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Black Lotus HVAC + Electrical (206) 200-9134
Service · High-efficiency furnace installation in Seattle

High-efficiency furnace installation in Seattle.

A modern 96% AFUE gas furnace install in Seattle typically costs $8,500 to $13,000 for a complete equipment + install package, including the new furnace, gas line work, venting modifications, permit, removal of the old unit, and a combustion analysis on startup. Most installs complete in 1 to 2 days. We also model heat pump alternatives in every quote so you can compare 10-year operating costs side by side before deciding.

Call (206) 200-9134 → Get a free quote
// 96% AFUE TRANE S9V2 80,000 BTU · BELLEVUE INSTALL
Typical net cost $8,500 – $13,000
AFUE rating 96%+ standard
Install time 1 – 2 days
Parts warranty 10 yrs
Lifespan 15 – 20 yrs
What drives the price

AFUE rating, tonnage, venting, and gas line scope.

  1. 01

    AFUE rating

    80% AFUE base spec vs 95-97% high-efficiency. HE takes ~$1,200 more up front, ~$300/yr off the bill.

  2. 02

    Tonnage

    Sized from a Manual J load calc. Oversized furnaces short-cycle and die early.

  3. 03

    Venting

    95%+ AFUE units vent in PVC through a sidewall. Older B-vent retrofits add labor.

  4. 04

    Gas line + electrical

    Existing capacity vs adding a new run. Most retrofits reuse the existing.

We give every estimate in writing within 24 to 48 hours. Heat pump alternative modeled on every quote so you see both numbers before deciding.

What a modern furnace install looks like

A high-efficiency gas furnace install in Seattleis two days, one permit, one combustion analysis.

A high-efficiency furnace replacement is two days for most Seattle homes: day one is removal of the old unit, gas line and vent rework, and rough-in of the new cabinet. Day two is electrical, controls, startup, and the combustion analysis we run on every install.

96%+ AFUE means 96 cents of every dollar of gas burned becomes heat in the home. Compared to a typical 1990s 80% AFUE furnace, the high-efficiency unit saves roughly $300/year on a Seattle gas bill and qualifies for a longer manufacturer warranty.

We don't push you off gas if your home doesn't pencil for a heat pump. We just put both numbers in front of you, the gas furnace install AND the heat pump alternative with the PSE rebate and federal credit applied. Your call.

Get your high-efficiency furnace install quote in 24 to 48 hours.

Free on-site evaluation. Master electrician on every consult. No high-pressure sales. We answer Mon-Sun, 7 AM to 8 PM.

Request a quote → Call (206) 200-9134
Gas furnace vs heat pump

Gas furnace vs heat pump for your specific home.

Most homeowners benefit from seeing both options modeled before they commit. Here is the honest side-by-side for a typical 2,200 sq ft Seattle home.

Factor96% AFUE gas furnaceCold-climate heat pump
Up-front cost$8,500 – $13,000$12,800 – $24,500 net
Adds cooling?NoYes (one unit)
Annual operating$1,100 – $1,400$700 – $900
RebatesNone$1,200 PSE + $2,000 IRA
Best fitFurnace under 8 yrs old, no AC need, K&T wiringReplacing 15+ yr furnace, want AC, electrification path

Gas furnace still wins for some Seattle homes. See the heat pump option if your furnace is 15+ years old and you'd benefit from cooling.

Cost breakdown

Cost breakdown by furnace size.

System size is calculated from a Manual J load calculation, not from square footage estimates. Undersized furnaces run constantly and never reach setpoint on the coldest nights; oversized furnaces short-cycle, wear out faster, and create uneven room temperatures.

✓Free on-site Manual J✓Written quote in 24–48 hours✓Combustion analysis included
Get a real quote → Call (206) 200-9134
Furnace size
Typical home
60,000 BTU (small) 1,000–1,500 sq ft, well-insulated
$8,500–$10,500
80,000 BTU (medium) 1,500–2,200 sq ft, average
$9,200–$11,500
100,000 BTU (large) 2,200–3,000 sq ft, older insulation
$10,500–$13,000
120,000 BTU (extra large) 3,000+ sq ft
$11,800–$14,500
Add-on · Gas line repair / extension If existing line is undersized or damaged
+$400–$1,200
Add-on · Ductwork modifications If existing returns undersized
+$600–$2,800
Add-on · Smart thermostat Ecobee or Nest
+$250–$450

Heat pump alternative is modeled on every furnace quote so you see both 10-year operating costs side by side before committing.

From first call to final walkthrough

How a high-efficiency furnace install with us goes.

Our process is built around making decisions easy, not pressuring you to make them today. Here's what every Black Lotus install looks like.

See the full process →
  1. 01

    Day 0Schedule.

    You call. We answer. A technician is introduced by name and a two-hour window is confirmed.

