Furnace and AC replacement in Annandale.
A new furnace and air conditioner in Annandale run $8,898 to $23,000 installed, sized for the 1960s house as it stands today.
- Your price range up front
- Sized to the house, not the old label
- Dedicated HVAC team
Get your new system priced
Annandale’s median house dates from 1967, and its ducts usually do too.
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.
The systems across Annandale, place by place.
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. |
Annandale houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Annandale
- Built before 1980about 8 in 10 Census
- Built since 2000about 1 in 10 Census
- Most homes aresingle-family houses, about 5 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedabout 3 in 10 Census
- Houses this age are usually on their second or third system, often on the original ductwork.
- Most homes here heat with gas, so the usual pair is a gas furnace inside and an air conditioner outside, with the coil sitting on the furnace.
What a new furnace and AC costs in Annandale.
$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
- Furnace alone, keeping your AC$4,285 to $14,040
- Heat pump system instead$8,499 to $21,650
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.
When replacing both makes sense in Annandale.
The far bedrooms ran warm on the old system too
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.
Third system, original ducts
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.
The AC died and the furnace is the same age
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.
Who signs off on a new system in Annandale.
Fairfax County
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.
How to pick who replaces your furnace and AC in Annandale.
Ask every company that quotes the job, us included.
Will they measure the airflow before they size anything?
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.
Do they size it to the house, or copy the old label?
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.
Is the whole job in the written price?
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Already holding another company’s quote?
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.
What our customers say.
On spec and on price for our A/C replacement. Showed up on time and all went as promised
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Annandale.
Is the original ductwork in a 1960s Annandale house worth keeping?
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.
My Annandale rental’s furnace and AC are both near twenty. Replace now or wait?
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.
How much does a new furnace and AC cost in Annandale?
$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.
Do I have to replace both at the same time?
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.
More from SwiftPro in Annandale.
More from SwiftPro in Annandale
Start with your number, then a written quote.
Call, book online, 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 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 884 Google reviews. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
SwiftPro Heating, Cooling & Plumbing, 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151, (703) 997-9757. Book online, read our reviews, or see every town we serve.