Same-Day AC Service Across Manassas, VA
Summers in Manassas, VA are unforgiving, and HVAC & Plumbing Unlimited is ready when your AC isn’t—same-day service, honest diagnostics, and the full range of air conditioning repairs, installs, and replacements.
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HVAC & Plumbing Unlimited is a family-owned company that has been serving Northern Virginia since 2006. Our technicians work Manassas neighborhoods every day — we know the homes here, we know the systems, and we treat every job with the care and respect your home deserves, from first call to final fix.
24/7 availability
Same-day service, including weekends and holidays
NATE certified, 12+ yrs exp.
Every technician is certified and brings over a decade of hands-on experience
Fully stocked trucks
Most repairs are completed on the spot — no waiting on parts or a second visit
We explain everything
We walk you through what’s wrong, what we’re doing, and how to keep it from happening again
Air conditioning services in Manassas, VA
From urgent repairs to planned replacements, we handle every aspect of your AC system.
AC repair
Manassas summers hit hard — and when humidity climbs above 70%, your system is working twice as hard to cool and dehumidify at the same time. That extra strain is often what pushes a compromised system over the edge. Whether it’s short cycling, uneven cooling, or a full breakdown, our technicians diagnose the actual cause and fix it on the same visit in most cases. We carry parts for all major brands so there’s no waiting on a second trip.
AC tune-up
A tune-up before peak season where temperatures regularly hit 90°F isn’t optional — it’s how you avoid a breakdown when you can least afford one. We inspect, clean, and test every key component, flag anything wearing down, and make sure your system is running as efficiently as possible going into the hottest months.
AC replacement
Virginia’s heat and humidity accelerates system wear — heat pumps in this climate typically last 12 to 15 years, and many older homes in areas like Old Town and Sudley are running systems well past that point. When repair no longer makes financial sense, we walk you through your options honestly, recommend a system sized correctly for your home, and handle the full replacement with the same certified technicians.
AC installation
A new system is only as good as the installation behind it. Improper sizing is one of the most common reasons systems struggle with humidity and fail to keep homes consistently comfortable — especially in older homes with layouts that weren’t designed around modern HVAC. We size every install to your specific home and make sure it’s set up correctly from day one.
Ready to get your AC back on track?
Call (571) 360-4520
Serving Manassas Neighborhoods
We work in Manassas homes every day across every part of the city.
Old Town / Historic Downtown — Older homes with aging systems and original ductwork. We know what to expect here.
Wellington & Wellington Ridge — One of Manassas’s largest communities. Mix of ages, mix of systems — we service them all.
Sudley & Sudley Manor — Established neighborhoods where many systems are approaching or past the 15-year mark.
Ashton Glen & Sumner Lake — Family neighborhoods where we handle everything from tune-ups to full replacements.
Westchester — Larger homes with more square footage. We make sure every system is sized and installed correctly.
Fernbrook — A growing neighborhood. Newer builds and older homes alike.
Thanks to the proximity of the Appalachian Mountains, Manassas is a bit cooler than other parts of the Washington, D.C. metro area. No matter what the weather brings, Manassas can count on dependable air conditioning repair and service from the professionals at HVAC & Plumbing Unlimited. With years of experience in the heating and air conditioning service business, these always-on-call technicians can handle complex installations, time-sensitive repairs and regular maintenance work. With a stunning selection of Carrier systems, HVAC & Plumbing Unlimited has Manassas’s HVAC needs under control.
Trusted in Manassas Since 2006
Nearly two decades in Northern Virginia means something. We’ve worked in homes across every Manassas neighborhood — seen every system, every setup, every quirk that comes with the housing stock here. Our technicians aren’t just passing through. This is where they work, and for a lot of them, where they live.
4.9 stars
Based on 874 reviews
12+ years
Average technician experience
Same day
Service in most cases
Our fleet of fully stocked trucks runs throughout Manassas every day. Most repairs are handled on the spot, on the same visit — no waiting on parts, no second trip scheduled for next week. We get there fast and we come prepared.
We’re family-owned, NATE-certified, and have been answering calls in this area since 2006. When you call, you’ll notice the difference.
Get your AC serviced today.
Call (571) 360-4520
Reviews from Manassas Homeowners
Betty — Manassas, VA
Mr. Garner was a wonderful representative for this company. He was not only on time, but called and was able to arrive a little early which worked perfectly for my schedule. Mr. Garner did a very thorough job and explained everything very patiently along with different options that his company could provide. There was absolutely no sales pressure, just information. I highly recommend this representative and company!
Paul — Manassas, VA
Professional and courteous. Patiently explained issue and showed me what the fix was. Definitely will use again.
John — Manassas, VA
Jeremy responded quicker than any other company that we called. He knew I had three little girls that were freezing and had my heat on and working the next day! I will call on him again and pass his info on.
Ken — Manassas, VA
Jeremy was prompt, professional and took his time to explain the entire system and subsequent checkup. He was right on time and identified a bad capacitor causing our system to work harder than it needed. As summer passes and winter approaches we are much more confident in our system! Glad he was available in Manassas!
Steve — Manassas, VA
I was very pleased with the service today. I live in a one level condo and had a small leak coming from above the hvac unit closet. Jeremy had to cut into the drywall and noticed the leak was coming from the unit above. He returned later in the day once access was obtained to upstairs unit and located the issue and fixed promptly. He was easy to talk to and explained everything with clarity. Highly recommend!
Dana — Manassas, VA
Jeremy was a very nice and knowledgeable guy. He explained everything so I could understand it, which was great. Highly recommend.
