HVAC System Replacement Cost in Hillsboro, Oregon
Full HVAC system replacement in Hillsboro runs about $18,100 for a typical job. Basic installs start near $11,000. High-efficiency equipment with duct or electrical work can reach $23,900.
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Hillsboro Weather and HVAC Load
In a normal year, Hillsboro racks up 4,830 heating and 275 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here, and furnaces and heat pumps in Hillsboro put in far more hours than the air conditioner. A normal year brings 64 nights at or below freezing and 17 days over 90°F. Snowfall averages about 3 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 55,000 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 | 4,830 |
|---|---|
| Cooling degree days / year | 275 |
| Nights at or below 32°F | 64 |
| Days above 90°F | 17 |
| Average low / high | 41.5°F / 63.4°F |
Hillsboro Housing Stock
The median Hillsboro home dates to 1997, according to the Census ACS. That makes the typical house about 29 years old. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. About 21,000 households here own their home, 50.6% of the occupied total. Homes here have a median value of $483,400 and households a median income of $103,207. Those two numbers drive the labor adjustment in our estimate.
Washington County had 1 hail day and 1 day with damaging thunderstorm winds from 2020 through 2025, according to NOAA storm records. 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
- Both the heating and cooling equipment are 15 years old or more
- Both units keep needing repairs
- An old R-22 AC paired with an aging furnace
What Moves the Price
- Furnace plus AC, or heat pump plus air handler
- Equipment sized to the house and climate
- Thermostat and zoning upgrades
- Efficiency ratings: SEER2, AFUE and HSPF2
- Duct repair or replacement
- Permits and electrical work
We raised the national figures about 29% for Hillsboro 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
- Duct connections and sealing
- A load calculation and system design
- Startup, testing and warranty registration
- New, matched heating and cooling equipment
- Removing the old equipment
Oregon Permits, Efficiency Rules and Rebates
Oregon 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 Hillsboro; the contractor normally pulls it. Before you sign, ask each bidder for their Oregon 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.
- Replacing both pieces at once usually costs less than two separate jobs a few years apart.
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HVAC System Replacement Questions from Hillsboro Homeowners
How much is full HVAC system replacement in Hillsboro?
Plan on $11,000 to $23,900, with most jobs near $18,100. 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 Hillsboro?
Between late spring and early fall. Hillsboro averages 64 freezing nights a year, and heating calls spike from November through February.
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.
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.
HVAC System Replacement Near Hillsboro
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Portland-Hillsboro Airport; NOAA Storm Events Database 2020-2025, Washington County. Prices are our estimates, not contractor quotes. Updated 2026.