Open 24/7 for emergencies
Heat pump replacement in Fairfax runs $8,499 to $21,650 installed. In Kings Park West, close to half the homeowners heat with electricity.
Price range
$8,499-$21,650
8yrs @ 7.99%
$120/mo
15yrs @ 9.99%
$91/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 an electric heat strip kit, the backup heat inside a heat pump’s air handler.
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
The same price book as our heating page and the HVAC estimator, for a heat pump and air handler, 2 to 5 ton.
A heat pump system, outdoor unit and air handler, installed
$8,499 to $21,650
or $142/mo at 0% APR for 60 months
A gas furnace and air conditioner together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Diagnostic visit, when a repair may do
$99
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
Might it be a repair? The diagnostic visit is $99, and the tech prices the repair and the replacement side by side. Financing is available, subject to approval.
With Comfort+ membership at $199 a year, the diagnostic visit is included, and half of each repair bill is banked toward replacing that system, up to $1,500.
What’s different in Fairfax
Electric heat in the Census usually means a heat pump in these parts, and the Fairfax address splits on it. In Kings Park West, a neighborhood of 1970s houses and townhouses, close to half the homeowners heat with electricity. Across the county side as a whole it’s about a third, and inside the City of Fairfax about a quarter.
Fair Oaks and Merrifield sit at about a third too, and there condo buildings hold half the homes or more. In a condo the heat pump is often the only heat the unit has: the air handler in a closet, the outdoor unit on a balcony, a roof or a shared pad. The new one has to fit where the old one sat, and the association gets a say in that.
Where the house has gas, which is most of the City and Mantua, a heat pump usually goes in where the air conditioner was. It heats on mild days and hands the coldest nights to the gas furnace, so one outdoor unit does the cooling and most of the heating. That pairing is called dual fuel, and Washington Gas pays toward it; our dual fuel guide has the current amounts and who qualifies.
A Kings Park West heat pump from the 1990s or early 2000s most likely runs on R-22, and a leak on one of those is usually where repairs stop making sense. The label on the side of the outdoor unit names the refrigerant, so check it before deciding on a repair.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for a heat pump.
| Place | Median home built | Most homes are | Heated with | What a heat pump job usually looks like |
|---|---|---|---|---|
| Fair Oaks | 1995 | condo and apartment buildings, about 5 in 10 | gas, about 6 in 10 | Condo and apartment buildings: compact closet systems, and the association decides where an outdoor unit goes. |
| City of Fairfax | 1966 | single-family houses, about 5 in 10 | gas, about 7 in 10 | Older gas houses, where a heat pump pairs with the furnace once the ducts are checked. |
| Fairfax Station | 1982 | single-family houses, about 9 in 10 | gas, about 5 in 10 | 1980s and 90s gas houses, most on a second air conditioner, the part a heat pump would replace. |
| Kings Park West | 1976 | single-family houses, about 7 in 10 | gas, about 5 in 10 | Older gas houses, where a heat pump pairs with the furnace once the ducts are checked. |
| Merrifield | 1990 | condo and apartment buildings, about 6 in 10 | gas, about 6 in 10 | Condo and apartment buildings: compact closet systems, and the association decides where an outdoor unit goes. |
| Fair Lakes | 1998 | townhouses, about 3 in 10 | gas, about 7 in 10 | 1980s and 90s gas houses, most on a second air conditioner, the part a heat pump would replace. |
| Long Branch | 1968 | single-family houses, about 9 in 10 | gas, about 7 in 10 | Older gas houses, where a heat pump pairs with the furnace once the ducts are checked. |
| Mantua | 1968 | single-family houses, about 7 in 10 | gas, about 7 in 10 | Older gas houses, where a heat pump pairs with the furnace once the ducts are checked. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise. A heat pump counts as electric heat.
Most of the Fairfax Station Census place, in the table, has Fairfax mail, so it counts here.
When it’s time
Heat pump air feels cooler than a furnace’s, and long run times are normal. But rooms that stay cold after hours of running usually point at airflow or a tired compressor. A $99 diagnostic visit sorts out which before anybody prices a replacement.
A heat pump can go where the air conditioner sat, heat on mild days and leave the cold nights to the furnace. That’s dual fuel.
It heats all winter and cools all summer, so it piles up hours an air conditioner never sees. Past 15 years, price the replacement beside any big repair.
Permits, locally
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
Questions to ask anybody who quotes you, us included.
If the house already has a gas furnace, a heat pump paired with it is one choice and a full heat pump system with an air handler is another. Ask for both prices, side by side, before you pick.
Copying the old nameplate repeats whatever guess was made when the house was built. The wrong size runs worse in both seasons.
A heat pump system is the outdoor unit plus the air handler inside. Ask whether the quote covers both, matched, in writing.
Set wrong, the electric strips run on mild days. Ask who programs the thermostat and at what outdoor temperature the strips may come on.
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.
I would gladly recommend them to anyone in the greater Fairfax/Alexandria area without reservation.
Swiftpro came out the same day I called when my AC was out and had it fixed in less than an hour after arriving.
Moises and Oscar did a superlative job doing a custom installation of a new HVAC unit in a tight basement space. And they then took the time to go over system operation. Top tier job and service in all respects!
Questions
On the county side, yes: Fairfax County lists replacing a heating or cooling system as mechanical permit work, and a new unit on the A2L refrigerants needs a refrigeration certification with it. Inside the City of Fairfax, the City’s own permit office handles it.
A properly sized one can, especially paired with the gas furnace already there. The bigger question in an older City or Mantua house is the ductwork: a heat pump moves more air at a lower temperature than a furnace, and ducts sized for a furnace sometimes need work first. We measure them before quoting.
$8,499 to $21,650 installed for a heat pump system, the outdoor unit and the air handler, 2 to 5 ton. A small single-stage system lands near the bottom, a big variable-speed one near the top. The HVAC estimator narrows it to your house.
A heat pump system runs $8,499 to $21,650 installed; a gas furnace and air conditioner together, $8,898 to $23,000. No gas line usually means a heat pump. With gas, you can keep the furnace and add one; our heat pump vs gas furnace guide runs the numbers.
Ready when you are
Call, or send the form at the top. The price is in writing before the old unit comes out, and if a repair makes more sense, 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 Fairfax 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.