Marathon HVAC provides fast, professional air conditioning repair and AC installation in Rochester, NH and throughout the Seacoast and Lakes Region. Whether your system is not cooling, making noise, leaking, or failing to keep up during hot weather, we provide honest diagnostics and reliable repairs with no hidden fees. We proudly serve homeowners and commercial properties in Rochester, Dover, Somersworth, Wakefield, Farmington, Alton, Meredith, Laconia, Conway, North Conway, Sanbornville, Moultonborough, and Wolfeboro.
When your air conditioner is not cooling properly, short cycling, leaking water, or making unusual noises, professional diagnosis is critical to prevent further damage. Marathon HVAC provides reliable AC repair in Rochester, NH and surrounding towns, servicing central air systems, heat pump cooling systems, and ductless mini-split units.
Common air conditioning problems we repair include electrical failures, refrigerant leaks, frozen evaporator coils, airflow restrictions, thermostat issues, and failed capacitors or contactors. Our goal is to restore cooling quickly while giving you clear options if repair versus replacement should be considered.
In addition to cooling service, we also provide comprehensive heating repair in Rochester, NH for furnaces and heat pump systems to keep your home comfortable year-round.
When repairs are no longer cost-effective or your system is nearing the end of its service life, Marathon HVAC provides professional air conditioning installation and replacement in Rochester, NH and surrounding areas. We install properly sized, high-efficiency central air conditioning systems and heat pump cooling systems designed to improve comfort while reducing energy costs.
Every installation includes correct equipment sizing, proper refrigerant charging, airflow verification, and full system commissioning to ensure your new AC system operates safely and efficiently. We take the time to explain your options clearly so you can make an informed decision without pressure or upselling.
Ductless mini-split systems provide efficient air conditioning for homes without ductwork, room additions, finished basements, and spaces that are difficult to cool with central air. Marathon HVAC installs and services single-zone and multi-zone mini-split systems throughout Rochester and the Lakes Region, offering quiet operation and flexible temperature control.
Mini-split systems also provide high-efficiency heating, making them a year-round comfort solution for New Hampshire homes. To learn more about ductless system layouts, efficiency benefits, and installation options, visit our Ductless Heat Pump Systems page.
Routine air conditioning maintenance helps prevent unexpected breakdowns, improves indoor air quality, system efficiency, and extends equipment lifespan. Marathon HVAC provides professional AC tune-ups in Rochester, NH and surrounding towns to keep your system operating safely and reliably during peak summer demand.
Our maintenance services include cleaning condenser and evaporator coils, clearing condensate drains, inspecting electrical components, verifying refrigerant levels, testing safety controls, and confirming proper airflow. Identifying small issues early helps avoid costly emergency repairs and improves overall comfort.
Homeowners and commercial properties choose Marathon HVAC because we focus on quality workmanship, honest communication, and reliable local service:
• Owner operated local business — no subcontractors
• Licensed and insured in New Hampshire
• Clear diagnostics and straightforward recommendations
• No hidden fees or unnecessary upselling
• Respectful, professional service in your home or business
Marathon HVAC proudly provides air conditioning repair, installation, and maintenance throughout Rochester, Dover, Somersworth, Wakefield, Farmington, Alton, Meredith, Laconia, Conway, North Conway, Sanbornville, Moultonborough, and Wolfeboro, NH. If you are located nearby and do not see your town listed, contact us to confirm service availability.
Thinking about an energy-efficient ductless system to heat and cool your home? Rebates from NH Saves make upgrading to high efficient heating equipment even more appealing—you’ll save money while helping the planet.
Qualifying installations can earn up to a $1,900 rebate for our NHSaves utility partners. And with Marathon HVAC handling every detail, all you have to do is sign the paperwork and wait for your check!
• Furnace Repair & Installation • Boiler Repair & Installation
Excellent solution for homes without ductwork
Clean filters and regular servicing reduce allergens.
We ensure your AC system functions at peak performance.
We provide prompt air conditioning repair in Rochester, NH and surrounding towns, with many service calls handled the same or next business day when scheduling allows. If your system is not cooling or has completely failed, contact Marathon HVAC as soon as possible to schedule service.
Yes. We service and install central air conditioning systems, heat pump cooling systems, and ductless mini-split systems. We provide honest recommendations on whether repair or replacement makes the most sense based on system condition and cost.
Yes. Marathon HVAC installs and services single-zone and multi-zone ductless mini-split systems throughout Rochester and the Lakes Region. These systems are ideal for homes without ductwork, additions, and rooms that are difficult to cool.
Yes. Our AC maintenance services include seasonal inspections, coil cleaning, drain cleaning, electrical testing, and airflow verification to help prevent breakdowns and improve efficiency during peak summer months.
We provide air conditioning service in Rochester, Dover, Somersworth, Wakefield, Farmington, Alton, Meredith, Laconia, Conway, North Conway, Sanbornville, Moultonborough, and Wolfeboro, NH.
Typically, installations take 1 to 2 days, but more complex setups may require additional time.
