Furnace installation
Furnace installation done to code, not to whatever fits the old hole
A furnace is a combustion appliance, so the details that matter are venting, combustion air and gas piping. Get those wrong and you create a carbon monoxide risk. Get them right and the unit runs safely for 20 years.
Straight answer
What does a new furnace cost, and what changes the price?
Most Phoenix-area furnace installations run $4,500 to $9,000 installed. Efficiency rating, the size your load calculation requires, whether the existing venting and gas line can be reused, and permit fees set where your job lands in that range.
The most common hidden cost is venting. Older Valley homes often have a flue sized for an 80 percent furnace; a modern high-efficiency condensing unit needs a different vent material and route. We inspect that before quoting so the number you approve is the number you pay.
What a proper furnace installation includes
- Heat load calculation so the unit matches your home rather than the size of the furnace being removed.
- Venting and combustion air evaluated and corrected to current code, with the correct material for the equipment type.
- Gas piping verified for size and pressure, with a leak test documented before the unit is fired.
- Duct static pressure check, because a new furnace on restrictive ducts will overheat and short-cycle.
- Combustion analysis at startup for temperature rise, CO and draft, with the readings left with you.
- Permit, inspection and warranty registration handled in your city and emailed to you.
Choosing equipment
Efficiency ratings explained without the sales spin
- 80 percent furnaces are the standard workhorse: simple, inexpensive, vented in metal pipe, and fine for a Valley winter.
- 90 percent and higher condensing furnaces capture more heat from the gas, but they vent in PVC and produce condensate that needs a drain.
- Variable-speed blowers cost more and deliver steadier temperatures and quieter operation, which matters most in homes with hot upstairs rooms.
- Two-stage gas valves run low most of the time and high only in a cold snap, which is a good fit for Arizona's mild winters.
Because your heating season is short, efficiency upgrades pay back more slowly here than in a cold climate. We show the honest math rather than pushing the top tier.
Comparing heat pumps too?
How it goes
Installation day
- Consultation and measurements. We inspect equipment, ducts, gas piping, venting and the electrical supply.
- Written options. Two or three furnaces with price, efficiency, warranty and expected performance explained.
- Permit and ordering. Filed with your city and equipment staged before the crew arrives.
- Removal and install. Old unit hauled away, new furnace set, venting and gas connections completed and tested.
- Startup and inspection. Combustion readings documented, thermostat set up with you, inspector met.
Financing is available on furnace installations, including promotional plans for qualified buyers. See financing options.
Questions
Furnace installation questions
Typically $4,500 to $9,000 installed. Efficiency, the tonnage your load calculation requires, whether the existing venting and gas line can be reused, and permit fees set the final number. Your proposal lists each component separately.
Most residential replacements finish in one day. New venting, gas piping changes or combustion air corrections can push it into a second day, and we tell you that before you approve the work.
Yes. A mechanical permit is required in Phoenix, Scottsdale and the surrounding cities. We pull it, schedule the inspection and meet the inspector, which protects your warranty and your insurance documentation.
If your air conditioner is also aging, a heat pump usually makes more sense in Arizona because it covers cooling and heating. If your AC is healthy and under ten years old, a furnace replacement alone is the better value. We price both so you can compare.
Get an itemized furnace proposal
Load-based sizing, code-correct venting, permits handled. No same-day-signature pressure.