Air Conditioning & Heating Services in Fairfax, VA
We provide reliable heating and cooling services in Fairfax, VA. HVAC Unlimited keeps your home comfortable year-round with prompt expert AC repairs, replacements, and maintenance. Call today.
SCHEDULE YOUR SERVICE
Secure an appointment in just a few steps.
The Locally Trusted AC & Heating Specialist
Looking for trusted HVAC service in Fairfax, VA? HVAC & Plumbing Unlimited is the local team homeowners count on for reliable AC repairs, heating system replacements, and seasonal tune-ups. From older brick homes near Old Town Fairfax to newer townhouses off Route 123 and family homes around Fair Oaks, our technicians know the unique comfort challenges of Northern Virginia living—humid summers, cold snaps, and everything in between. With upfront pricing, 24/7 emergency support, and decades of local know-how, we make sure your home stays comfortable all year long.
Need help now? Reach us online or call us at (703) 455-6000.
Heating & Air Conditioning Services We Provide in Fairfax, Virginia
Heating
- Furnace Repair
- Furnace Installation & Replacement
- Furnace Maintenance & Tune-Ups
- Boiler Repair
- Boiler Installation
- Boiler Maintenance
- Heat Pump Repair
- Heat Pump Installation
- Heat Pump Maintenance
- Hybrid & Dual-Fuel Systems
Cooling
- AC Repair
- AC Installation & Replacement
- AC Maintenance & Tune-Ups
- Ductless Mini-Split Repair
- Ductless Mini-Split Installation
- Ductless Mini-Split Maintenance
Indoor Air Quality
- Air Purification Systems
- Humidifiers & Dehumidifiers
- UV Air Scrubbers
- Duct Cleaning
- Dryer Vent Cleaning
- Duct Repair & Sealing
Others
- Airflow Balancing
- Zoning Systems
- Thermostat Installation
- 24/7 Emergency HVAC Service
- Annual Maintenance Plans
- Commercial HVAC Services
The Locally Trusted Furnace Maintenance Experts by Fairfax, VA Neighborhoods
Fairfax homeowners don’t just need heating and cooling that works—they need a service team that shows up on time, treats their home with respect, and delivers solutions built for Northern Virginia’s unique climate. That’s why families across the area continue to trust HVAC & Plumbing Unlimited.
What sets us apart:
✔ Local expertise: We understand Fairfax homes—whether it’s a brick colonial with aging ductwork or a newer townhouse with hot upstairs bedrooms.
✔ Skilled technicians: Our team undergoes ongoing training to stay ahead of new technology, from high-efficiency heat pumps to ductless mini-splits.
✔ Honest service: Upfront pricing, clear communication, and recommendations based on your needs—not sales quotas.
✔ Safe and reliable work: Every installation and repair is completed to code and tested for long-term performance.
✔ Customer-first approach: From 24/7 emergency coverage for Comfort Club members to routine maintenance, we’re here whenever you need us.
For decades, our focus has been simple: combine technical excellence with personal care. That commitment to quality, honesty, and reliability is why Fairfax families continue to count on us season after season.
AC unit causing you problems? Call us at (703) 455-6000!
Fairfax Air Conditioning Services
As Fairfax locals, we understand the unique climate and the common HVAC issues Fairfax homeowners face. Our extensive experience ensures we deliver top-notch service, whether you need a quick repair or a complete system overhaul.
Air Conditioning Repair
When your AC system acts up, you need quick and efficient solutions. Our elite expertise and problem-solving mindset ensure we address any issue, from refrigerant leaks to compressor failures, with precision. Our NATE-certified technicians are rigorously trained to handle all brands and models, guaranteeing reliable repairs every time. Common problems include:
- Clogged or dirty filters reducing airflow and efficiency.
- Refrigerant leaks causing insufficient cooling.
- Faulty thermostats leading to inconsistent temperatures.
Regularly replacing AC filters every 1-3 months is crucial for optimal performance and air quality in Fairfax’s varying climate.
Air Conditioning Maintenance
Preventative maintenance is key to avoiding unexpected breakdowns and extending your AC system’s life. Schedule maintenance before the humid Fairfax summer season to ensure your system is ready for peak usage. Our comprehensive maintenance services include:
- Detailed inspections to identify potential issues early.
