HVAC System Replacement Cost in Ann Arbor, Michigan
Our 2026 estimate for full HVAC system replacement in Ann Arbor, MI is $10,900 to $23,800. That puts Ann Arbor 29% above the national average, mainly because of higher incomes and home values, which push labor rates up and the bigger heating equipment this climate calls for.
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Ann Arbor Weather and HVAC Load
Ann Arbor logs 6,680 heating degree days and 594 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 Ann Arbor put in far more hours than the air conditioner. Count on roughly 147 nights below 32°F and 14 afternoons past 90°F in a typical year. Snowfall averages about 59 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 70,000 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 | 6,680 |
|---|---|
| Cooling degree days / year | 594 |
| Nights at or below 32°F | 147 |
| Days above 90°F | 14 |
| Average low / high | 37.5°F / 58.9°F |
Ann Arbor Housing Stock
The median Ann Arbor home dates to 1971, according to the Census ACS. That makes the typical house about 55 years old. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. About 23,000 households here own their home, 45.6% of the occupied total. The median home value is $435,100, and median household income is $81,089. We use both figures to adjust labor and pricing for this page.
Washtenaw County had 9 hail days and 26 days with damaging thunderstorm winds from 2020 through 2025, according to NOAA storm records. The largest hail reported was 2 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.
When Replacement Makes Sense
- Both units keep needing repairs
- Some rooms are uncomfortable, and the energy bills are high
- Both the heating and cooling equipment are 15 years old or more
What Moves the Price
- Permits and electrical work
- Thermostat and zoning upgrades
- Duct repair or replacement
- Furnace plus AC, or heat pump plus air handler
- Efficiency ratings: SEER2, AFUE and HSPF2
- Equipment sized to the house and climate
We raised the national figures about 29% for Ann Arbor 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
- New, matched heating and cooling equipment
- A load calculation and system design
- Removing the old equipment
- Duct connections and sealing
- Startup, testing and warranty registration
Michigan Permits, Efficiency Rules and Rebates
Michigan 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 Ann Arbor generally need a mechanical permit, and a reputable contractor will pull it for you. Ask for their Michigan 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
- Ask for a duct leakage test. Leaky ducts can lose 20 to 30% of what the system puts out.
- 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.
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HVAC System Replacement Questions from Ann Arbor Homeowners
How much is full HVAC system replacement in Ann Arbor?
Plan on $10,900 to $23,800, with most jobs near $18,000. 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 Ann Arbor?
Between late spring and early fall. Ann Arbor averages 147 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 Ann Arbor
- Sterling Heights $9,900 to $21,600
- Lansing $8,400 to $18,300
- Warren $8,900 to $19,300
- Dearborn $9,100 to $19,900
- Grand Rapids $9,400 to $20,400
- Livonia $10,700 to $23,300
- Detroit $8,300 to $18,000
- Troy $11,900 to $26,000
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Ann Arbor; NOAA Storm Events Database 2020-2025, Washtenaw County. Prices are our estimates, not contractor quotes. Updated 2026.