What HVAC replacement costs in Northern Virginia

Real quotes from Northern Virginia homes

These are actual written replacement quotes from two Northern Virginia contractors, for homes in Ashburn and Manassas. We removed the homeowners’ and contractors’ names. Prices are the final totals on each quote.

A handful of real quotes, not a market survey. Optional add-ons offered alongside the Ashburn quote (surge protection, duct cleaning, an air purifier, a media filter cabinet) ran $439 to $1,536 each and are not included in its prices above.

What these quotes show

• The cheapest and most expensive quotes were for the same kind of system. The Ashburn entry option and the Manassas quotes are all a central AC with an 80% gas furnace. The Manassas quote was about $9,000 higher, and it bundled a UV light, a premium filter and duct work that the other did not.
• Moving up an efficiency tier adds real money. At one contractor, going from a 16 SEER AC to a 23 SEER variable-speed heat pump added $6,177.
• Discounts can be large. One quote listed about $5,960 in discounts, credits and rebates already applied. A big discount tells you little about whether the final price is fair.

What drives the price

1. The type of system

Most Northern Virginia homes have one of three setups: a central air conditioner with a gas furnace, an all-electric heat pump with an air handler, or a dual-fuel system (a heat pump with a gas furnace for the coldest days). Replacing like for like is usually the least expensive. Switching types can add electrical, gas or duct work.

2. Efficiency and stages

Higher efficiency ratings and two-stage or variable-speed equipment cost more up front and run more quietly and evenly. Since 2023, efficiency is rated in SEER2, which reads a little lower than the older SEER number for the same unit, and some quotes still list SEER. When you compare, make sure both quotes use the same rating.

3. Size

Bigger equipment costs more, and bigger is not better. An oversized air conditioner cools the house fast, shuts off, and leaves the air damp. The size should come from a room-by-room Manual J load calculation, not from the size of the old unit.

4. The work around the equipment

This is where quotes quietly differ. Replacing the refrigerant line set versus reusing it, adding or enlarging a return duct, a new electrical disconnect or circuit, gas piping and venting changes, a new condensate pump, and a new pad all add cost. A low quote that reuses everything is not the same job as one that replaces what your home needs.

5. Add-ons and warranty

UV lights, air cleaners, media filter cabinets, surge protectors and smart thermostats are often bundled into the total. Labor warranties also vary: 1, 3, 5 and 10 years are all common, and longer coverage usually costs more.

6. Access and timing

An air handler in a tight attic or a furnace in a finished basement takes more labor. Emergency replacements during a heat wave or cold snap leave little room to compare.

What a complete quote should include

Before comparing totals, check that each quote spells out:

• Exact model numbers for the outdoor unit, indoor coil or air handler, and furnace, so you can look up the efficiency and warranty
• The system size in tons (cooling) and BTU (heating), and how it was determined
• Whether the refrigerant line set is replaced or reused (and flushed), and which refrigerant the new system uses
• Any duct changes, especially to the return side
• Electrical, gas, venting and condensate work
• The permit and inspection, removal of the old equipment, and a new pad
• Parts and labor warranty, in years, and who honors them
• Start date, payment schedule and what is due at signing

Our guide to comparing HVAC quotes walks through the questions that expose the differences. You can also see a sample side-by-side comparison of three bids on the same scope.

Rebates and tax credits (as of November 2026)

• Federal tax credit: the 25C energy efficient home improvement credit, which covered heat pumps, central air and furnaces, ended for equipment placed in service after December 31, 2025. Systems installed in 2026 don’t qualify.
• Virginia home energy rebates: the state’s federally funded HEAR and HOMES programs are not open yet. Virginia Energy says launch depends on federal approval, and plans call for up to $8,000 toward a heat pump for income-qualified households. Work started before launch may not qualify.
• Washington Gas: customers can save up to $800 through the Home Energy Savings Program. In Virginia, the work must be done by a contractor in the program’s network.
• Columbia Gas of Virginia: up to $500 for a gas furnace rated 90% AFUE or higher in an existing home heated mainly by gas, bought and installed in 2026. Apply within 120 days or by January 31, 2027, whichever comes first. Funds are first come, first served.
• Dominion Energy Virginia: no rebate is currently listed for central heat pumps or air conditioners. Dominion offers smart thermostat rewards and an income- and age-qualifying program.

Rebate terms change often. Confirm the current terms with the utility before you buy.

How to get a fair price

1. Get the house measured first. A Manual J load calculation tells you the size you actually need, so no bid can talk you into a bigger system.
2. Write down the scope. Decide what work the job includes (line set, returns, electrical) before contractors price it.
3. Get at least three bids on that same scope. Then differences in price are differences in price, not in the job.
4. Price add-ons separately. Decide on UV lights and air cleaners on their own merits, after the core system.

That is exactly what 1Stop does for homeowners in Loudoun, Fairfax and Prince William counties, at no cost: a free independent assessment, one written scope, and bids from vetted local contractors you can compare line by line.