Full coverage · Greater Portland

One company for every season.

Install it, fix it, or keep it running — Cardinal handles all of it, with flat-rate pricing you see before we start. Here’s exactly what we do, and how.

Get a free estimate See rebates & financing
Heat pump installation Furnace & boiler service Central air conditioning Ductless mini-splits Indoor air quality Maintenance plans
Heat pump installation
Heat & cool in one

Heat pump installation

Cold-climate ductless and ducted heat pumps that actually perform at -10°F, sized right for your home so they heat hard in February and cool quietly in July. We help you claim every Efficiency Maine rebate and federal credit you qualify for.

  • Right-sized load calculation — no guessing, no short-cycling
  • Cold-climate units rated below -15°F
  • Efficiency Maine rebate & federal tax-credit paperwork handled
  • Clean install with warranty registration
MitsubishiFujitsuDaikinDuctedDuctlessMulti-zone
Furnace & boiler service
No-heat, handled

Furnace & boiler service

Oil, gas, and propane heating diagnosed and repaired fast, with the common parts already on the truck so most no-heat calls are fixed the same visit. When it’s time to replace, we quote a high-efficiency upgrade honestly.

  • 24/7 emergency no-heat response, November–April
  • Common parts stocked on every truck
  • Full safety & combustion check
  • Honest repair-vs-replace guidance
OilNatural gasPropaneBoilersForced-air furnaces
Central air conditioning
Quiet, even cooling

Central air conditioning

Quiet, efficient cooling sized to your home — not oversized to look impressive and then short-cycle all summer. We install, repair, and tune central AC so every room stays comfortable through a Maine heat wave.

  • Properly sized for even, whole-home cooling
  • New installs, repairs & refrigerant service
  • High-SEER systems that cut summer bills
  • Pairs cleanly with existing ductwork
Central ACHigh-SEERRepairsReplacements
Ductless mini-splits
Room-by-room comfort

Ductless mini-splits

Room-by-room comfort with no ductwork to tear into — perfect for additions, finished attics, and that one room that’s always too hot or too cold. Each zone gets its own thermostat, so you only condition the space you’re using.

  • No ducts to demo or retrofit
  • Independent zone control & thermostats
  • Ideal for additions, garages & bonus rooms
  • Whisper-quiet indoor head units
Single-zoneMulti-zoneAdditionsFinished atticsGarages
Indoor air quality
Breathe easier

Indoor air quality

Whole-home filtration, humidifiers, and HRV/ERV ventilation that clears out winter stuffiness and pollen without opening a window. We balance fresh air and humidity so a tight Maine home stays healthy, not stale.

  • Whole-home media & HEPA filtration
  • HRV / ERV fresh-air ventilation
  • Humidifiers & dehumidification
  • UV & air-purification add-ons
FiltrationHRV/ERVHumidifiersUV purificationAllergy relief
Maintenance plans
Stay ahead of it

Maintenance plans

Two tune-ups a year, priority scheduling, and discounted repairs — the cheapest way to keep a system out of the emergency-call line. Members get to the front of the queue when a heat wave or cold snap hits.

  • Two seasonal tune-ups per year
  • Priority booking ahead of non-members
  • Standing discount on any repair
  • Catches small failures before they strand you
Heating tune-upCooling tune-upPriority serviceRepair discounts

Not sure what you need?

Start with a free estimate.

Tell us what’s going on and a NATE-certified Cardinal tech will recommend the right system or repair — with a flat-rate price before any work begins.

Book my free estimate Call (207) 555-0192