Open 24/7 for emergencies
The diagnostic visit is $99, and a run capacitor replaced is $240 to $370 from our published price book.
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AC and heat pump repair in Oakton, 22124, from the condos near Route 123 to the big lots toward Vale Road, priced from the book before work starts.
5.0 stars across 1,132 reviews
One of our HVAC technicians beside an outdoor unit at a Northern Virginia home, the vans at the curb.
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceOften same-day, and we will tell you honestly when we can get there.
Our own HVAC installersA dedicated heating and cooling team, separate from our plumbers
Price in writing firstYou see every option priced before anything is ordered
What it costs
The same price book as our AC repair page. The diagnostic visit is $99, and the common parts ride on the truck, so most of these get fixed on the first visit.
Run capacitor replaced
$240 to $370
Contactor replaced
$290 to $425
Condensate drain cleared
$175 to $420
Refrigerant topped up
$190 to $740
Blower wheel pulled and cleaned
$300 to $440
Refrigerant leak found and repaired
$1,850 to $2,700
or $31/mo at 0% APR for 60 months
Repair diagnostic visit
$99
Monthly figures: 60mo @ 0% APR on each starting price, the whole price financed, on approved credit. Longer plans lower the payment and cost more in total. The lender sets the final terms. How financing works
Often same-day, and we will tell you honestly when we can get there.
With Comfort+ membership, $20 a month or $199 a year, the diagnostic visit is included, any service is 15% off, and the cooling and heating maintenance visits are part of the membership.
What’s different in Oakton
Oakton splits close to even between gas heat and electric heat. About half of its owner homes heat with gas, which means an air conditioner outside paired with a furnace inside. About four in ten heat with electricity, and that usually means a heat pump: one outdoor unit doing the cooling all summer and the heating all winter. Inside the Town of Vienna next door, eight in ten heat with gas, so an Oakton cooling call is far more likely to land on a heat pump.
The kind of house mostly decides which one you have. About four in ten Oakton homes are townhouses or units in condo and small apartment buildings. In the condo and apartment buildings north of I-66 off Chain Bridge Road, the cooling tends to be a compact split or a fan coil tucked in a closet, and the condenser may sit on a roof or a pad the association controls. In the townhouse clusters off Jermantown Road and Miller Road, like Oak Marr Courts and Oakborough Square, a condenser usually sits in a row with the neighbors’, so a replacement goes back on the same pad unless the HOA approves a move.
North of Jermantown Road the lots run past an acre, and a big house often carries two systems, one for each floor. If one floor is cooling and the other isn’t, compare the two outdoor units before you call: a still fan on one tells us where to start.
A repair needs no permit. Replacing a system does, and in Oakton that’s Fairfax County every time, since there’s no town government in between; the county also wants an A2L certification with any new unit on the newer refrigerants. If your system went in before 2010 it most likely runs R-22, which is no longer produced, so a leak repair at $1,850 to $2,700 deserves a replacement price beside it.
Neighborhood by neighborhood
Census figures for each place, and what that usually means for the air conditioning. Median year built and heat count owner-occupied homes only.
| Place | Median home built | Most homes are | Heated with | What the cooling usually is |
|---|---|---|---|---|
| Oakton | 1981 | single-family houses, about 4 in 10 | gas, about 6 in 10 | 1980s and 90s houses, most on their second or third system. |
| Difficult Run | 1982 | single-family houses, nearly all | gas, about 6 in 10 | 1980s and 90s houses, most on their second or third system. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 22124 as a whole: every Oakton address. The Oakton Census place in the table also takes in streets with Vienna and Fairfax mail.
What you’d notice
In a two-system Oakton house, the unit serving the basement or the guest rooms can quit and nobody notices for days. Before you call, stand by each outdoor unit while the thermostats call for cooling; the one that’s silent, or humming with its fan still, is the one we need.
Ice on the outdoor lines in July means low refrigerant or starved airflow. Shut it off to thaw and call; running it iced can take out the compressor.
Usually the outdoor unit has stopped running. A hum with no fan turning is almost always the run capacitor; silence while the thermostat calls is usually the contactor.
Choosing who fixes it
Questions worth asking anybody who comes out, us included.
In Oakton you’re nearly as likely to own one as the other. A heat pump has a reversing valve and defrost controls a plain AC doesn’t, and a tech who mostly sees furnace and AC setups can miss them. Tell whoever you call which one you have.
A company that prints what a capacitor or a contactor costs has already told you the number. One that won’t say until the tech is in your driveway hasn’t.
A healthy system drops the air somewhere around 16 to 22 degrees across the indoor coil. Low refrigerant means a leak, and topping it up every summer is the expensive way to find that out.
Some repairs aren’t worth doing on a 20-year-old system. The good answer shows you the repair price and the replacement price side by side and lets you pick.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
Excellent price and service. Had our AC/heating system replaced. Gave us a great price and top quality install. Can’t say enough good things about them.
Where we work
Next door to Oakton: Fairfax, Vienna, Reston, Dunn Loring and Herndon.
Questions
Yes, the parts that belong to you. In many condo buildings the unit inside your home is the owner’s, while the roof, the risers and any refrigerant lines through common walls are the association’s. Check your documents, and tell us where your condenser sits when you book.
Yes, from Fairfax County: replacing a heating or cooling system is mechanical permit work, and units on the newer A2L refrigerants need the county’s A2L certification with it. A repair, like a run capacitor at $240 to $370, needs no permit at all.
The diagnostic visit is $99. The common repairs: a run capacitor $240 to $370, a contactor $290 to $425, a condensate drain cleared $175 to $420, refrigerant topped up $190 to $740. A refrigerant leak repair runs $1,850 to $2,700.
Fix the cheap parts on almost anything. Think twice about a big repair on a system over 15 years old, and about any leak on an R-22 system. The HVAC estimator prices a new system in about a minute, so you can put the two numbers side by side.
Ready when you are
Call, or send the form at the top. The tech prices the repair from the book before starting, and if it’s the end of the road you’ll hear that first.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Oakton and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
From SwiftPro Heating, Cooling & Plumbing in Chantilly. Housing figures are the Census Bureau’s American Community Survey, 2020 to 2024, for each place named; permit, water and sewer facts link to each office’s own page and were checked in September and October 2026.