed to install a Peerless boiler based system. In multiple discussions, that system was represented to be of the same quality and efficiency as the Buderus. Those representations proved to be not accurate. I later learned that while Peerless is a very well regarded brand, it is of lesser quality and lower efficiency than the Buderus. This first came to light when one of the Haffner's technicians who installed the Peerless system acknowledged those facts in conversation after the install. I was very disappointed and immediately raised concerns about the inaccurate statements and the lack of value in what Haffner's had installed. They "met the price" of the Buderus proposal [their original price was higher for the Peerless system]. When I challenged Haffner's supervisory staff, they offered a $100 dollar price accommodation. Given the discrepancy in value and efficiency, that did not begin to make up for the inaccurate statements we relied on in accepting their proposal. This was a system for a 95 year old widow, they should have been more honest. I ultimately spoke with a neutral party about the comparison between the two boilers - a 30+ years in the business plumbing and heating professional who has worked in my home [the system at issue was for my elderly mother] for two decades. He said while Peerless is a good quality unit, it is not at the level of the Buderus. He said in his entire career, he never had experienced a defect in a Buderus device. He also explained the difference in efficiency. In the peerless boiler, heat is transferred in a single pass around a heated chamber. The medium to be heated in the Buderus system passes three times, transferring more heat for each unit of oil burned. That information only increased my disappointment with what Haffner's's/Energy North represented to me and how they treated my mother once the inaccuracies and unfairness were brought to their attention. Conclusion: Good service and low oil prices. But pay attention to what is represented about equipment quality and efficiency. In retrospect, we should have stuck with the competing local dealer and installed the Buderus based system.

All I want to do is write a great review. That would mean I'm happy with the results. I can't do…read moreit. After the expansion tank was added and adjusted on the hot water tank my washer and dryer have to be squeezed back into place, pipes have to be pushed out of the way to make the washer and dryer to fit. I'm going back downstairs to attempt to rectify this situation. I'm not happy that I have to do anything at all. It cost me enough. Would I recommend Heritage Home Service? No is the short answer...

Was told over the phone a plumber was coming out to do "maintenance" on a POE water tank…read more However, turns out these units don't get maintained, but replaced. Still not sure whether unit even needs to be replaced after visit. Not sure this was worth $270, especially being a repeat customer.

I hardly ever write reviews but I wanted potential customers of this HVAC contractor to be aware of…read moremy experience. This is a long story and wouldn't fit here so here's the summary of my experience; Most issues were resolved but I still have a vibrating/rumbling furnace which Mike never scheduled to look at. Mike's demeanor and interaction with me via text and in person seemed to change the more I reported issues with the installation and asking to be kept informed on status. I had to resend texts and still received either no response or responses days/weeks later. He does not know how to communicate or treat his customers courteously. I understand that he was having knee problems that led to surgery, but he should have told me earlier and provided status at different points. You can text someone even if your laid-up in bed. I never knew if he had ordered repair parts or when he was scheduled to come out to make the repair. He probably shouldn't have even taking the job since he was a one-person company and had no-one else in his company to send out. Most issues were resolved but I still have a vibrating/rumbling furnace. Problem Number 1; Mike the owner of Diamond Mechanical should have made sure that the new furnace would fit in the existing space. Problem Number 2; On the day of installation I found out Mike was out on medical. Different contractors showed up for the job. Diamond Mechanical consisted of one person (Mike). Problem Number 3 (related to Problem 1: The furnace was a too big in height to fit. They didn't look into swapping the furnace out with one that fit. The installation should have been stopped and never attempted since the new furnace was too big to fit. Another furnace that fit should have been ordered and installed. Problem Number 4; On the second and final day of installation, the old control panel was no longer working. The sub-contractor managed to rig it up to give us heat. Problem Number 5; I ran the furnace (both for heat and A/C) for a few months. I did notice that the furnace was vibrating or shaking when the fan ramped up to speed when calling for heat or AC. I didn't report this to Mike until Oct. 8th because I didn't want to be without A/C in the hot summer months. Problem Number 6; I found out that the Fan wire coming from the control panel was no longer connected at the thermostat end. I reconnected it myself. I never reported this to Mike. Problem Number 7; On Oct 8th, 2024, water was leaking inside the furnace from a drain connector. On Nov. 1st, I asked Mike for status on the drain connectors. He notified me on Nov. 4th that he had been out for 10-days with knee surgery. I said I understood but he seemed upset when I told him he could have let me know so I wouldn't think nothing was being done. Mike installed a new drain connector on Nov. 4th at no charge. Problem 5 again; On Oct. 8th, 2024, I also reported via text to Mike that I noticed that the furnace was vibrating or shaking when the fan ramps up to speed when calling for heat or AC. On Feb. 15th and 20th I resent the text about the vibrations but got no answer. Feb 26th, asked again for help. Feb 27th, Indicated by text that I said no rush and schedule for end of March. Never heard back. He knew I had this problem and it was on him to reach out and schedule a troubleshooting visit. Haven't heard back as of (12/13/25). Seems like he was fed up with the issues I was reporting to him as a Bryant Dealer/Service Contractor. Reached out one more time by text on Jan 2nd, 2026 and still no response. On Feb.15th and 20th I resent the text about the vibrations but got no answer. Feb 26th, asked again for help. Feb 27th, Indicated by text that I said no rush and schedule for end of March. I thought he was going to get back to me with a day/time to come out and take a look. Never heard back. He knew I had this problem and it was on him to reach out and schedule a troubleshooting visit. Haven't heard back as of (12/13/25). Reached out one more time by text on Jan 2nd, 2026 and still no response. I'm giving up and will have a more reputable HVAC contractor come out at my expense to figure out why my furnace vibrates and rumbles the floor and walls.

I had a very bad experience with this company a few weeks ago and I'm still waiting for the owner…read moreto call me back to correct the issue. I would definitely not recommend them.