Furnace Replacement Cost in Washington, District of Columbia

Washington Weather and HVAC Load

In a normal year, Washington racks up 4,048 heating and 1,648 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here, and furnaces and heat pumps in Washington put in far more hours than the air conditioner. Count on roughly 84 nights below 32°F and 48 afternoons past 90°F in a typical year. Snowfall averages about 10 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 50,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.

Washington Housing Stock

The median Washington home dates to 1957, according to the Census ACS. That makes the typical house about 69 years old. Houses that old often still have duct runs sized for an old coal or oil furnace and 60- or 100-amp electrical panels. Both can add cost when new equipment goes in. Owners live in 41.1% of occupied homes, roughly 132,000 households. With a median household income of $106,287 and a median home value of $724,600, local labor rates come out above the national middle in our model.

District of Columbia had 1 hail day and 44 days with damaging thunderstorm winds from 2020 through 2025, according to NOAA storm records. The largest hail reported was 1 inches across. Storms here are more likely to cause power surges than coil damage, so a surge protector on the outdoor unit is worth the small cost.

When Replacement Makes Sense

• The furnace is 15 to 20 years old or more
• A tech found a cracked heat exchanger, or the CO detector has gone off
• A repair quote runs past a third of the cost of a new unit
• Some rooms stay cold, the burner short-cycles, or the ignitor keeps failing

What Moves the Price

• BTU size, which should come from a Manual J load calculation
• AFUE rating: a basic 80% unit vs. a 96% condensing furnace
• Single-stage, two-stage or modulating gas valve
• Permit and inspection fees, which the local building department sets
• New PVC venting if you move to a condensing model
• Condition of the existing ductwork and any changes it needs

We raised the national figures about 39% for Washington using local income, home values and the equipment size this climate needs. Real bids can still come in outside the range, so collect three written quotes.

What the Quote Should Cover

• Combustion and safety tests
• The new furnace, filter rack and thermostat wiring
• Gas line and vent connections
• Removing and hauling away the old furnace
• The permit and the manufacturer warranty registration

District of Columbia Permits, Efficiency Rules and Rebates

District of Columbia is in the DOE's Southeast region, where new split central air conditioners need at least 14.3 SEER2 (13.8 SEER2 for systems of 45,000 BTU/h and up). Plan on a mechanical permit for most replacements in Washington; the contractor normally pulls it. Before you sign, ask each bidder for their District of Columbia license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.

Before You Hire

• Make sure all three quotes are for the same AFUE and staging, or you can't compare them.
• Look up utility rebates on 95%+ AFUE units before you buy.
• Ask for the Manual J load calculation in writing. Oversized furnaces are the most common mistake we see.

Furnace Replacement Questions from Washington Homeowners

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