Serving Central & Southern Maine  ·  Licensed & Fully Insured info@knowlesmech.com (207) 445-4092

Our Services

One licensed team for heating, cooling, plumbing and commercial mechanical work — installed to code, serviced on schedule and priced in writing before the truck arrives.

High-efficiency furnace and tankless water heater installed in a Maine basement

Heating Systems

When the forecast turns, your heating system has one job. We install, service and repair oil, propane, natural gas and electric heating — plus cold-climate heat pumps — and size every system against the actual load of your building rather than a rule of thumb.

  • Furnace installation, replacement and repair
  • Boiler service and hydronic system work
  • Heat pump installation and refrigerant service
  • Combustion testing, venting and code compliance
Oil Propane Natural gas Heat pumps Boilers
Technician servicing a commercial rooftop air conditioning unit

Cooling & Air Conditioning

Maine summers are shorter, but they are not milder on equipment. We install and maintain central air, ductless mini-splits and commercial cooling systems — and we repair the ones installed by someone else, with honest guidance on repair-versus-replace.

  • Central air conditioning installation and repair
  • Ductless mini-split systems for rooms without ductwork
  • Rooftop units and commercial cooling service
  • Seasonal tune-ups and refrigerant leak detection
Central AC Mini-splits Rooftop units Dehumidification
Plumber installing a tankless water heater with copper piping

Plumbing

From a dripping fixture to a full repipe, our plumbers work clean and test everything before they leave. We handle water heaters, fixture replacement, leak detection and the piping that feeds your mechanical room.

  • Water heater repair, replacement and tankless installs
  • Leak detection and emergency water damage response
  • Fixture installation for kitchens and bathrooms
  • Repiping, valve replacement and freeze protection
Water heaters Leak detection Fixtures Repiping
Commercial boiler room with insulated piping, pumps and pressure gauges

Commercial Mechanical

Offices, retail, schools, municipal buildings and new construction. We coordinate mechanical scope from design through commissioning, work alongside your general contractor, and stay reachable when a building is occupied and something fails at 2 a.m.

  • Design-build mechanical packages and plan-and-spec work
  • Commercial boilers, rooftop units and hydronic systems
  • Ventilation, exhaust and make-up air
  • Service agreements with documented maintenance history
Design-build Boilers New construction Service agreements
Commercial rooftop solar array on a flat industrial roof in Maine

Solar Contracting

Solar work is mechanical work — racking, penetrations, roof integrity and electrical coordination. Because we already install and service the heating and cooling equipment underneath, we can integrate a solar array with your building's systems instead of treating it as a bolt-on.

  • Commercial rooftop arrays and ballasted racking
  • Ground-mount systems and structural coordination
  • Battery storage and equipment integration
  • Permitting support and incentive documentation
Rooftop arrays Ground-mount Battery storage Commercial
Knowles Mechanical service technicians in front of a service van

Maintenance & 24/7 Emergency Service

Most emergency calls start as a maintenance item that went unnoticed. Our agreements cover seasonal tune-ups, filter and belt replacement, combustion and refrigerant checks — and move you to the front of the line when something does go down.

  • Annual heating and cooling tune-ups
  • Priority scheduling for agreement customers
  • Documented inspection reports and equipment history
  • 24-hour emergency dispatch, including weekends and holidays
Tune-ups Priority service 24/7 emergency

ServiceAgreements

Keep equipment efficient, catch small failures early and know exactly who to call when the heat stops.

Residential

Home Comfort Plan

$18/ month

  • Annual heating system tune-up
  • Annual cooling system check
  • Priority scheduling all year
  • 10% discount on repair parts
Enroll my home

On demand

Emergency Service

24/7dispatch

  • On-call technician nights and weekends
  • Holiday coverage for heating failures
  • Written estimate before repair work
  • No membership required
Call (207) 445-4092

Not sure what your system needs?

Describe the symptoms and we'll tell you what we would check first — and what it typically costs. Free written estimates on replacements and installations, and honest advice when a repair is still the right call.