Best HVAC Companies in Southern Maine
Aces Highlands of Portland is this publication's No. 1 for 2026. Fifteen other companies follow, described from pages they publish themselves.
The Aces Highlands crew with the company's service vans. Courtesy of Aces Highlands HVAC-Plumbing-Electrical LLC
Boston Business Watch names Aces Highlands HVAC-Plumbing-Electrical LLC the No. 1 heating and cooling company in southern Maine for 2026. The Portland firm works on heat pumps, boilers, furnaces, plumbing, and electrical service from one shop at 508 Riverside Street, Unit 1.
1. Aces Highlands, Portland
The company says its crews answer (207) 670-8616 at all hours, seven days a week, and that the work runs through 48 Maine towns from Portland to Augusta and York.
Heating and cooling on the company's site covers heat pumps, ductless mini-splits, boilers, radiant floor heat, and furnaces, including installation, repair, and maintenance. Plumbing on the same site covers leak repair, fixture installation, drain cleaning, and tank and tankless water heaters. Electrical work listed there runs from panel upgrades and rewiring to generators, outlets, lighting, and electric-vehicle chargers.
The company says it is a Mitsubishi Electric authorized installer and an Efficiency Maine registered residential vendor.
A photograph the company publishes shows two technicians in Aces Highlands shirts connecting a Mitsubishi Electric outdoor unit beside a house with gray siding. Another shows two GE outdoor units on stands in front of cedar shingles. A third shows an IBC boiler on a basement wall, with copper piping and a green expansion tank beside it.
The site lists four Maine credential numbers: master oil burner technician MS30020339, master plumber MS90020232, journeyman electrician MS60023157, and propane and natural gas technician PNT15077.
The company also describes an emergency line for a home with no heat, a burst pipe, or a lost circuit, and a lookup it calls Smart Insights, which it says lets a homeowner check a property before calling.
Seven people in Aces Highlands shirts stand between two white vans in the photograph at the top of this story. The van lettering reads HVAC, plumbing, and electrical. The shop address printed on the site is 508 Riverside Street, Unit 1, Portland, Maine 04102.
Dave's World, Scarborough
Dave's World lists seven Maine shops. The southern one is at 237 Gorham Road, Scarborough, Maine 04074, phone 207.289.1170, open Monday through Friday, 8 a.m. to 4 p.m. The same locations page lists shops in Augusta, Dover-Foxcroft, Edgecomb, Ellsworth, Presque Isle, and Windham, with the same weekday hours.
The homepage describes a home-services company working on heat pumps, generators, plumbing, drain cleaning, heat-pump service, and water heaters, and says it serves all of Maine from those seven locations. Its heat-pump page says the company has installed heat pumps in more than 14,000 homes and businesses in Maine, and that the office handles Efficiency Maine rebate paperwork. The about page says the company started in 2004 and, a few lines later, that it has been doing this work for more than 35 years. Both sentences are on that page.
Gelinas HVAC, Scarborough
Gelinas HVAC says it has served the Greater Portland area since 1994 and lists heating, cooling, electrical, and plumbing. The homepage phone is (207) 672-2801. The site says the company offers 24/7 emergency service. A careers page tells applicants they can stop by 224 Gorham Road in Scarborough, and a plumbing page says the company has operated from that address since 1994.
Service pages print Maine license numbers: oil license MS30023446 on the heating maintenance page, fuel license PNT17920 on the HVAC maintenance page, and electrical license MS60022397 on the ductless installation page. A Scarborough town page gives a different phone, 207-579-4802, and says William Gelinas and Brian McLellan founded the company and that Justin Zandan owns it now. The homepage contact form says marketing texts and calls may come from Heritage Home Service and its affiliates.
Pine State Services, Scarborough
Pine State Services lists 30 Center Street, Scarborough, Maine 04074, phone 207-489-2851, and says it is open 24 hours. The page says the company is part of Service Experts and that it handles HVAC, plumbing, and electrical work. An emergency-service page says Pine State has served Southern Maine homes since 1996 and that it repairs furnaces, boilers, heat pumps, and air conditioners. The site footer prints license numbers PNT5889, MS8235, and MS60022889. The town list on the main page includes Portland, Biddeford, Brunswick, Cape Elizabeth, Falmouth, Freeport, Kennebunk, Saco, and Scarborough.
