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Typical your area range for this kind of work, from regional averages — not a quote from Marathon HVAC. 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
Marathon HVAC describes itself as a New Hampshire based heating, air conditioning and controls contractor, says it has been in business for 30 years, and lists a service area that runs from Rochester, Dover and Somersworth to Laconia, Conway and Portsmouth. Its New Hampshire HVAC licence, MBE2601859, is active on the state registry, held by Marathon HVAC, LLC. The Better Business Bureau grades it A+. A recent customer who had several mini-split units installed said the project took several days, as expected for a job of that size, and that the team showed up when scheduled and worked late into the evening to finish each day. When that customer needed something checked a couple of days after completion, Marathon came out the same day. The same customer got quotes from several other companies and said Marathon's pricing stood out. A recent customer said Keith explained the available options, worked with them on a system that met their needs and then installed it. In a 2025 review, a customer said their mini-split stopped producing heat as it started to frost, and that Keith, their technician, came by on a weekend and got it fully operational in just under an hour for under two hundred dollars. That 2025 customer said he explained what happened, what he did to fix it and preventative maintenance, with pictures and a full walk-through. A 2025 customer said Keith was brought in on a very complicated residential system after numerous contractors had walked away, and fixed the problems rather than selling a replacement heating system that some quotes put in the low six figures. A 2025 customer said Keith replaced their water heating system and noticed a problem with the old propane exhaust pipe, which he made safer. A 2024 customer said Keith arrived on time and quickly got to fixing their gas line leak. A 2024 customer said Keith worked on their propane furnace and central air. A 2024 customer said Keith was done in the time period he said he would be, with no surprises.
We recently had Marathon install several mini-split units in our home, and we couldn’t be happier with the entire experience. The project took several days as expected for a job of this size, but their team was incredibly professional from start to finish. They were always punctual, showed up when scheduled, and worked late into the evening to make sure the job was fully completed each day. The technicians were kind, knowledgeable, and genuinely helpful — they took the time to explain everything, answer all our questions. What really stood out was their pricing. After getting quotes from several other companies, Marathon’s price was unbeatable while still offering top-tier work. Their service is what truly sets them apart. Just a couple of days after completion, we needed them to come back and check on something. They were able to come out the same day — no hassle, no waiting. That kind of responsiveness is rare. If you’re considering mini-split installation or any HVAC work, Marathon delivered outstanding quality, fair pricing, and the best customer service I’ve actually ever experienced. Highly recommended! Thank you, Marathon team!
Keith did an excellent job explaining the available options and working with me to get a system that met my needs. He did an excellent job installing it and his attention to detail and professionalism was outstanding.
Had some issues with our Minisplit system no longer producing heat right as it started to frost. Keith, our technician, came by on a weekend and got us fully operational in just under an hour and under two hundred dollars for a complex system, he was able to explain what happened, what he did to fix it, and preventative maintenance for us for future along with pictures and a full walk through. Keith is awesome, Marathon has a long term minisplit customer from us.
Keith did a wonderful job replacing our water heating system. He noticed a problem with the old propane exhaust pipe and went above and beyond to make it more safe. He was always on time, easy to communicate with, and kind to my kids. And his prices can’t be beat. Five stars all the way!
Keith was brought in to resolve major issues with a very complicated residential system after numerous contractors had walked away from the project. He studied the system and came up with cost effective and reliable solutions to make the system viable again. Keith could have sold an expensive replacement heating system ( low six figures were some quotes ) but he took the hard route and fixed the problems. And he has always been available to answer questions by text or call. His invoices were always fair and honest. I highly recommend his services.
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1 change recorded — last scanned Oct 18, 2026.
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