HVAC System Replacement Cost in Farmington Hills, Michigan
Expect to pay $11,200 to $24,400 for full HVAC system replacement in Farmington Hills, MI. Most homeowners end up near $18,500, depending on the equipment tier and how much of the old setup can be reused.
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Farmington Hills Weather and HVAC Load
NOAA's 1991-2020 climate normals put Farmington Hills at 6,867 heating degree days and 572 cooling degree days per year. Heating is the bigger job here, and furnaces and heat pumps in Farmington Hills put in far more hours than the air conditioner. On average, Farmington Hills gets 146 freezing nights and 11 days above 90°F per year. Snowfall averages about 36 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 | 6,867 |
|---|---|
| Cooling degree days / year | 572 |
| Nights at or below 32°F | 146 |
| Days above 90°F | 11 |
| Average low / high | 37.7°F / 57.6°F |
Farmington Hills Housing Stock
Half the homes in Farmington Hills were built before 1978 (Census ACS median), so the typical house is about 48 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, 64% of the occupied total. Homes here have a median value of $333,200 and households a median income of $101,863. Those two numbers drive the labor adjustment in our estimate.
Between 2020 and 2025, NOAA's Storm Events Database logged 9 hail days and 41 days with damaging thunderstorm winds in Oakland County. The largest hail reported was 1.25 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. Oakland County also had 4 tornado days in that period. In Farmington Hills, 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 the heating and cooling equipment are 15 years old or more
- Both units keep needing repairs
- Some rooms are uncomfortable, and the energy bills are high
What Moves the Price
- Efficiency ratings: SEER2, AFUE and HSPF2
- Thermostat and zoning upgrades
- Duct repair or replacement
- Furnace plus AC, or heat pump plus air handler
- Permits and electrical work
- Equipment sized to the house and climate
We raised the national figures about 32% for Farmington Hills 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. Plan on a mechanical permit for most replacements in Farmington Hills; the contractor normally pulls it. Before you sign, ask each bidder for their Michigan 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 every bidder quote the same efficiency ratings, or the prices won't compare.
- Get one quote for a heat pump system and one for a furnace plus AC.
- 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 Farmington Hills Homeowners
How much is full HVAC system replacement in Farmington Hills?
Plan on $11,200 to $24,400, with most jobs near $18,500. 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 Farmington Hills?
Between late spring and early fall. Farmington Hills averages 146 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 Farmington Hills
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Farmington; NOAA Storm Events Database 2020-2025, Oakland County. Prices are our estimates, not contractor quotes. Updated 2026.