AAA Energy Service, Scarborough
AAA Energy Service is a commercial mechanical contractor, not a house-call heating company. The about page says James J. Kelley founded Acme Engineering Co. in 1948, that his sons Peter and Tom Kelley started AAA Energy Service in 1983, and that David and Dan Kelley, the third generation, run it now. The company says it employs about 75 people and works in Maine, New Hampshire, Massachusetts, and Vermont. The southern Maine branch on that page is 4 Commercial Road, Scarborough, phone (207) 883-1473. Other branches listed there are in Pittsfield, Maine, and Auburn, New Hampshire.
The services page says the work covers commercial and industrial HVAC, refrigeration, plumbing and piping, electrical, and building automation, with technicians on call 24 hours a day.
Royal River Heat Pumps, Freeport
Royal River Heat Pumps lists 353 US Route 1, Freeport, Maine 04032, phone 207-400-4065. The homepage says the company installs Mitsubishi Electric heat pumps only, ducted and ductless, for homes in Freeport and the surrounding coast, and that it handles Efficiency Maine rebate paperwork. A ducted-heat-pump page says the service area runs from Kennebunkport to Boothbay Harbor, including Portland and Scarborough. A March 5, 2026 post says that since 2013 the company has installed thousands of heat pumps in that same stretch of coast. The careers page names Scott Libby as the owner.
Excel Mechanical and Construction, Brunswick
Excel Mechanical and Construction prints 26 Stanwood Street, Brunswick, Maine 04011, and says to call or text 207-391-7396. The homepage says the shop is open 24/7 and that the work is residential and commercial HVAC and plumbing, including heat pumps, boilers, air conditioning, ductless systems, geothermal, and oil-to-gas conversion. Towns named on that page are Brunswick, Yarmouth, Bowdoin, Woolwich, Phippsburgh (the site's spelling), Wiscasset, and Harpswell. The same page says the company is part of Efficiency Maine.
Fielding's Oil & Propane, Scarborough
Fielding's Oil & Propane is a fuel dealer that also installs and maintains heating equipment. The homepage says the company is locally owned, third-generation, and has served central Maine, southern Maine, and southeastern New Hampshire for more than 50 years. It lists a shop at 420 U.S. Route One, Scarborough, Maine 04074, a mailing address of P.O. Box 364, Scarborough, Maine 04070, and a main phone of 800-491-3194. The contact page gives the Scarborough and South Portland line as (207) 883-3194, with separate numbers for Portland and Falmouth, Biddeford and Saco, and York and Sanford. The homepage says 24-hour, seven-day emergency burner service is available in most regions. One page lists winter hours as 7:30 a.m. to 4:30 p.m. The contact page lists winter hours as 7:30 a.m. to 5 p.m. The FAQ says the company installs and maintains heating systems along with oil, kerosene, and propane delivery.
P. Gagnon & Son, South Berwick
P. Gagnon & Son says it has supplied heating oil and propane since 1904. The homepage lists 215 Main Street, South Berwick, Maine 03908, and phone 207-384-2213. The company says it delivers in York County and in Strafford and Rockingham counties in New Hampshire, and that its technicians have a combined 250 years of experience repairing, maintaining, and installing equipment. The about page, signed by president Mark Gagnon, says the company acquired Davis Oil in Eliot. Separate pages describe furnace and boiler sales, installation, and repair, including oil-fired and gas-fired equipment. This is a fuel and heating-equipment company. The site does not describe itself as a heat-pump shop.
