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A new furnace and air conditioner in Annandale run $8,898 to $23,000 installed, sized for the 1960s house as it stands today.
Price range
$8,898-$23,000
8yrs @ 7.99%
$126/mo
15yrs @ 9.99%
$96/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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5.0 stars across 1,132 reviews
One of our technicians with a new Trane outdoor unit he just installed beside a Northern Virginia house.
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
$8,898 to $23,000 installed for a furnace and air conditioner replaced together, 2 to 5 ton, from the same price book as our estimator. Where you land depends on the size of the house, the efficiency you pick, and what the ductwork and venting need.
Furnace and AC together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Furnace alone, keeping your AC
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
Heat pump system instead
$8,499 to $21,650
or $142/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
The HVAC replacement estimator gives your house its own number. Then we measure, and the price is in writing before anything is ordered.
Two years of labor come with every install. Monthly plans are on our financing page.
What’s different in Annandale
In the Annandale Census place half the owner homes were built in 1967 or earlier, and in Wakefield and Woodburn by 1968. Systems come and go every fifteen years or so, so a house that age has had several, while the sheet-metal trunk under the basement ceiling is usually the original. A new pair is only as good as the ducts it blows through, so we measure those first.
Replacing both at once is the moment to get the size right. Plenty of these houses have changed since the 1960s: a family room off the back, a lower level finished later, new windows. A system copied from the last label was sized for a different house. A room-by-room load calculation sizes the new pair for the one you live in now, and on a split-level, the dampers for each level get set to match.
Wakefield is nearly all single-family homes, so there it’s typically a gas furnace in the basement and a condenser on a pad beside the house. The townhouse rows on the north side of Braddock Road near Wakefield Chapel Road put the furnace in a closet or down on the bottom floor and the outdoor unit out back, so the new pair has to fit the same footprint. In the condo buildings of the Annandale Census place and Woodburn, expect the association to sign off on the outdoor half before it’s ordered.
About three homes in ten across 22003 are rented, four in ten in Woodburn. Virginia law has a landlord keep the heating and any air conditioning they supply in good and safe working order, and Fairfax County expects apartments and leased condos to hold 68 degrees from October 15 to May 1. Swapping an aging pair between leases beats doing it on a January night with a tenant at home.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for a replacement.
| Place | Median home built | Most homes are | Heated with | What the system usually is |
|---|---|---|---|---|
| Annandale | 1967 | single-family houses, about 5 in 10 | gas, about 7 in 10 | Second or third systems, often on the original ductwork. |
| Wakefield | 1968 | single-family houses, nearly all | gas, about 8 in 10 | Second or third systems, often on the original ductwork. |
| Woodburn | 1968 | single-family houses, about 4 in 10 | gas, about 6 in 10 | Second or third systems, often on the original ductwork. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
When it’s time
If those rooms never cooled with the last pair, a bigger new pair won’t fix them. In a 1960s Annandale house it’s usually a small return or a long, leaky branch, and replacement time is when to find out which.
An older house is usually on its third system, still on ductwork laid out for the first. We check the ducts and venting before sizing the new one.
A new outdoor unit needs a matching coil, and on a gas system the coil sits on the furnace. If the furnace is as old, do both and open that closet once.
Permits and sign-offs
Fairfax County lists replacing a heating or cooling system as mechanical permit work. Source.
Fairfax County requires a permit to replace any gas appliance, even like for like: a gas water heater, furnace or boiler. Replacing a fuel-burning appliance also needs a chimney vent certification. Source.
Fairfax County asks for an A2L refrigeration system certification with the permit for any heat pump or air conditioner that runs on the newer A2L refrigerants. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
Ask every company that quotes the job, us included.
A static pressure test, a gauge on the ductwork while the fan runs, tells how much air those ducts can really carry. In houses this age the result sometimes calls for a bigger return before a bigger system.
The old size is a guess somebody made years ago. Ask whether they measure the house and check the ductwork first. Too big short cycles; too small runs all afternoon in August.
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Our free second opinion looks at the system you were quoted on and tells you what it actually needs, with our price if you want it.
Two of our crew going over a work order before the day's calls.
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.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
On spec and on price for our A/C replacement. Showed up on time and all went as promised
Where we work
Next door to Annandale: Falls Church, Springfield, Dunn Loring, Burke and Fairfax.
Questions
Often, yes. Sheet-metal trunks from that era are sturdy; the weak spots tend to be the joints, the boots behind the registers and returns undersized from day one. Fairfax County lists new or replacement duct installation as mechanical permit work, so any duct changes belong on the written price.
If either one needs a big repair, price the pair first; the diagnostic visit is $99. Between tenants, run the HVAC replacement estimator for your range; an empty house is the easiest week for the work.
$8,898 to $23,000 installed for the pair, by size and efficiency. A furnace alone, keeping your AC, is $4,285 to $14,040. The HVAC replacement estimator gives your house its own number.
No. If the AC is young and only the furnace failed, replace the furnace. If they’re the same age, do both: a new outdoor unit needs a matched coil, and one built for the old refrigerant isn’t rated for the new one.
Ready when you are
Call, send the form at the top, or take the HVAC replacement estimator first. We measure before we quote, and if a repair makes more sense than a new system, 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 Annandale 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.