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A one-zone ductless mini split runs $7,000 to $10,000 installed in Fairfax, often for a sunroom, an addition or a finished basement the ducts never reached.
Price range
$7,000-$10,000
8yrs @ 7.99%
$99/mo
15yrs @ 9.99%
$75/mo
Monthly figures on the starting price, the whole price financed, on approved credit. The lender sets the final terms. How financing works
Get your price in writing
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One of our HVAC technicians with a new Trane outdoor unit he just installed.
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
Installed, from the price book our HVAC price estimator runs on. A zone is one room with its own indoor head, and you get the price in writing before you decide.
Ductless mini split, one zone, installed
$7,000 to $10,000
or $117/mo at 0% APR for 60 months
Ductless mini split, two zones, installed
$11,000 to $15,000
or $183/mo at 0% APR for 60 months
Ductless mini split, three zones, installed
$12,500 to $18,000
or $208/mo at 0% APR for 60 months
Ductless mini split, four zones, installed
$16,000 to $21,000
or $267/mo at 0% APR for 60 months
Ductless mini split, five zones, installed
$19,000 to $25,000
or $317/mo at 0% APR for 60 months
Ductless mini split, six zones, installed
$23,000 to $30,000
or $383/mo at 0% APR for 60 months
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
Where you land in a range is mostly the distance from the outdoor unit to the room, the kind of head and the room left in the electrical panel.
The second zone costs the most because it often needs a bigger outdoor unit. Our mini split cost guide explains.
What’s different in Fairfax
Plenty of 1960s houses in the City of Fairfax and Mantua have grown since they were built: a family room off the back, a sunroom, a finished basement, a garage turned into a bedroom. The ductwork rarely grew with them. Stretching a duct run out to the new room starves the rooms already on it, which is why a mini split, one head in that room on its own outdoor unit, is the usual fix.
Long Branch and Greenbriar are the same story on bigger lots, mostly single-family houses from around 1970, the kind of house where an addition out back is the room the system never reaches.
Fair Lakes is the opposite problem. About a third of its homes are townhouses, most from the late 1990s and 2000s, where the top floor runs warm all summer and the lowest level runs cool, all on one thermostat. A head in the top-floor bedroom gives that floor its own setting without touching the system that runs the rest.
Inside the City of Fairfax the permit comes from the City’s own office. Everywhere else on a Fairfax address, it’s Fairfax County, and the rules for the county side are below.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and the room a ductless head usually ends up in.
| Place | Median home built | Most homes are | Heated with | Where ductless usually fits |
|---|---|---|---|---|
| Fair Oaks | 1995 | condo and apartment buildings, about 5 in 10 | gas, about 6 in 10 | Condo buildings: an outdoor unit needs the association’s yes. |
| City of Fairfax | 1966 | single-family houses, about 5 in 10 | gas, about 7 in 10 | Additions, sunrooms and upstairs rooms the old ducts barely reach. |
| Fairfax Station | 1982 | single-family houses, about 9 in 10 | gas, about 5 in 10 | 1980s and 90s houses: the bonus room, the sunroom, the far bedroom. |
| Kings Park West | 1976 | single-family houses, about 7 in 10 | gas, about 5 in 10 | Additions, sunrooms and upstairs rooms the old ducts barely reach. |
| Merrifield | 1990 | condo and apartment buildings, about 6 in 10 | gas, about 6 in 10 | Condo buildings: an outdoor unit needs the association’s yes. |
| Fair Lakes | 1998 | townhouses, about 3 in 10 | gas, about 7 in 10 | 1980s and 90s houses: the bonus room, the sunroom, the far bedroom. |
| Long Branch | 1968 | single-family houses, about 9 in 10 | gas, about 7 in 10 | Additions, sunrooms and upstairs rooms the old ducts barely reach. |
| Mantua | 1968 | single-family houses, about 7 in 10 | gas, about 7 in 10 | Additions, sunrooms and upstairs rooms the old ducts barely reach. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Most of the Fairfax Station Census place, in the table, has Fairfax mail, so it counts here.
When it’s the right call
Glass on three sides gains heat faster than any duct can carry it out, and the room was probably never on the duct plan to begin with. A head sized for the glass, not just the floor area, is what makes it a room again.
Plenty of older houses got central air added years after they were built, and the rooms at the end of the duct run are the ones that stay warm.
The bonus room, the sunroom, the bedroom over the garage. We check for a closed damper or a crushed duct first; sometimes that’s all it is.
Paperwork, locally
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
Questions worth asking anybody who quotes you, us included.
A home office that runs all day, a guest room used twice a year and a sunroom full of glass need different sizes. Ask the installer to size the head for the room’s windows, exposure and use, not only its square footage.
If the room’s trouble is a closed damper or a crushed duct, a mini split is an expensive fix for a cheap problem. Ask what they checked first.
Ask whether it covers the line set run, the new circuit and putting the walls back, or only the equipment.
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.
I would gladly recommend them to anyone in the greater Fairfax/Alexandria area without reservation.
Swiftpro came out the same day I called when my AC was out and had it fixed in less than an hour after arriving.
He was very professional and had a great grasp of a mini-split system, the product you use and installation options in my particular space. He must be a very valued resource for your company.
The system we put in first
Built to take a beating. Put in by our crew.
Heat lamps, snow and rain on one outdoor unit: that’s Trane’s own film. We’re a Trane Comfort Specialist, on Trane’s own dealer locator, and when you pick a Trane, our crew puts it in.
Films: Trane’s own.
Questions
On the county side, yes: Fairfax County treats heating and cooling equipment as mechanical permit work, and a system on the newer A2L refrigerants needs a refrigeration certification with the permit. Inside the City of Fairfax, the City’s own permit office handles it.
Yes. A multi-zone outdoor unit runs two or more heads, and two zones run $11,000 to $15,000 installed. If a second room might come later, price it now: a single-zone outdoor unit can’t take a second head.
Installed, one zone is $7,000 to $10,000, two zones $11,000 to $15,000 and three zones $12,500 to $18,000, up to $23,000 to $30,000 for six. The HVAC price estimator gives your number.
Both. A ductless system is a heat pump, and cold-climate models keep heating well below freezing, which covers a Northern Virginia winter.
Ready when you are
Call, or send the form at the top. You get the installed price in writing before anything goes on the wall.
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 Fairfax 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.