- Cleaning coils and other components to improve efficiency.
- Checking and tightening electrical connections.
- Regular tune-ups to ensure optimal performance.
Apart from providing top-notch services, our technicians take the time to educate homeowners with valuable maintenance tips, empowering them with knowledge about their systems. This customer-centric approach not only fosters loyalty but also ensures that your AC system operates smoothly and efficiently.
AC Replacement & Installation
When it’s time for a new system, trust our team to guide you through the process. We provide professional installation services, ensuring your new AC operates at peak efficiency. Key steps include:
- Assessing your home’s cooling needs.
- Recommending high-efficiency units that save on energy bills.
- Ensuring proper installation to maximize system lifespan.
Upgrading to a high-efficiency model can reduce your carbon footprint, a priority for many Fairfax homeowners.
24 Hour Emergency Heating & AC Repair in Fairfax, VA
Emergency Services for Contract Customers
You need immediate repairs from an HVAC company that won’t overcharge or under-service. We understand the urgency and guarantee fair treatment for all emergency HVAC repairs in Fairfax.
While we serve all customers until 10 PM, overnight emergency service (after 10 PM) is reserved for contract customers.
HVAC emergencies often strike at the worst times. At HVAC & Plumbing Unlimited, we’re prepared to handle heating and air conditioning emergencies in Fairfax, VA year-round. Our 24-hour service ensures prompt and professional repairs, regardless of the issue’s size.
See our financing and coupons!
Our experienced staff treats your emergency like our own, providing swift solutions to restore your comfort. Whether it’s a complete system failure or a minor issue, we’re equipped to manage all heating and AC emergency repairs with the same level of dedication and expertise.
Ductless Air Conditioning Services in Fairfax, VA
Ductless Installation
Ductless mini-splits are ideal for older Fairfax homes, additions, or spaces that never stay comfortable. Our team evaluates your layout, recommends the right equipment, and installs the system with minimal disruption. The result is quiet, efficient, zoned cooling that fits your home without the need for major renovations.
Ductless Repair
If your ductless system stops performing, we can help. From refrigerant leaks and frozen coils to fan issues or clogged filters, our technicians service all makes and models. Most problems can be repaired in a single visit thanks to our fully stocked service vehicles.
Ductless Replacement
When repair costs start to add up or your unit has reached the end of its life, a replacement is often the smarter choice. We install high-efficiency systems that improve comfort, lower your energy bills, and handle Fairfax’s humid summers with ease.
Heat Pump Repair and Replacement
Heat Pump Installation
Heat pumps provide both heating and cooling, making them one of the most versatile systems for Northern Virginia’s climate. Our technicians size and install units for maximum efficiency, ensuring your home stays comfortable year-round without wasting energy. Variable-speed and inverter-driven models offer even greater control and energy savings.
- Manual J sizing for accuracy
- Options for ducted or ductless configurations
- High-efficiency models available for rebate eligibility
Heat Pump Repair
When your heat pump struggles, you need a team that responds quickly and knows what to look for. Fairfax homeowners often deal with frozen coils in winter, refrigerant issues, or thermostat miscommunication that leaves rooms unevenly heated or cooled. We stock common parts on our trucks so most repairs can be handled same-day.
Common issues we fix:
- Frozen or iced-over coils
- Low refrigerant or leaks
- Faulty reversing valves
- Thermostat problems
Heat Pump Replacement
Older heat pumps lose efficiency and can drive up utility bills. If your system is 10+ years old, frequently breaking down, or no longer keeping up with demand, it may be time to upgrade. We’ll help you select a modern, efficient unit that balances performance with cost—and even recommend dual-fuel systems that combine a heat pump with a gas furnace for maximum reliability in Fairfax’s variable climate.
Fairfax Heating, Boiler, and Furnace Repair & Installation Services
Installation & Replacement
We install and service a wide range of heating systems, including gas and electric furnaces, boilers, and ductless heating units. Whether you’re replacing an aging furnace, upgrading to a high-efficiency boiler, or adding ductless heating to a room that never stays warm, our team ensures the job is done right. We start with a full evaluation of your home’s size, insulation, and layout, then recommend properly sized equipment for safe, efficient performance.
