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Replacing a Waterford furnace and AC together runs $8,898 to $23,000 installed. In ZIP 20197, propane heats more than half the owner homes.
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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Rather talk now? (703) 997-9757
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 Waterford
With a median build year of 1996 for owner homes in ZIP 20197, the furnace and air conditioner that came with a typical house are about thirty years old and have worked as a pair since the day they went in. The two share a blower and a duct system, so when both are tired, replacing them together is one install in place of two, with the ducts looked over once.
The Purcellville station logs 4,942 heating degree days in a normal year against 1,049.6 cooling degree days, nearly five times as many on the heating side. That tilts the choice. The furnace half does most of the work in Waterford, so the heating side deserves the most attention when you compare quotes. In a house with an air conditioner past its prime, a heat pump system at $8,499 to $21,650 is the other way to ask the same question.
Propane heats more than half of Waterford’s owner homes, electricity about 23 percent and oil about one in six. Propane is priced like gas, with the furnace set up for the fuel. Some of the electric houses likely run a heat pump already, and for those the matching job is a heat pump system at $8,499 to $21,650 installed. We don’t work on oil burners, but moving an oil house to a propane furnace or a heat pump is ours to price.
The outdoor unit is the half of the pair that stands in the weather. The June 2012 derecho, with winds estimated near 76 mph, snapped many trees along Thicket Court, and July 2025 gusts blew trees down in Waterford, so a pad under a big limb is worth a second look. In the central village, Loudoun’s Waterford Historic District has its review committee approve most exterior changes, and a condenser in a new spot is one.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20197 as a whole: every Waterford address, the village included. The Census place for the village alone has too few homes for steady figures.
When it’s time
When both halves are failing, the diagnostic at $99 tells you which is which. If a furnace and AC from a 1996 house both need parts, put the two repair prices beside the replacement range before you pay for either. The estimator quiz gives your own house its number.
The label on its side names the refrigerant. R-22 hasn’t been made or imported in the US since 2020, so a leak gets expensive. Replace it on your schedule, not in July.
A compressor or heat exchanger on a system past 15 years deserves a replacement price beside it, and you’ll get both numbers.
Permits and sign-offs
Loudoun County requires a permit to swap a gas water heater or furnace. Since October 2025, a replacement that keeps the same BTUs in the same spot needs no plans. 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.
Propane, electric and oil houses need three different answers in Waterford: a propane furnace with a new AC, a heat pump system, or a move off oil that we price but don’t burn. A quote that doesn’t ask has guessed. Ask to see the furnace alone, $4,285 to $14,040, beside the pair.
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.
Hard working crew that removed old system and installed new system in a professional manner.
Where we work
Next door to Waterford: Paeonian Springs, Lovettsville, Hamilton, Leesburg and Purcellville.
Questions
Probably not yet. Replacing only the furnace and keeping your AC is $4,285 to $14,040 installed. Replacing both makes sense when the two are the same age and both need parts. Check the label on each, and weigh the pair against the single furnace before you decide.
Yes. Loudoun County requires a permit to swap a gas furnace, and since October 2025 a swap at the same BTUs in the same spot needs no plans. A bigger furnace or a new location means plans. Ask your installer which one yours is before the old furnace comes out, not after.
$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 Waterford 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.