Furnace, Boiler & AC Repair and Mini Split Installation in Dartmouth, MA
Armus Mechanical is based in Lakeville and serves all of Dartmouth. We repair and replace central AC, boilers, furnaces, heat pumps and mini splits in Dartmouth homes, and we service commercial AC and refrigeration for Dartmouth businesses. Call 508-521-9477; the phone is answered 24/7.
- Same-day repair
- Free estimates on new systems
- Financing through Wisetack
- Warranty on our labor
Hi! What's going on at your Dartmouth home today?
At a glance
- Service area
- All of Dartmouth, MA, from South Dartmouth and Padanaram to North Dartmouth
- Based in
- Lakeville, MA. We come to your home or business.
- Phone
- 508-521-9477, answered 24/7
- Specialties
- Central AC, whole-system replacements, boilers and oil tanks, mini splits, commercial AC and refrigeration
- Pricing
- Paid diagnostic on repairs; free written estimate on replacements
Based in Lakeville, we cover all of Dartmouth. The phone is answered 24/7: 508-521-9477.
What do you need today?
RepairDartmouth repairs range from central AC and commercial refrigeration to heat pumps and mini splits, and each one starts with a paid diagnostic visit.HVAC repair →
MaintenanceWe service a property with two heating and cooling systems in one visit, as we did in June 2026.Maintenance plans →
ReplacementEvery replacement starts with a free written estimate; Dartmouth jobs have ranged from boiler-room upgrades to whole-system swaps.New system quote →
EmergencyCall 508-521-9477 if the AC quits or the boiler will not fire. The phone is answered 24/7.Emergency heating & AC · 508-521-9477 →Recent work in Dartmouth
Between April 2025 and October 2026 we completed 27 jobs in Dartmouth.
- May 2026, Oil tank. Removed an oil tank.
- May 2026, Commercial AC. Did leak detection and dye injection, then recharged the refrigerant.
- February 2026, Fujitsu mini split. Replaced a control board.
- December 2025, Boiler room. Added a relay to the power venter and a pressure switch, and installed a hard-wired smoke and carbon monoxide detector.
- July 2025, First-floor heating and cooling system. Removed the old first-floor system and installed its replacement.
- June 2025, Whole-house heating and cooling. Did a full heating and cooling upgrade with airflow work in the basement.
Updated October 2026
Heating & Cooling Services in Dartmouth
In Dartmouth we repair and replace central AC, boilers, furnaces, heat pumps and mini splits, remove oil tanks, and service commercial AC.
Central AC repair
In 2026 our visits included condensate drain clearing with a filter change in August, a diagnostic and cleaning in September, and a maintenance visit on a property with two heating and cooling systems in June. A central AC repair starts with a paid diagnostic visit.
HVAC replacement
Two of our Dartmouth jobs were whole-system replacements: a first-floor system in July 2025 and a full upgrade with basement airflow work in June 2025. Each began with a free written estimate.
Boiler repair and replacement
Boiler work in Dartmouth can be small and safety-related, such as the venter relay, pressure switch and detector we added in December 2025. Boiler replacements start with a free written estimate.
Oil tank removal
We removed an oil tank in Dartmouth in May 2026. Homes that are leaving oil can pair that with an oil-to-gas conversion where a gas main runs, or with a heat pump.
Mini split and heat pump repair
In February 2026 we replaced a control board on a Fujitsu mini split in Dartmouth. A repair starts with a paid diagnostic visit.
Commercial HVAC
In May 2026 we found a leak on a commercial AC unit with dye injection and recharged it. The commercial HVAC page covers rooftop units, boilers and VRF systems.
Heat pump installation in Dartmouth
We assess the rooms, calculate heating and cooling loads, check electrical capacity, and plan indoor-unit placement and line-set routes. We install Fujitsu and Mitsubishi systems and explain the proposed layout during your estimate.
See heat pump installation for how an installation goes and what to have ready. A nearby example: in September 2026 we installed a heat pump system in Acushnet.
