When a furnace reaches the end of its life — or fails so completely that repair no longer makes sense — the replacement you choose will heat your home for the next 15 to 20 winters. Werth-Aire installs high-efficiency gas furnaces sized and matched to your Pittsburgh home, with the permits pulled and the startup testing done properly so the system performs the way its efficiency rating promises.
Too many furnaces in this region were oversized years ago, sized off square footage rather than an actual heat-loss calculation. An oversized furnace short-cycles, wears out early, and leaves rooms uneven. We start with an ACCA Manual J load calculation, select equipment with Manual S, and review your ductwork with Manual D so airflow actually matches the new unit. That is the difference between a furnace that just runs and one that heats comfortably and economically.
You get a written quote that spells out the equipment, efficiency rating, permit, labor, startup testing, old-unit disposal, and warranty. Financing is available on approved credit so a planned replacement does not have to wait for the coldest week of the year.
Need furnace installation in Pittsburgh?
Same-day appointments · honest flat-rate pricing
When furnace replacement is the smart call
- The furnace is 15+ years old and needs a major repair
- Repeated breakdowns or rising repair bills each winter
- A cracked heat exchanger or an unsafe combustion problem
- Rooms that never heat evenly no matter what you do
- Energy bills climbing as the system loses efficiency
- Parts for your model are discontinued or hard to source
What our furnace installation covers
Proper sizing
Manual J load calculation so the furnace matches your home instead of being oversized off square footage.
High-efficiency options
Single-stage, two-stage, and modulating furnaces with AFUE ratings that lower operating cost.
Permits & code
We pull the Pittsburgh mechanical permit and install to manufacturer and code requirements.
Documented startup
Combustion analysis, temperature-rise verification, and warranty registration before we leave.
Our process
In-home load calculation
We measure the home and run a Manual J heat-loss calculation so the new furnace is sized to Pittsburgh Climate Zone 5A — not oversized.
Equipment & ductwork match
We select the furnace with Manual S and review duct capacity with Manual D so airflow supports the new system.
Written proposal & financing
You receive an itemized quote covering equipment, efficiency, permit, labor, disposal, and warranty, with financing options on approved credit.
Permitted install & startup
We pull the Pittsburgh mechanical permit, install to manufacturer spec, complete startup testing, and document the warranty.
What a proper furnace installation includes — and what cheap bids skip
A real load calculation
A Manual J heat-loss calculation to size the furnace to your home — not a guess from square footage or a straight match to the old unit that was likely oversized to begin with.
Correct venting and combustion air
Proper flue sizing and, on high-efficiency units, the right PVC intake and exhaust with a condensate drain routed to code — not reused venting that was sized for a different furnace.
Gas, electrical, and safety
A correctly sized gas line and shutoff, a dedicated disconnect, and a new thermostat where needed, with combustion analysis and a gas-leak check at startup.
Permit, startup, and cleanup
A pulled Pittsburgh mechanical permit and inspection, documented combustion and temperature-rise testing, old-unit haul-away, and warranty registration — the parts a low bid quietly leaves out.
Why the right size beats the biggest brand
Most furnaces in this region were oversized years ago, sized off square footage rather than an actual heat-loss calculation. An oversized furnace short-cycles, wears out faster, and leaves rooms uneven. We run an ACCA Manual J load calculation, select the equipment with Manual S, and review your ductwork with Manual D so airflow supports the new system. That sizing work is what turns the efficiency rating on the box into real comfort and lower bills, and it is the single biggest predictor of how well a new furnace performs over its 15-to-20-year life. If you are weighing oil, our oil-to-gas conversion can factor in too.
What affects the cost
A furnace replacement quote is built from the equipment plus everything required to install it correctly. What changes the number:
- Furnace capacity (BTU) and efficiency rating (AFUE) selected for your home
- Condition of existing ductwork, gas line, venting, and electrical
- Whether the install includes new flue or condensate routing for a high-efficiency unit
- Permit fees, old-equipment disposal, and any accessories such as a new thermostat or filtration
Published Pittsburgh estimates place furnace replacement in the range of roughly $3,500–$5,800, and a complete furnace-and-AC replacement around $7,200–$12,000. These are planning ranges — your quote reflects the load calculation and your home.
| Stage type | How it runs | Best for |
|---|---|---|
| Single-stage | Full blast, on or off | Budget-focused replacement |
| Two-stage | High and low output | Better comfort and evenness |
| Modulating | Fine-tuned output | Premium comfort, lowest bills |
Why choose Werth-Aire for furnace installation
A furnace is a 15-to-20-year decision, and we treat it that way — sizing it to your home with a Manual J calculation, pulling the permit, and documenting the startup so the efficiency you pay for is the efficiency you actually get.
Serving Pittsburgh since 2015
11+ years keeping North Hills and Allegheny County homes comfortable through hard winters and humid summers.
4.9★ across 51 reviews
Local homeowners rate us for straight answers, clean work, and pricing with no surprises.
Licensed, insured & EPA-certified
EPA Section 608 technicians installing to ACCA Manual J/S/D standards, with the proper Pittsburgh permits pulled on every install.
Flat-rate pricing, 24/7 response
A written quote before we start, the diagnostic fee explained up front, and around-the-clock help when it can’t wait.
Furnace Installation across Pittsburgh & the North Hills
From our base on the Perry Highway corridor, we bring furnace installation to homes across Allegheny County and Western Pennsylvania. That includes Ross Township, McCandless, West View, Bellevue, Avalon, and Shaler Township, plus the South Hills, the river boroughs, and the wider metro. See every community on our HVAC service areas page, or call (831) 461-3437 to confirm we cover your street.
Related services
Related reading
- What a New Furnace Costs in Pittsburgh (2026 Guide) — Furnace replacement is a major purchase. Here are honest Pittsburgh cost ranges, what actually moves the price, and how to compare quotes line by line.
- Oil vs. Gas Heat: Real Cost Savings in Western PA — Still heating with oil in Western PA? Here is an honest look at how oil and natural gas compare on cost — and what a conversion involves.