Furnace Replacement Cost in Wilmington, Delaware
Furnace replacement in Wilmington runs about $5,700 for a typical job. Basic installs start near $3,200. High-efficiency equipment with duct or electrical work can reach $7,800.
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Wilmington Weather and HVAC Load
Wilmington logs 5,181 heating degree days and 977 cooling degree days in a normal year, based on the closest NOAA weather station. Heating is the bigger job here, and furnaces and heat pumps in Wilmington put in far more hours than the air conditioner. On average, Wilmington gets 87 freezing nights and 17 days above 90°F per year. Snowfall averages about 12 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 60,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| Heating degree days / year | 5,181 |
|---|---|
| Cooling degree days / year | 977 |
| Nights at or below 32°F | 87 |
| Days above 90°F | 17 |
| Average low / high | 45.2°F / 61.6°F |
Wilmington Housing Stock
The median Wilmington home dates to 1946, according to the Census ACS. That makes the typical house about 80 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 46% of occupied homes, roughly 15,000 households. The median home value is $224,500, and median household income is $55,269. We use both figures to adjust labor and pricing for this page.
Between 2020 and 2025, NOAA's Storm Events Database logged 5 hail days and 41 days with damaging thunderstorm winds in New Castle County. 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. New Castle County also had 4 tornado days in that period.
When Replacement Makes Sense
- A repair quote runs past a third of the cost of a new unit
- The furnace is 15 to 20 years old or more
- Some rooms stay cold, the burner short-cycles, or the ignitor keeps failing
- A tech found a cracked heat exchanger, or the CO detector has gone off
What Moves the Price
- Single-stage, two-stage or modulating gas valve
- Condition of the existing ductwork and any changes it needs
- AFUE rating: a basic 80% unit vs. a 96% condensing furnace
- New PVC venting if you move to a condensing model
- Permit and inspection fees, which the local building department sets
- BTU size, which should come from a Manual J load calculation
For Wilmington we kept the national figures close to unchanged, based on local income, home values and climate-based equipment sizing. Get at least three written quotes; real bids can land outside this range.
What the Quote Should Cover
- Gas line and vent connections
- Combustion and safety tests
- Removing and hauling away the old furnace
- The new furnace, filter rack and thermostat wiring
- The permit and the manufacturer warranty registration
Delaware Permits, Efficiency Rules and Rebates
Delaware 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). Expect the contractor to pull a mechanical permit for a replacement job in Wilmington. If a bidder suggests skipping it, move on. Also ask for a Delaware 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
- Ask for the Manual J load calculation in writing. Oversized furnaces are the most common mistake we see.
- Make sure all three quotes are for the same AFUE and staging, or you can't compare them.
- Replace it in early fall if you can. A no-heat emergency in January costs more and leaves you fewer choices.
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Furnace Replacement Questions from Wilmington Homeowners
How much is furnace replacement in Wilmington?
Plan on $3,200 to $7,800, with most jobs near $5,700. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule furnace replacement in Wilmington?
Between late spring and early fall. Wilmington averages 87 freezing nights a year, and heating calls spike from November through February.
Is a high-efficiency furnace worth it?
In cold climates, a 95%+ AFUE furnace usually earns back the price difference in lower gas bills. Where winters are mild, the payback can take a very long time.
How long does a furnace replacement take?
A straight swap is usually done in one day, somewhere between 4 and 10 hours. Moving to a condensing furnace with new PVC venting can add a few more.
Furnace Replacement Near Wilmington
- Dover $3,100 to $7,600
- Newark $3,500 to $8,600
- Middletown $4,100 to $10,000
- Bear $3,600 to $8,700
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Wilmington Porter Research; NOAA Storm Events Database 2020-2025, New Castle County. Prices are our estimates, not contractor quotes. Updated 2026.