How Much Does a Full HVAC System Replacement Cost in Northern Virginia?

Last updated: October 2026
A full HVAC system replacement in Northern Virginia typically costs about $3,600 to $12,000 for a furnace and AC, $3,850 to $12,100 for a heat pump system and $4,150 to $12,450 for a dual-fuel system, depending on the efficiency tier you choose. Ductwork, permits and labor can add more. AVS gives a free itemized estimate: Virginia 703-457-9028, Maryland 301-686-7129.

Figures come from AVS’s own tier pricing and cost guides, so treat them as typical ranges rather than a quote. Written by the AVS Heating and Air Conditioning team. Virginia HVAC license 2705039269A, Maryland HVAC license 520714137895.

HVAC System Replacement Cost in Northern Virginia

The HVAC system replacement cost for your home depends on three choices: the type of system, the efficiency tier and whether your ductwork can be reused. The table below shows AVS’s typical range for each combination.

If you want the whole job priced by scope instead, AVS’s cost guide groups it this way: a replacement in one to two days runs about $4,820 to $9,350, and a job that includes ductwork takes three to seven days at about $6,820 to $12,350. You can see the full breakdown in the AVS HVAC cost guides.

Furnace and AC vs Heat Pump vs Dual Fuel: What Each Costs and Does

Furnace and AC replacement is the most common full system in homes with gas service. The furnace heats, the air conditioner cools, and both share one set of ducts. If you are pricing a furnace on its own, our furnace installation page covers that job.

Heat pump system replacement handles both heating and cooling with one outdoor unit and an indoor air handler. It is priced close to a furnace and AC at every tier, and it removes the gas appliance from the picture.

Dual-fuel replacement pairs a heat pump with a gas furnace. The heat pump does the work in mild weather, and the furnace takes over when winter temperatures drop. It costs the most of the three, and it suits homes that already have gas service and want a backup for the coldest weeks.

Basic, Better or Best: Which HVAC Tier Fits Your Home?

Basic equipment keeps the upfront price low, with furnaces starting at AFUE 80 in AVS’s tier guide. It suits a home you may sell soon or a tight budget.

Better adds higher efficiency, with furnaces rated AFUE 94 to 97 and cooling rated SEER 16 to 20 in AVS’s tier guide. It is the middle ground most homeowners compare first.

Best is the top tier, with furnaces rated AFUE 97 to 98.5 and cooling rated SEER 19 to 26. It costs the most to buy and is built for homeowners who plan to stay long enough to benefit from lower running costs.

Ask every installer to name the exact models in each tier. Quotes that name different equipment cannot be compared on price alone.

AC Only vs Furnace Only vs Full System Replacement

You do not always need the whole system. If only the air conditioner has failed and the furnace is newer, replacing the AC alone is often enough, and our AC installation team can price it. If the furnace has failed and the AC is younger, a furnace-only job may do.

A full replacement makes sense when both units are near the end of their life or when the indoor and outdoor parts no longer match. Mixing old and new equipment can leave you with a system that never reaches the efficiency on the label. When the two halves are similar in age, replacing them together also means one permit, one visit and one warranty start date.

What a Full HVAC Replacement Includes

Compare quotes against this checklist, because a low total often leaves items out.

• Equipment: outdoor unit, indoor coil, furnace or air handler.
• Refrigerant lines and electrical connections matched to the new equipment.
• Pad or mounting for the outdoor unit.
• Thermostat: a new one costs about $329 to $567 in AVS’s guide.
• Permit and inspection pulled by the installer.
• Removal and disposal of the old system, which runs about $60 to $500.
• Startup, testing and a walkthrough before the crew leaves.

Ductwork, Permits and Labor: The Costs Quotes Often Skip

Ductwork is the biggest swing factor. Reusing sound ducts costs nothing extra, while new ducts add about $2,500 to $10,000. When ductwork and other add-ons are part of the project, AVS’s guide puts the total at about $13,000 to $17,000 over four to eight days.

Permits are required for this work. Fairfax County lists new and replacement HVAC systems under its residential mechanical permit and recommends that a licensed contractor pull it. In AVS’s guide, permit costs run about $400 to $1,500, and inspections follow once work begins.

Labor runs about $75 to $250 per hour in our guide, and peak-season jobs can cost around 30% more. Scheduling in a quieter month can help.

How Long Does a Full HVAC Replacement Take?

