Furnace Installation Across Puget Sound

A furnace is still the workhorse of home heating in Western Washington, and when the old one fails in January you need a replacement that is sized correctly, installed to code, and running the day it goes in. Rushing that decision is how homeowners end up with an oversized unit that short cycles or an undersized one that never keeps up on the coldest mornings.

Most furnace replacements we do in Puget Sound are gas, but the conversation now almost always includes whether a heat pump belongs in the plan. We will lay out both paths honestly, because a gas furnace is the right answer for some homes and the wrong one for others, and the rebate money that favors heat pumps is real. This page covers what the install includes, what it costs, and how to decide.

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What a furnace installation includes

We size the furnace to a load calculation based on your home's envelope, not the capacity of whatever was there before. Old furnaces were routinely oversized, so matching the old BTU rating usually repeats a mistake. Correct sizing gives you steadier temperatures, quieter operation, and a longer equipment life.

The install covers removing the old unit, setting the new furnace, connecting gas and venting or electrical, tying into existing ductwork, wiring the thermostat, and verifying combustion and airflow before we leave.

Load calculation and correct BTU sizing for your home
Removal and disposal of the old furnace
Gas line and venting connection, or electric hookup for electric furnaces
Ductwork transition, plenum, and filter housing as needed
Thermostat wiring and configuration
Combustion analysis and airflow verification at startup

When to replace rather than repair

A furnace past 15 years that needs an expensive repair is usually a replacement candidate, especially if efficiency has dropped and parts are getting scarce. Safety issues like a cracked heat exchanger are a hard stop: that furnace gets replaced, not patched.

If you are replacing anyway, that is the moment to price a heat pump alongside the furnace, because the incremental cost often unlocks cooling and rebates you would otherwise leave on the table.

Signs to watch for

The furnace is 15 or more years old and needs a costly repair
A cracked or failing heat exchanger has been found
Uneven heating, cold rooms, or the furnace never keeping up in a cold snap
Rising gas or electric bills as efficiency degrades
Frequent short cycling or repeated ignition failures
Parts for the model are discontinued or hard to source

What furnace installation costs and what drives it

Furnace installation in Puget Sound generally runs from the low to mid four figures for a standard gas replacement, with high-efficiency and variable-speed models costing more. Electric furnaces and complex duct modifications move the number. We quote the installed price, not a stripped equipment-only figure.

Efficiency tier matters both for the sticker and the bill. A high-efficiency condensing furnace costs more up front and needs its own venting and condensate drain, but it can pay back over time depending on how you heat.

What drives the range

Gas versus electric and the efficiency tier of the unit
Single-stage, two-stage, or variable-speed blower
Venting changes required for a condensing high-efficiency furnace
Ductwork, plenum, or filter-housing modifications
Access and location of the furnace, such as tight attic or crawlspace installs

Permits and incentives

Furnace installation requires a mechanical permit in every Washington jurisdiction, and we pull it and schedule the inspection as part of the job. Gas appliance work in some areas also triggers notification to the Puget Sound Clean Air Agency, which we handle where it applies.

Straight gas-furnace replacements rarely qualify for the big utility rebates that heat pumps do. If lowering your net cost with rebate money matters, that is another reason to have us price a heat pump alongside the furnace before you decide. We will show both numbers so the tradeoff is clear.

See current utility rebates

How the install works

1
Same-day estimate
We inspect the existing system, run the load calculation, and give you a written estimate the same day with the furnace and, where relevant, a heat pump option side by side.
2
Permitting
We file the mechanical permit with your jurisdiction and handle any air-agency notification required for gas appliance work.
3
Removal and installation
We remove the old furnace, set the new one, connect gas or electric and venting, tie into the ductwork, and wire the thermostat.
4
Startup and verification
We run a combustion analysis on gas units, verify airflow and temperature rise, and confirm the system holds setpoint before we leave.
5
Walkthrough and inspection
We walk you through the controls and filter, register the warranty, and meet the inspector to close out the permit.

New furnaces carry the manufacturer parts warranty, commonly 10 years on registered equipment including the heat exchanger, and we register the unit for you. Our installation workmanship is warranted separately, and verified combustion and airflow at startup are what protect the equipment warranty.

Brands we work on

Lennox
Carrier
Day & Night
Trane
Bosch
Ameristar

Furnace Installation questions, answered

How long does a furnace installation take?

A straightforward like-for-like gas furnace replacement is usually a one-day job. High-efficiency conversions that require new venting and a condensate drain, or installs with duct modifications, can run longer. We give you a realistic timeline in the written estimate.

Should I install a furnace or a heat pump?

If you heat with gas and do not want cooling, a furnace may be the simpler choice. But because adding a heat pump often unlocks rebates and summer cooling for a modest incremental cost, we price both and show you the net numbers so you can choose with full information.

What size furnace does my home need?

The right size comes from a load calculation based on your home's insulation, windows, and layout, not from matching the old unit's BTU rating. Old furnaces were often oversized, and copying that number leads to short cycling and uneven heat.

Is a high-efficiency furnace worth it?

It depends on how much you run the furnace and your fuel rates. High-efficiency condensing units cost more and need dedicated venting, but they can reduce gas use meaningfully in homes that heat heavily. We will show the payback for your situation.

Do you pull the permit?

Yes. Every furnace install we do is permitted and inspected. Unpermitted mechanical work can cause problems at resale and voids the protection an inspection provides, so we never skip it.

Related services

We serve homeowners across eight Puget Sound counties, Everett to Puyallup. See our full service area.

Authorized dealer for all major brands

We repair all major brands, whether or not we installed the system.

Same-day service

Need furnace installation? Start today.

Call between 7 AM and 10 PM, any day of the week, and you talk to us, not an answering service. Same-day estimates, upfront ranges, and financing available.

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