Dartmouth Neighborhoods We Serve
We serve all of Dartmouth, including these areas:
- South Dartmouth and Padanaram
- North Dartmouth and the UMass Dartmouth area
- Smith Mills
- Hixville
- Russells Mills, Bliss Corner, Salters Point and Nonquitt
Nearby towns we also serve: New Bedford, Westport, Fairhaven, Acushnet, and Fall River.
New BedfordFall RiverDartmouthFairhavenAcushnetWestportSomersetSwanseaMattapoisettRochesterFreetownWarehamRehobothMiddleboroughTauntonRaynhamBerkleyNortonBridgewaterWest BridgewaterEastonBrocktonMansfieldStoughtonRandolphPlymouthDuxburyMarshfieldScituateNorwellCohassetHinghamQuincySandwichFalmouthBarnstableHyannisYarmouthChathamOrleansWellfleetProvincetownEastern Rhode Island What are Dartmouth homes like for heating and cooling?
Dartmouth has two kinds of housing: older shoreline homes in South Dartmouth around Padanaram and Apponagansett Bay, and capes, ranches and colonials farther north near Route 6 and UMass Dartmouth. Outdoor equipment near the water sees salt air, so coils and cabinets need regular cleaning. Both oil and gas heat are common. Some properties run two separate heating and cooling systems, and we service both in one visit.
Which utility and rebate program applies in Dartmouth?
Dartmouth gets its electricity from Eversource, which also supplies gas along streets with a main. Eversource customers use Mass Save for heat pump rebates and the 0% HEAT Loan, which go to eligible households. Because terms change, we check the program with you before you commit.
Commercial refrigeration in Dartmouth
Dartmouth businesses call us for walk-in coolers and freezers, reach-ins, display cases and ice machines. See commercial refrigeration repair for the equipment we service and what to tell us when you call.
Family owned and operated out of Lakeville, licensed and insured in Massachusetts.
We fix, maintain and install heating, cooling and water-heating systems. We do not sell equipment on its own or repair household appliances.
Available for new systems through Wisetack via Housecall Pro, subject to credit approval. Estimates on new systems are free.
Seasonal plans keep your system running and catch small problems before the first freeze. Ask about yearly maintenance options.
Every repair and installation carries a warranty on our labor on top of the manufacturer's equipment warranty, written on your quote.
Mass Save Heat Pump Installer Network participating contractor.
Rebates and the 0% HEAT Loan available.
Dartmouth Furnace, Boiler & AC Questions, Answered
My AC is blowing warm air in Dartmouth. What should I check?
Check that the thermostat is set to cool, the filter is clean and the outdoor unit has power. A blocked condensate drain can shut a system down, and we cleared one with a filter change in August 2026. If it still blows warm, call 508-521-9477; repairs start with a paid diagnostic visit.
I have an old oil tank in Dartmouth. Can you remove it?
Yes. We removed an oil tank in Dartmouth in May 2026. See oil tank removal and oil tank replacement for the steps, and oil-to-gas conversion if you are leaving oil.
Do you service commercial AC and refrigeration in Dartmouth?
Yes. We found and repaired a leak on a commercial AC unit in May 2026, and we service walk-in coolers, reach-ins and ice machines. See commercial refrigeration repair.
Can a mini split heat my Dartmouth home in winter?
Yes, a cold-climate mini split sized to the rooms can heat through a New England winter. We also repair existing mini splits, including Fujitsu units. See mini split installation.
Is Mass Save available in Dartmouth?
Yes, if you are an Eversource customer, and Dartmouth is Eversource territory. Mass Save covers heat pump rebates and the 0% HEAT Loan, and we go over the current terms with you at the estimate because amounts change.
How does booking work for a Dartmouth visit?
Call 508-521-9477 at any hour, or send the form; we confirm your visit by text. The diagnostic visit that starts a repair is paid, and a replacement gets a free written estimate.
Brands we install in Dartmouth
- Lochinvar
- Triangle Tube
- Energy Kinetics
- Oxbox
- Aprilaire
Furnace, Boiler & AC Service in Dartmouth
Same-day repair. Call 508-521-9477, or tap Book ASAP and the office confirms your visit by text.