12 Heating and Cooling Companies Working in Southern Maine
The publication's 2026 pick is Portland's Aces Highlands, and the other firms are listed alphabetically with no rank.
By Kevin Duarte
· 2 min read
File photo: A historic building on Newbury Street. Photo: Beyond My Ken / CC BY-SA 4.0 via Wikimedia Commons
Boston Business Watch on Oct. 15 named 12 heating and cooling companies that say they work in southern Maine, and selected Aces Highlands HVAC-Plumbing-Electrical LLC as its choice for 2026.
Acadia Marketing publishes Boston Business Watch and also works with six of the companies named here: Aces Highlands, Coastal Maine HVAC, J&R Mechanical Systems, Knowles Mechanical, Southern Maine Heat Pumps and Win Mechanical. The other six are not clients. This is the publication's selection. It is not a reader vote. Each description comes from that company's website, read on Oct. 15, 2026.
The publication's selection
Aces Highlands HVAC-Plumbing-Electrical LLC, at 508 Riverside Street, Unit 1, in Portland, is the 2026 selection. The feature, with photographs from the company, is Aces Highlands Named Top Southern Maine HVAC Company for 2026.
The other companies, with no rank
Coastal Maine HVAC
Coastal Maine HVAC calls itself Coastal HVAC on its site. The company said it serves Greater Portland, listed 207-956-0393, and said emergency help is available at all hours.
Dave's World
Dave's World listed seven Maine shops, including one in Scarborough, and the phone number 800-432-8786. The site said the company works on heat pumps, plumbing and electrical jobs.
Excel Mechanical and Construction
Excel Mechanical and Construction said it is at 26 Stanwood Street in Brunswick and listed 207-391-7396. The site said the shop is open all hours, that the company is part of Efficiency Maine, and that the work includes heating, cooling and plumbing. Towns named on the homepage include Brunswick, Yarmouth, Woolwich, Bowdoin and Wiscasset.
Gelinas HVAC
Gelinas HVAC said it has worked in Greater Portland since 1994 and listed 207-672-2801. The site said the work covers heating, cooling, plumbing and electrical service, that emergency calls are taken at all hours, and that its pages are written for Scarborough.
J&R Mechanical Systems LLC
J&R Mechanical Systems said its crews cover Augusta, Brunswick and 18 nearby Maine towns, including towns in Cumberland County. The site listed 207-902-8899 for heating, cooling and plumbing.
Knowles Mechanical, Inc.
Knowles Mechanical said it serves central and southern Maine and listed 207-405-0612. The site said crews answer at all hours for heating, cooling, plumbing and commercial solar work.
Pine State Services
Pine State Services, a Service Experts shop, listed 30 Center Street in Scarborough and 207-489-2851. The page said the company has served southern Maine since 1996, that it is open 24 hours, and that the work covers heating, cooling, plumbing and electrical service.
Riser Heat Pumps
Riser Heat Pumps listed 207-517-0988 and said it installs heat pumps in southern and central Maine. The site said the equipment includes Samsung, Daikin, Fujitsu and Mitsubishi.
Royal River Heat Pumps
Royal River Heat Pumps listed 353 US Route 1 in Freeport and 207-400-4065. The site said the company installs only Mitsubishi Electric heat pumps, ducted and ductless, and that the work carries a 12-year parts warranty.
Southern Maine Heat Pumps
Southern Maine Heat Pumps said it is a family-owned shop in Gorham and listed 207-317-1077. The site said it is an Efficiency Maine registered vendor and that it installs Mitsubishi, Daikin and Samsung heat pumps.
Win Mechanical
Win Mechanical said its heating and cooling work is centered on Augusta, and its plumbing work on Brunswick and Cumberland County. The site listed 207-481-3675 and said the shop answers at all hours.
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