Bobby & Dana — Manassas, VA
We were able to get an appointment same day with Jeremy. He was very polite and easy to talk with. He checked our system thoroughly, gave recommendations on how to potentially solve the problem with and without having to spend money. He was very honest about how he could help with the situation. We didn’t feel like we just had “some guy” there to get as much money as he could out of us. It was nice to not feel pressured about making a decision on how to proceed. Thumbs up to Jeremy! Also the young lady that answered the phone to schedule our appointment was very nice and pleasant to talk to.
Theresa — Manassas, VA
I do appreciate an honest opinion, and I got one. So glad that I called this company. Thank you, Jeremy!
Daryush — Manassas, VA
Very honest repairman. Had a great disposition and although my old unit was a mess, I feel that I’m getting the best service and repairs possible!
Carla — Manassas, VA
He is friendly, efficient and honest. Great customer service and quality work.
United — Manassas, VA
Jermaine was very polite and professional.
John — Manassas, VA
Jeremy was very professional and helpful! Took the time to show me everything and explained what would be needed. He was very knowledgeable and honest! I trust HVAC Unlimited — most honest company!
Carla — Manassas, VA
Jeremy was friendly and informative and did his job well. Couldn’t have been better.
Paul — Manassas, VA
Excellent service. Answered my questions and made recommendations.
Rakesh Rao — Manassas, VA
Excellent service and great people. From reception to the onsite tech Jeremy, they were very professional and on time. No surprises and Jeremy is a great guy, honest and helpful. Signing up for a maintenance contract soon.
Raymond — Manassas, VA
Gets the problem diagnosed quickly and resolves it!
Steve — Manassas, VA
Jeremy was very thorough in fixing the issue. Quality of work is top notch.
Mark — Manassas, VA
The tech who came out and diagnosed the issue, and finally repaired it was extremely helpful and friendly. Great job! Highly recommended. Will use the company again for future needs.
Debra — Manassas, VA
We have used HVAC Unlimited for years now. By far this is the best company to deal with. Our service technician Ned is reliable, responsive and informative. We will continue to refer our neighbors, friends and family to them. They do not overcharge, they are fair and tell you exactly what the problems are and explain why something is broken.
Dr. Howard — Manassas, VA
Being a doctor and seeing patients as your employees were working, I was very happy with the way they presented themselves and did their work. I would recommend Shawn to my friends. If all your employees act and work like him your business is blessed.
Michelle — Manassas, VA
From the office staff answering the phone to the service tech, this company rocks! My furnace was acting up just before a snowstorm was set to hit my area and they had a tech out that same afternoon. The tech arrived earlier than scheduled and fixed the problem. I would recommend this company and will be using them in the future for all my heating and cooling needs.
Frequently Asked Questions About AC Services
How do I know if my AC needs repair or replacement?
If your system is under 10–12 years old and the repair cost is less than half the price of a new unit, repair usually makes sense. If it’s older, breaking down repeatedly, or struggling to keep up with summer heat, replacement is likely the better investment long-term.
How quickly can someone come out?
We offer same-day service for most AC repairs in Manassas. If you call in the morning, we can typically get a technician to you the same day.
What’s wrong if my AC is running but not cooling?
The most common causes are a clogged air filter, a refrigerant issue, a dirty condenser coil, or a problem with the compressor. Start by checking your filter — if that’s not it, it needs a technician.
Why is one room always warmer than the rest?
Usually a ductwork or airflow issue rather than the unit itself. It could be a blocked vent, duct leak, or a thermostat that isn’t reading the full house accurately.
How often should I have my AC serviced?
Once a year, ideally in spring before the cooling season starts. Regular maintenance catches small issues before they become expensive ones and keeps the system running efficiently through Manassas summers.
Why is my AC freezing up?
Most commonly a restricted airflow from a dirty filter or a refrigerant leak. Switch the thermostat to off, set the fan to on to thaw it, then replace the filter. If it freezes again, call — refrigerant issues need a technician.
What causes musty smells from my vents?
Usually mold or mildew in the drain pan, on the evaporator coil, or in the ductwork. High humidity makes this more common in Northern Virginia homes. It’s worth getting checked — it affects air quality, not just comfort.
Do you service all AC brands?
Yes — we work on all makes and models, including central air systems, heat pumps, and ductless mini-splits.
Will you tell me the price before starting work?
Always. You’ll know exactly what the repair costs before we touch anything — no surprises on the invoice.
Air Conditioning Services We Provide
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.
PREVENTIVE MAINTENANCE SERVICES
If you keep your home’s systems operating efficiently, they’re much less likely to break down. That’s how preventive maintenance saves you money. We’ll clean and check your equipment to make sure it’s performing at is best — or fix it if isn’t.
DUCTLESS MINI-SPLIT SYSTEMS
Looking for a practical and affordable way to add air conditioning to a new part of your home or improve the temperature in a room that just never gets comfortable? Ductless mini-split systems are powerful wall- or ceiling-mounted devices that heat and cool without expensive ductwork.
HEAT PUMP SERVICES
Stay comfortable year-round with expert heat pump services. We provide fast repairs, professional installations, and preventive maintenance tailored to Northern Virginia homes.
THERMOSTATS
Still using the same mechanical thermostat Grandpa had in his home? Today’s smart thermostats are designed with features that can make your home even more comfortable and reduce your energy bills. Many let you adjust the temperature wherever you are by using your phone.
CONVENIENT 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.