HVAC System Replacement Cost in Des Plaines, Illinois
Full HVAC system replacement in Des Plaines runs about $17,300 for a typical job. Basic installs start near $10,500. High-efficiency equipment with duct or electrical work can reach $22,800.
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Des Plaines Weather and HVAC Load
NOAA's 1991-2020 climate normals put Des Plaines at 5,974 heating degree days and 1,003 cooling degree days per year. Heating is the bigger job here, and furnaces and heat pumps in Des Plaines put in far more hours than the air conditioner. A normal year brings 121 nights at or below freezing and 17 days over 90°F. Snowfall averages about 38 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 65,000 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 | 5,974 |
|---|---|
| Cooling degree days / year | 1,003 |
| Nights at or below 32°F | 121 |
| Days above 90°F | 17 |
| Average low / high | 43°F / 59.5°F |
Des Plaines Housing Stock
Census figures put the median build year in Des Plaines at 1966, so a typical house here has about 60 years on it. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. Des Plaines has roughly 18,000 owner-occupied homes, or 79.4% of households. The median home value is $318,200, and median household income is $94,303. We use both figures to adjust labor and pricing for this page.
Between 2020 and 2025, NOAA's Storm Events Database logged 27 hail days and 75 days with damaging thunderstorm winds in Cook County. The largest hail reported was 2.75 inches across. Hail flattens the thin aluminum fins on condenser coils and cuts airflow. After a big storm, take a look at the outdoor unit; homeowners insurance often covers the damage. Cook County also had 8 tornado days in that period. In Des Plaines, 20.4% of residents are 65 or older. For older adults, a house with no heat in January or no AC during a heat wave is a medical risk. Mention it when you call, since many companies put those calls first.
When Replacement Makes Sense
- Both units keep needing repairs
- Both the heating and cooling equipment are 15 years old or more
- Some rooms are uncomfortable, and the energy bills are high
What Moves the Price
- Efficiency ratings: SEER2, AFUE and HSPF2
- Equipment sized to the house and climate
- Permits and electrical work
- Duct repair or replacement
- Thermostat and zoning upgrades
- Furnace plus AC, or heat pump plus air handler
For Des Plaines we raised the national figures about 23%, 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
- Startup, testing and warranty registration
- A load calculation and system design
- New, matched heating and cooling equipment
- Removing the old equipment
- Duct connections and sealing
Illinois Permits, Efficiency Rules and Rebates
Illinois falls in the DOE's North region. New split central air conditioners must meet at least 13.4 SEER2, and heat pumps sold anywhere in the U.S. need 14.3 SEER2 and 7.5 HSPF2. Equipment replacements in Des Plaines generally need a mechanical permit, and a reputable contractor will pull it for you. Ask for their Illinois license or registration number and a certificate of insurance with the quote. 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
- Get one quote for a heat pump system and one for a furnace plus AC.
- Make every bidder quote the same efficiency ratings, or the prices won't compare.
- Ask for a duct leakage test. Leaky ducts can lose 20 to 30% of what the system puts out.
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HVAC System Replacement Questions from Des Plaines Homeowners
How much is full HVAC system replacement in Des Plaines?
Plan on $10,500 to $22,800, with most jobs near $17,300. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule full HVAC system replacement in Des Plaines?
Between late spring and early fall. Des Plaines averages 121 freezing nights a year, and heating calls spike from November through February.
How often should an HVAC system be replaced?
Most systems get replaced every 15 to 20 years. AC units and heat pumps usually wear out before gas furnaces do.
Can I replace only the AC and keep my furnace?
Yes, as long as the indoor coil and blower work with the new AC. A mismatched system loses efficiency and can void the warranty.
HVAC System Replacement Near Des Plaines
- Mount Prospect $11,100 to $24,200
- Skokie $10,900 to $23,700
- Orland Park $10,800 to $23,500
- Palatine $11,100 to $24,100
- Oak Lawn $9,700 to $21,200
- Decatur $8,000 to $17,400
- Bolingbrook $10,800 to $23,600
- Berwyn $9,600 to $20,900
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Chicago Ohare International Airport; NOAA Storm Events Database 2020-2025, Cook County. Prices are our estimates, not contractor quotes. Updated 2026.