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A one-zone ductless mini split runs $7,000 to $10,000 installed off post at Fort Belvoir, often for a Cook Inlet room under the roof or a basement rec room.
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 Fort Belvoir
Thirty-one of Cook Inlet’s 108 townhouses are two and a half stories, by Fairfax County’s dwelling records, and all but one of those have dormers: a finished room tucked up under the roofline. It’s the last stop on the duct run and the first place the afternoon sun lands. The Weather Service logged a heat index of about 110 at Fort Belvoir on July 21, 2011, June 29, 2012 and August 13, 2016, and on days like that a dormer room on a builder system stays hot long after the rest of the house has cooled. One head up there gives it its own setting.
Below grade it runs the other way. The county records a finished rec room in 253 of Cook Inlet’s 256 basements, around 400 square feet at the median, and most of those basements are daylight basements with one wall partly above the yard. On the same thermostat as the bedrooms, a lower level like that usually runs cool in winter, and a head down there heats it on its own schedule.
Backlick Road in Accotink is older country. The county dates one house there to 1900 and six to 1925, and lists three Backlick Road houses with central heat but no central air. In a house that age, a mini split is the way to cool a few rooms without cutting new ductwork through old walls and ceilings: a small line set through an outside wall and a head high on the wall. Two rooms on one outdoor unit run $11,000 to $15,000 installed, three run $12,500 to $18,000.
Off post, Cook Inlet and Accotink are Fairfax County land, so a mini split goes through the county’s mechanical permit, with the county’s rules for the newer refrigerants below. On post it’s a different answer: The Villages at Belvoir owns those homes, and any change to their heating or cooling is the housing company’s call.
When it’s the right call
A room under the roof with dormers on a two and a half story townhouse gains heat through the roof all afternoon and sits at the far end of the ductwork. A head sized for that room, its windows and its roof, is what makes it livable in summer.
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.
An addition, a finished attic, a garage turned into a room. Stretching the ducts into it usually starves the rooms already on them.
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.
In a row of townhouses the outdoor unit can’t always sit near the head. Ask where the line set will run, how it’s covered on the outside wall, and whether your community has rules about what goes on a wall facing the street.
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.
We had a mini split ac/heat unit installed. They were here when they said they would be, were very professional, and did a very nice job.
Where we work
Next door to Fort Belvoir: Lorton, Springfield, Alexandria, Woodbridge and Fairfax Station.
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
Start with the room that’s wrong. If it’s only the dormer room, one zone at $7,000 to $10,000 does it. If the walkout rec room runs cold in winter too, one outdoor unit can run both heads, $11,000 to $15,000 installed, and that’s cheaper to do now than to add later.
Not through us. The homes on post are owned and kept up by The Villages at Belvoir, so a mini split or any other change to heating and cooling goes through The Villages. Put in a service request there.
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 Fort Belvoir 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.