Your crew will confirm the schedule after the in-home visit, since access to the attic or basement affects the timing.

Signs It’s Time to Replace the Whole System

Repair bills keep climbing. If you are paying for a major repair every season, the money is better spent on new equipment.

The system is near the end of its life. Furnaces last about 15 to 25 years, according to AVS’s cost guide.

Comfort has slipped. Uneven rooms, short cycling and rising energy bills often point to equipment that can no longer keep up.

A major part has failed on an older system. A cracked heat exchanger or a failed compressor on aging equipment is a good moment to price replacement next to repair.

If you are not sure, a free in-home look is the quickest way to compare repair and replacement costs for your house.

Rebates and Incentives for a New HVAC System in 2026

The federal 25C efficiency credit no longer applies to equipment placed in service after December 31, 2025, so do not count on it when comparing quotes. Dominion Energy Virginia lists a smart thermostat rebate and an income- and age-qualifying program on its Save Energy page, and it offers a Rebate Finder tool for current offers. Programs change often, so check the amount and deadline before you buy and ask your installer which ones apply to your equipment.

Financing a New HVAC System

A full replacement is a large expense, so most homeowners spread it out. AVS offers financing with a quick credit decision, flexible terms and low interest. Ask for the financing details at the same time as your estimate so you can compare monthly payments across tiers.

How to Read an HVAC Replacement Quote

Look for line items. Equipment, labor, ductwork, permit and removal should each appear separately.

Match the model numbers. A quote with no model numbers cannot be compared with anything else.

Check the license. Ask any installer for their license numbers. Ours are listed at the top of this page.

Compare the warranty. Equipment and labor warranties are separate, so ask for both in writing.

Be careful with very low prices. A total far below the others often means smaller equipment, no permit or missing line items.

Why Choose AVS for Your HVAC Replacement

Since 1991, AVS has worked out of Fairfax, Falls Church and Bethesda offices. Our NATE-certified technicians handle furnace, AC, heat pump and dual-fuel replacements, and our line is open 24/7 with no extra charge for evenings, weekends or holidays. For a written estimate on your house, contact AVS, or see how we plan a smaller job in our guide on central heating installation cost. You can also start from the AVS Heating and Air Conditioning home page.

Frequently Asked Questions

How much does it cost to replace the HVAC system in a 2,000 square foot house?

Most of the price comes from the tier you pick, not the square footage alone. Using AVS’s tier ranges, a furnace and AC for a home this size falls between about $3,600 and $11,750. A rough sizing rule of 30 to 45 BTU per square foot points to a 60,000 to 90,000 BTU heating load, but a load calculation at your house gives the real number.

Can a 14 SEER2 air conditioner still be installed in Virginia?

For most homes, no. The U.S. Department of Energy places Virginia in the Southeast region, where split-system air conditioners under 45,000 BTU per hour must reach SEER2 14.3, and heat pumps must reach SEER2 14.3 nationwide. Larger air conditioners have a 13.8 minimum. SEER and SEER2 are measured differently, so do not compare the two numbers directly.

What is the cheapest time of year to replace an HVAC system?

Carrier names spring and fall as the best windows, because contractors are less busy and schedules are easier. Replacing during an extreme heat wave or cold snap usually means longer waits and, as noted above, peak labor pricing.

Is it cheaper to buy HVAC equipment online and hire someone to install it?

Rarely. The equipment price is only part of the bill, and a mismatched or wrongly sized unit can cost more to fix than you saved. Labor warranties can differ when the installer did not supply the equipment, and the county recommends a licensed contractor for the permit, so ask about both. Ask for one installed price with equipment, labor and permit included.

What can I do if I can’t afford to replace my HVAC system right now?

Start with a repair quote and ask how many seasons the repair should last. You can also spread the cost with financing, or replace the failed half first if the other half is still in good shape. Fairfax County Family Services runs energy assistance for eligible households at 703-324-7500, though it helps with heating and cooling bills rather than replacement.

Can I get an emergency HVAC replacement right away?

Call AVS at any hour, since our line is open 24/7 every day of the year. We do not charge extra for evenings, weekends or holidays, and the timing of a full replacement depends on equipment availability and the scope of the job.

Get a Free HVAC Replacement Estimate

Ready to price a new system? Call AVS for a free itemized estimate anywhere in Northern Virginia or Maryland, and we will show you the options for your home.

Virginia: 703-457-9028. Maryland: 301-686-7129.