1. Haffner's Propane & Heating Oil

    1. Haffner's Propane & Heating Oil

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    Exeter, NH

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    Haffner's Propane & Heating Oil

    3.4 (20 reviews)
    Open 8:00 am - 4:30 pm
    Updated 2 months ago

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    7 months ago

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    7 months ago

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    10 years ago

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    6 years ago

    Hartmann Oil was a life saver when moving into our new home. Top notch people and great service I cant recommend them enough .

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    7 years ago

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    7 years ago

    Very easy to work with. I went with Hartmann because of the reviews on line and found them to be accurate. Would recommend to anyone.

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    9 years ago

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    7 years ago

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    14 years ago

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    13 years ago

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    10 years ago

    Have had a Hartman oil for over 15 years. Absolutely excellent service without question.

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    9 years ago

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    Review Highlights - Haffner's Propane & Heating Oil

    I tried 2 other oil companies when we bought our home, the third winter I called Hartmann and have been with them for 13 years now.

    Mentioned in 5 reviews

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    Diamond Mechanical

    Diamond Mechanical

    1.7
    (6 reviews)

    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.

    Haffner's Propane & Heating Oil - hvac - Updated July 2026

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