  2. 02

    Day 1Consult.

    On-site evaluation, Manual J load calc where applicable, panel + ductwork check, install photos. Written estimate in 24 to 48 hours.

  3. 03

    Day 2-4Approve.

    You pick your option. We pull permits, register warranties, lock in your install date and PSE rebate paperwork.

  4. 04

    Day 5-7Install.

    Full walkthrough before we touch a wire. Combustion analysis if any gas equipment remains, startup, full system test.

  5. 05

    AfterSatisfied.

    Walkthrough at the end. Anything you flag, we fix. Final payment only after sign-off. Warranty starts now.

Equipment lines we install

The systems we install (and why).

We install three primary lines based on what fits your home, your budget, and your warranty preference. All are AHRI-certified, all carry full manufacturer warranties.

Trane S9V2
Premium
Efficiency 96% AFUE

Variable-speed blower, 20-year heat exchanger warranty. Premium gas furnace tier. Best for homes that want the quietest cabinet and the longest warranty.

AFUE 96%
Heat exchanger 20 yrs
Blower Variable-speed
Lennox SLP99V
Premium+
Efficiency 99% AFUE

Highest efficiency gas furnace on the US market. Variable-capacity modulation. For homeowners who want the absolute lowest gas bill.

AFUE 99%
Modulation Variable-capacity
Warranty 10 yrs parts
Goodman GMVC96
Value
Efficiency 96% AFUE

Two-stage, 10-year parts warranty. Strong value option for homes with longer-term replacement plans where premium tier ROI doesn't pencil.

AFUE 96%
Stages 2-stage
Warranty 10 yrs parts
Why homeowners pick us

Three operational choices that change how the install lands.

Real Manual J load calculations.

We don't quote from square footage. Every system is sized from a measured load calculation accounting for insulation, windows, orientation, and air sealing. Oversized equipment is the most common failure mode we see on competitor installs.

In-house electrical.

HVAC and electrical under one roof. No subcontractor coordination, no second permit, no surprise add-ons after the gas guy leaves. If your panel needs work, we do it with the same crew on the same week.

Final payment after walkthrough.

You sign off after we walk the install with you. Anything you flag, we fix. Your money clears only after you say it's right. That clause is in writing on every install.

"

Black Lotus might not currently have the marketing chops of the bigger outfits, it's worth giving them a meeting. We're glad we did. They charged us 1/2 of other bids I had gotten.

Anna Chen · Local Guide · 132 reviews · Verified Google review

Common scenarios

A few common scenarios we see in Seattle.

Replacing a 1990s 80% AFUE furnace.

The most common Seattle gas furnace replacement. ~$300/year savings on the bill plus 10 to 15 more years of reliable heat.

When to replace your furnace →

Heat pump alternative declined.

For homeowners who priced both and chose to stay on gas. We model the heat pump quote side-by-side with the new furnace, then install whichever you pick.

See the heat pump option →

New construction or addition.

High-efficiency gas furnaces for new builds where the gas line is already in. We size from a Manual J load calc, not square footage.

Common questions before you call

Quick answers before you call.

01 /

How long does a furnace installation take?

+
Most furnace installs are 1 to 2 days. Day 1 is removal + rough-in. Day 2 is venting, electrical, controls, startup, and combustion analysis.
02 /

What is AFUE and why does it matter?

+
Annual Fuel Utilization Efficiency. 80% AFUE means 80 cents per dollar of gas becomes heat; 96% AFUE means 96 cents. The high-efficiency unit pays back the $1,200 upgrade in about 4 years on a typical Seattle bill.
03 /

Do you handle gas line work?

+
Yes. Most retrofits reuse the existing gas line. Older 1990s installs sometimes need an extension or upsize, which we quote upfront.
04 /

What permits do you pull?

+
Mechanical permit for the furnace itself; electrical permit if we add a new circuit. We pull, schedule the inspection, and pass on the first round.
05 /

Do you offer financing?

+
0% APR for 12 to 24 months for qualified buyers. We share the options at consult.
06 /

Should I switch to a heat pump instead?

+
For 75% of Seattle homes facing furnace replacement, yes. We model both on every quote so you can decide with the real numbers. The other 25% (newer furnace, no AC need, K&T wiring) we still install gas honestly.
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Schedule your consult

Free on-site evaluation. Written quote in 24 to 48 hours.

Same-day diagnostic for furnace, AC, or electrical service calls within our primary area. King, Pierce, and Snohomish counties.

Call (206) 200-9134 → Schedule online
Hours Mon-Sun · 7 AM – 8 PM
Service area King · Pierce · Snohomish
Email blacklotushvac@icloud.com

Three Seattle-born partners. 30+ years combined HVAC experience. Master electrician on every consult. PSE Trade Ally with the $1,200 rebate priced into your quote.

Call (206) 200-9134 · Free quote