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Garrison City HVAC-R has 5 stars from 28 Google ratings and an A+ on its BBB page. On its website the company lists a service area that includes Dover, Portsmouth, Exeter, Durham and Rochester, and says existing customers receive priority response for emergency service. A 2026 customer said John installed a new hybrid hot water heater and a full heat pump furnace/AC system in an emergency project, removed all the old equipment, and that the work was clean and organized. That 2026 customer also wrote that John, the owner, came out himself to a two-story home with a temperature battle between floors, and made sure the new thermostats and sensors worked so upstairs and downstairs could be set to different temperatures. A 2025 customer said John kept their heater going and replaced the water heater when it died. A 2024 customer said John disconnected an old gas stove the evening before the delivery, came about an hour after the new stove arrived, installed the "tip prevention" and leveled the stove. A 2024 customer said Kristen made a punctual appointment. A 2023 customer said John helped on short notice when the central heat at their daycare center shut off, replacing several filters and ignition parts. A 2022 customer said John cleaned and tuned their oil burner, spent extra time on an especially sooty burner and did not ask for anything beyond the standard tune-up price. That 2022 customer wrote that John got the flue gases much lower than the tune-up the previous owner had done.
Typical your area range for this kind of work, from regional averages — not a quote from Garrison City HVAC-R. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$5,000 – $11,400
Typical HVAC project around $8,200
UPDATE: 2/10/2026: Just as good the second time around: I can’t recommend John at Garrison City HVAC enough. I just finished a massive emergency project—a new hybrid hot water heater and a full heat pump furnace/AC system—and John was a total rockstar throughout the whole process. I told him what I was trying to accomplish, and he came back with great ideas I hadn't thought of. He’s super knowledgeable and helped me land on the best setup for the house. We had to make a few adjustments on the fly, and John didn’t miss a beat. He was great with the changes and pivoted without any hassle. John removed all the old equipment and the new install looks amazing. The work is clean, organized, and clearly done by someone who takes pride in what they do. If you want an HVAC guy who is honest, fast, and knows his stuff inside and out, John is the one to call. My house is comfortable, the equipment is top-notch, and the whole experience was stress-free. 10/1/2024: Living in a two-story home was a constant temperature battle! We were either shivering downstairs or baking in the upstairs bedrooms. I called Garrison City HVAC and I'm so glad I did! John, the owner, came out himself and took the time to understand the problem. The installation was smooth and professional. John was respectful of my home, cleaned up, and took the time to ensure the new thermostats and sensors worked across all of the systems and apps. Now, I can finally set different temperatures for upstairs and downstairs - total game changer!
John is the best there is. He is prompt, attentive, and gets the job done right. He keeps my heater going and replaced my water heater when it died. If you are looking for someone that will do the job right and also treat you fairly then look no further the Garrison City HVAC. Thanks so much for everything John!!!!
John is professional, proficient and reliable. I trust his judgement and highly recommend him. Kristen will make a punctual appointment and is easy to work with. I'm so glad I found them.
I recently purchased a new gas stove and needed someone to disconnect the old one and then install the new one. My electrician referred me to John LeFebvre at Garrison City HVARC. The issue with this type of service is arranging to disconnect and reconnect around the delivery date and time. John knew I didn't want to be without a stove for long and was very flexible. John showed up the evening (after dinner) before for the disconnect and told me to call him when the new stove arrived the next day. John showed up about an hour after the delivery. He had the necessary parts and even installed the "tip prevention," which I had no idea about. He also leveled the stove perfectly. You know the issue if you have used a stove that was not level(especially with a center griddle). John was highly professional, knowledgeable, and took the time to get everything correct and safe. He is my new HVARC guy.
100% recommended, super knowledgeable w/questions along the way. Good to go with new boiler, best choice for you.
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1 change recorded — last scanned Oct 18, 2026.
Multi-zone heat pump design for older homes5.0
Second opinions5.0
Neat installations5.0
Heating upgrades5.0
Heat exchanger replacement3.6