Heat pump replacement in Fairfax.
Heat pump replacement in Fairfax runs $8,499 to $21,650 installed. In Kings Park West, close to half the homeowners heat with electricity.
- The installed range, published
- Sized to the house, not the old label
- Dedicated HVAC team
Get your heat pump priced
Where Fairfax heats with electricity, and where a heat pump joins the gas.
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.
How the houses across Fairfax are heated.
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. |
Fairfax houses, 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.
The City of Fairfax
- Median home built1966 Census
- Built before 1980about 7 in 10 Census
- Built since 2000about 2 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
- Most houses here burn gas, so a heat pump usually means dual fuel: it replaces the air conditioner and the furnace stays as backup.
- Ducts this old were sized for a furnace’s hotter air. A heat pump moves cooler air, and more of it, so check the ducts before picking a size.
The Fairfax County side
Most of the Fairfax Station Census place, in the table, has Fairfax mail, so it counts here.
What heat pump replacement costs in Fairfax.
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
- A gas furnace and air conditioner together, installed$8,898 to $23,000
- Diagnostic visit, when a repair may do$99
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.
When a heat pump in Fairfax is worth replacing.
The upstairs never warms up
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.
The AC quit, and you heat with gas
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’s past 15 years old
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.
The paperwork behind a new heat pump in Fairfax.
How to pick the best heat pump installer in Fairfax.
Questions to ask anybody who quotes you, us included.
Did they price the gas option beside the all-electric one?
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.
Did they size it, or copy the old label?
Copying the old nameplate repeats whatever guess was made when the house was built. The wrong size runs worse in both seasons.
Is the air handler in the price?
A heat pump system is the outdoor unit plus the air handler inside. Ask whether the quote covers both, matched, in writing.
Who sets up the backup heat?
Set wrong, the electric strips run on mild days. Ask who programs the thermostat and at what outdoor temperature the strips may come on.
What our customers say.
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!
5.0 stars across 884 Google reviews. Read them on our reviews page.
Heat pump replacement questions from Fairfax.
Do I need a permit to replace a heat pump in Fairfax?
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.
Can a heat pump keep a 1960s Fairfax house warm?
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.
How much does heat pump replacement cost in Fairfax?
$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.
Should I get a heat pump, or a furnace and air conditioner?
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.
Heat pump replacement in the towns next door.
- Heat pump replacement in Oakton
- Heat pump replacement in Burke
- Heat pump replacement in Vienna
- Heat pump replacement in Annandale
- Heat pump replacement in Clifton
More from SwiftPro in Fairfax
- AC repair in Fairfax
- AC tune-up in Fairfax
- Air duct cleaning in Fairfax
- Dryer vent cleaning in Fairfax
- Ductless mini splits in Fairfax
- Furnace and AC replacement in Fairfax
- Furnace repair in Fairfax
- Furnace replacement in Fairfax
- Furnace tune-up in Fairfax
- Plumbing in Fairfax
- Sewer camera inspection in Fairfax
- Sump pump replacement in Fairfax
- Water heater flush in Fairfax
- Water heaters in Fairfax
See the range first, then your number.
Call, or book online and pick a window. 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 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 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.