Quick answerFurnace replacement in Spokane starts with a load calculation to size the new unit, then removal of the old furnace, a new high-efficiency or standard furnace set and vented, gas and electrical connections, a combustion test and the Washington mechanical permit. Most replacements are finished in one day, with heat back on by evening.
Updated September 2026
When replacement makes more sense than repair
A furnace past about 15 years that needs a major part, one with a cracked heat exchanger, or one whose repairs are stacking up every winter is usually worth replacing. So is an old 80 percent furnace in a house that runs the heat eight months a year, where a 95 percent model cuts gas use noticeably.
We size from a load calculation because many older furnaces were oversized, which makes them short cycle, run loud and wear out faster. A right-sized, two-stage or variable-speed furnace runs longer at lower output, which keeps rooms more even and quieter.
What drives furnace replacement cost
Planning range: Local Spokane operators have advertised new furnaces around $4,199 to $6,799 installed and furnace plus AC packages around $8,199 to $10,999. These are published market figures from 2026-06, given for planning, with the on-site estimate as the real price.
What every furnace replacement includes
Furnace replacement options
High-efficiency gas furnace upgrade
Condensing gas furnaces rated 95 percent AFUE or higher capture heat from the exhaust and vent through plastic pipes to the side of the house. Upgrading from an 80 percent furnace means new venting, a condensate drain and, in many houses, a lined or capped chimney. We route the pipes so they exit above the expected snow line and away from windows, and install a condensate pump where there is no floor drain nearby. Avista has offered a rebate on qualifying high-efficiency gas furnaces.
Electric furnace replacement
Some Spokane homes without gas run electric furnaces. Replacing one like-for-like is straightforward, but it is also the moment to consider a heat pump, which can deliver the same heat for a fraction of the electricity on most winter days, with the electric furnace kept as backup for the coldest nights. We quote both so you can compare the upfront cost against operating cost, and we check whether the electrical panel has the capacity for either option before you decide.
Two-stage and variable-speed furnaces
Single-stage furnaces run at full blast every time they start. Two-stage furnaces run on a lower setting most of the time and step up only on the coldest days, and variable-speed blowers adjust airflow in small increments. The result is more even temperatures, less noise at the registers and better filtration because air moves through the filter longer. They cost more up front, and in a heating-heavy climate like this one the comfort difference is easy to notice.
Furnace types compared
| 80% single-stage | 95% two-stage | 95%+ variable-speed | |
|---|---|---|---|
| Gas use | Highest | Lower | Lowest |
| Comfort | Temperature swings | More even | Most even |
| Noise | Loudest | Quieter | Quietest |
| Venting | Chimney | Plastic sidewall | Plastic sidewall |
| Upfront cost | Lowest | Middle | Highest |
What furnace replacement costs around Spokane
Cost data tracked on Spokane furnace projects puts the furnace unit for a typical 80,000 BTU home at roughly $650 to $1,500, with installation labor of about $1,800 to $4,000. Most of the spread comes from venting, ductwork changes and efficiency level rather than the equipment itself, which is why we quote from what we see in the basement rather than from a price list.
How a furnace replacement day goes
- 1
Load calculation
The house measured and the size chosen.
- 2
Written quote
Options and prices side by side.
- 3
Permit
Mechanical permit filed.
- 4
Remove the old unit
Gas, power and venting disconnected safely.
- 5
Set the new furnace
Plenums, venting and drain connected.
- 6
Gas and combustion
Pressure set, combustion tested.
- 7
Start-up
Airflow checked, thermostat set, inspection booked.
Furnace replacement questions
How long does a furnace replacement take?
Most are done in one day, with heat back on by evening.
What size furnace do I need?
It depends on the house, not the old unit's size. We run a load calculation.
Should I replace my AC at the same time?
If the AC is over 12 years old, doing both together saves labor and matches the equipment.
Is a permit required for a furnace swap?
Yes. Washington requires a mechanical permit even for like-for-like replacements.
How much is a replacement furnace in Spokane?
Local project data and advertised prices put most installed furnaces in the low-to-mid thousands; your quote depends on efficiency, venting and ductwork.
Other furnaces, boilers & electric heat services we handle
Electric Baseboard and Wall Heater Repair
Answered 24/7, parts on the truck.
Electric Baseboard and Wall Heater Repair detailsBoiler Repair
Answered 24/7, parts on the truck.
Boiler Repair in SpokaneBoiler Replacement
Sized, quoted and permitted.
How we handle boiler replacementReady for a furnace that fits the house?
Call about furnace replacement in Spokane, WA.
