Open 24/7 for emergencies
Furnace and AC replacement in Broad Run runs $8,898 to $23,000 installed. The middle owner home here was built in 1979.
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
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
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 Broad Run
The middle owner home in ZIP 20137 dates from 1979. About one in six was built before 1960, just over half before 1980, about one in three from 1980 to 1999, and the smallest group, about one in seven, since 2000. A house from the first two groups is on its second or third furnace and AC, and one from 1980 to 1999 is at the age when both halves start giving out together.
Which pair depends on the fuel. Close to three owners in ten burn propane, and there a propane furnace with an air conditioner is the usual match. Just over half heat with electricity, which points to a heat pump system, $8,499 to $21,650; the Census lumps heat pumps in with all electric heat, so it can’t count them. It finds no owner home on utility gas.
About one owner home in seven heats with oil, and we don’t work on oil burners. A house on oil needs a change of fuel instead: a propane furnace with a tank from a supplier, or a heat pump system. Both are ours to price, and that choice is where the quote swings, so tell the estimator what you heat with now.
At Warrenton 3 SE, heating degree days run better than four to one over cooling ones, and Fauquier County sizes heating to a 17 degree design night. Ducts from a later central-air retrofit in an older house were often sized for heat alone, and they cap what a new pair can deliver. Have the ducts looked at before anyone sizes the pair.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20137 as a whole: every Broad Run address. About one home in six of them is on the Prince William County side.
When it’s time
A cold bedroom in January and a hot one in July points at airflow as much as equipment. If repairs have piled up on both halves within a few seasons, the diagnostic, $99, gives you the repair list to hold against a replacement range.
Where a lot of homes heat with electricity, the indoor half is often an air handler, and the like-for-like swap is a heat pump system, $8,499 to $21,650 installed.
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.
Permits and sign-offs
Fauquier County counts swapping an electric appliance for a similar one in the same spot as an ordinary repair that needs no permit. Moving an appliance to a new spot takes one. Source.
Fauquier County wants a permit for any fuel-fired appliance, so a gas or propane furnace replacement is permit work even in the same spot. Trade permits need no plans, and usually no zoning approval. Source.
Outside the town limits, Fauquier County issues the permit. It wants one for any fuel-fired water heater, propane included, and for any heater being moved; an electric one swapped for a similar unit in the same spot counts as an ordinary repair. Trade permits go out over the counter the day the application comes in. Source.
Prince William County requires a permit to replace a gas or propane furnace or a gas appliance such as a water heater, even like for like. Replacing an electric water heater with one the same size in the same spot needs no permit. 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.
With just over half of Broad Run’s owner homes already on electric heat, a heat pump system at $8,499 to $21,650 is a real alternative to a propane furnace with an AC. Ask for both numbers, and for what the propane tank and the electrical panel each need, then compare.
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.
Alex was very professional and the 2 technicians Oscar, and Derek was fast and efficient. They replace my A/C unit within the next day
Where we work
Next door to Broad Run: The Plains, Haymarket, Gainesville, Marshall and Warrenton.
Questions
Between $8,898 and $23,000 installed, depending on the equipment’s size and efficiency. The HVAC estimator quiz asks about your house and your heat and gives it its own number. Keeping the AC you have and replacing only the furnace runs $4,285 to $14,040. The heating page shows the choices.
The furnace half burns fuel, and Fauquier County wants a permit for any fuel-fired appliance, even in the same spot. Prince William County asks for one to replace a gas or propane furnace like for like. An electric heat pump or condensing unit swapped for the same type in the same spot is an ordinary repair in both.
$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 Broad Run 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.