Heating
Furnaces, heat pumps and boilers. Emergency repair when the house is cold, tune ups before it gets that far, and honest replacement quotes when a system is past saving.
Cool summers. Warm winters. Total comfort.
Comfort you stop thinking about.
Heating, cooling, water heater and electrical service for homes across Loudoun, Fairfax and Arlington County. Same technician on the job from diagnosis to cleanup.
13 years in the trade
24/7 emergency service
Free estimates on replacements
Straight pricing before work starts
What we work on
Repair, maintenance and replacement on the systems that keep a house livable. Tell us which one is giving you trouble and we will bring the right parts on the first visit.
Air conditioning
Central air, heat pumps and ductless mini splits. Refrigerant checks, condenser and coil cleaning, thermostat work, and full system replacement sized to the house rather than a rule of thumb.
Indoor air quality
Whole home filtration, humidifiers and dehumidifiers, UV treatment and duct sealing. Useful if anyone in the house has allergies or the upstairs never feels like the downstairs.
Water heaters
Tank and tankless repair, replacement and flushing. If you are running out of hot water halfway through a shower, that is usually a fixable problem.
Electrical
Panel upgrades, dedicated circuits for HVAC and appliances, outlets, lighting and diagnostics. Handy when a comfort problem turns out to be an electrical one.
Where we work
We serve homes throughout Loudoun, Fairfax and Arlington County, Virginia. If you are just outside these lines, call anyway and we will tell you straight whether we can get to you.
- Ashburn
- Sterling
- Leesburg
- Purcellville
- Middleburg
- Round Hill
- Herndon
- Reston
- Vienna
- Fairfax
- Chantilly
- Annandale
- McLean
- Centreville
- Great Falls
- Burke
- Arlington
- Clarendon
- Ballston
- Shirlington
Loudoun County
Fairfax County
Arlington County
What neighbors say
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First name L.Town, VA
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First name L.Town, VA
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First name L.Town, VA
Request service
Tell us what is going on and when you are home. Scheduled appointments run Monday to Friday, 9 AM to 5 PM, and we will confirm a window by phone, usually the same day.
- No charge to come out and quote a replacement.
- Repair pricing is confirmed with you before any work starts.
- No heat or no cooling right now? Call instead. Emergency service is available 24/7.
About KOA
Founded on a commitment to dependable service and honest craftsmanship, KOA Heating & Cooling was built to bring higher standards to local heating and air conditioning care. Our name and logo are inspired by the Koa tree, a symbol of strength, deep roots and resilience. Just as the Koa tree stands firm through changing seasons, we build long term relationships with our customers by providing comfort solutions engineered to last.
With 13 years of hands on experience troubleshooting, installing and maintaining residential and light commercial systems, our foundation is simple: do the job right the first time and treat every customer's home like our own.
When a KOA truck pulls up, you can expect punctual, professional service from a technician who respects your space and values your trust. We don't believe in high pressure sales pitches or vague answers. Instead, you get straightforward diagnostics, clear options, and clean, reliable workmanship from start to finish.
Your comfort, safety and peace of mind are backed by top tier industry qualifications:
- Virginia State Contractor License
- Virginia Master Tradesman License (HVAC)
- EPA Universal CFC Certification
- OSHA 30 Safety Certification