ReVision Energy, South Portland
ReVision Energy lists its South Portland headquarters and showroom at 758 Westbrook Street, South Portland, Maine 04106, phone (207) 221-6342, open Monday through Friday, 9 a.m. to 5 p.m. The South Portland branch page says that office installs and services grid-tied solar arrays, heat-pump water heaters, air-source heat pumps, and electric-vehicle chargers through midcoast, southern, and western Maine. A service line on the same page is (207) 747-0076. Solar is the company's main business. Heat pumps are one of the services that branch says it installs.
Horizon Homes, Westbrook
Horizon Homes lists 865 Spring Street, Westbrook, Maine 04092, phone (207) 221-3221. The contact page says the company serves South Portland, Scarborough, Saco, Biddeford, Kennebunk, Westbrook, Gorham, Falmouth, Freeport, Yarmouth, Brunswick, and other Greater Portland towns. A South Portland article on the same site says the company has done this work since 2006. The work it describes is insulation, air sealing, and cold-climate heat-pump installation, often in that order. It is a home-performance contractor that installs heat pumps, not a full heating-and-cooling service shop.
Mechanical Services, Portland
Mechanical Services is a commercial heating, ventilation, air-conditioning, and refrigeration contractor. Its contact page lists a Portland office at 400 Presumpscot Street, Portland, Maine 04103, phone 207-774-1531, plus offices in Augusta, Hermon, Presque Isle, and Rockland. A careers page says building owners have used the company to maintain and repair heating, air conditioning, and ventilation systems since 1957. The expertise page says the work is commercial project and service work for businesses, schools, hospitals, and public agencies in Maine, New Hampshire, and Vermont. A refrigeration page says licensed technicians hold Maine oil, propane, and natural-gas licenses.
Southern Maine Heat Pumps, Gorham
Southern Maine Heat Pumps says it is a family-owned company based in Gorham and that the crew has more than 30 years of combined experience. The about page lists phone (207) 317-1077 and hours Monday through Saturday, 7 a.m. to 6 p.m. It says the company works on ductless mini-splits, multi-zone systems, heat-pump water heaters, and ERV air-exchange systems, and that it is an Efficiency Maine registered vendor and a certified installer for Mitsubishi, Daikin, and Samsung. Towns named on that page include Portland, Westbrook, South Portland, Cape Elizabeth, Scarborough, and Gorham. Southern Maine Heat Pumps is a client of Acadia Marketing, which publishes Boston Business Watch.
True North Home Comfort
True North Home Comfort says it does HVAC repair, furnace work, heat-pump installation, and plumbing for homeowners in York County and southern Cumberland County. The homepage phone is (207) 305-8939. The homepage says the company is open 24/7, including holidays, and that it is an Efficiency Maine registered vendor. Towns named on the page include Portland, South Portland, Scarborough, Biddeford, Saco, Kennebunk, Westbrook, Gorham, Windham, York, Kittery, Sanford, and Wells. The homepage does not print a street address for a shop.
Southern Maine Mechanical
Southern Maine Mechanical says it is an owner-operated HVAC contractor and lists phone (207) 560-7890. The homepage says office hours are Monday through Friday, 7 a.m. to 5 p.m., with a 24/7 emergency line, and that the work covers heat pumps, air conditioning, boilers, and furnaces, for homes and commercial buildings. Towns named on the page include Portland, Scarborough, Gorham, Westbrook, Falmouth, Freeport, Saco, Biddeford, and Brunswick. The homepage calls the company an Efficiency Maine qualified partner. It does not print a street address.
1Call Home Services, South Portland
1Call Home Services lists 918 Broadway, South Portland, Maine 04106, phone (207) 220-3232. The homepage says the company is locally owned and that HVAC is one trade among several, with roofing, electrical, plumbing, painting, paving, and other home work on the same menu. The HVAC page says the heating and cooling work includes heat pumps, mini-splits, furnaces, boilers, air conditioning, and duct cleaning, and names Portland, South Portland, Scarborough, Saco, Biddeford, and Westbrook. The homepage says the company has more than 20 years of experience in southern Maine homes.
Disclosure: Aces Highlands HVAC-Plumbing-Electrical LLC and Southern Maine Heat Pumps are clients of this publication's owner.
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