- Gas & electric furnaces
- Boilers (steam and hot water)
- Ductless heating systems
Repairs & Emergency Service
When your heat cuts out, you need a fast, accurate fix. Our Fairfax technicians handle everything from furnaces with ignition failures and blower motor problems to boilers with leaks, low pressure, or faulty pumps. We service all makes and models and stock common parts to complete most repairs on the first visit.
Common repairs include:
- Furnace heat exchangers, burners, and ignitions
- Boiler leaks, circulator pump failures, and valve issues
- Noisy systems, uneven heating, or thermostat malfunctions
Maintenance & Inspections
Routine service helps your heating system last longer and run more efficiently. Our seasonal tune-ups check all critical components, clean and test your equipment, and identify small issues before they become big problems.
- Thermostat calibration and safety control testing
- Burner and heat exchanger cleaning & inspection
- Boiler water level and pressure checks
Call (703) 455-6000 for prompt service on any AC or heating system.
Proudly Serving Fairfax, VA
Fairfax is known for its small-town character surrounded by the bustle of Northern Virginia, with historic homes, brick colonials, townhouses, and newer planned communities all side by side. Each of these property types comes with its own comfort challenges—older homes may lack modern ductwork, while newer builds often struggle with hot upper levels or high utility bills. Our team understands these differences and knows how to match the right HVAC and plumbing solutions to each.
The local climate adds another layer of complexity. Summers are long, hot, and humid, which means air conditioners and heat pumps need to be sized and installed to handle heavy moisture loads. Winters bring cold snaps that can stress aging furnaces, boilers, and plumbing systems. Add in the tree cover and shaded lots common around Fairfax, and you’ll often see humidity lingering even when the temperature isn’t extreme.
That’s why homeowners here need more than just equipment—they need systems designed for Fairfax living. At HVAC & Plumbing Unlimited, we’ve spent years servicing homes throughout the area, from AC installations in older neighborhoods to emergency plumbing repairs during freezing weather. Whatever the season, our goal is to keep Fairfax families safe, comfortable, and confident in their home systems.
Local Reviews for Fairfax
Hector – Fairfax, VA
Robert Campbell, from HVAC unlimited, has been servicing my house hvac systems and our family systems for many years. Robert’s hvac services are always very professional and thorough. When any repairs are needed, we feel comfortable about his honest suggestions and prices. We have recommended HVAC UNLIMITED to our family and friends and Robert Campbell is an asset to his company!
Erik – Fairfax, VA
Jermaine was super knowledgeable of my building and was able to identify and repair the problem with my air conditioner in a very quick timeframe!
T – Fairfax, VA
Great job!
LISA – Fairfax, VA
Love that Jermaine is back with HVAC Unlimited.
Laura – Fairfax, VA
Jeremy was completely thorough when servicing my unit that had stop heating. He explained every step and it’s cost as he went along. I have used several service companies and never been this pleased. I will definitely use HVAC for every call in the future!
Other Services in Fairfax, VA
24/7 EMERGENCY SERVICE
If you’re having a home emergency, you don’t want to wait a minute too long. That’s why our technicians and plumbers are available to solve problems 24 hours a day, and that includes weekends and holidays. After all, things always break at inconvenient times.
AIR CONDITIONING REPAIR
Northern Virginia summers are getting hotter, and if your air conditioner isn’t keeping up, we’re here to help! Learn more about our fast and reliable AC repair services to restore your home’s comfort and keep you cool all season long.
AC INSTALLATION
Need a new air conditioner? We’ll help you choose the right system for your home and install it with expert precision. From energy-efficient upgrades to full replacements, our Lorton-based team makes sure your new AC is built to last and ready to handle the summer heat.
Furnace Maintenance
Give your furnace the professional care it needs before winter hits in Fairfax, VA. Our certified technicians perform detailed tune-ups that prevent breakdowns, improve efficiency, and keep your home safely heated all season long.
FURNACE INSTALLATION
Upgrade your heating system with expert furnace installation from HVAC & Plumbing Unlimited. We install high-efficiency gas, electric, and oil furnaces tailored to your home’s needs—backed by certified technicians, trusted Carrier products, and a 100% satisfaction guarantee.
AFFORDABLE WELLS FARGO FINANCING
Money should never get in the way of your family’s safety and comfort. We’ve arranged special payment options through Wells Fargo Financing that let you start enjoying your new system or repairs right away and pay for it over several months.