Most homes in Roseville and Rocklin heat with a gas furnace, often in the attic or a hall closet, paired with a central air conditioner. Many of those furnaces went in when the neighborhoods were built, and a lot of them are now 15 to 25 years old. If yours is starting to fail, this guide covers what a new furnace costs in 2026, how sizing works, what permits apply and how to decide between gas and a heat pump.
Signs it is time to replace your furnace
- The furnace is over 15 to 20 years old and repairs are becoming regular.
- A cracked heat exchanger was found. This is a safety issue and usually means replacement.
- Heating bills keep rising while comfort gets worse.
- Some rooms are always cold, or the furnace runs in short bursts all day.
- Parts for your model are hard to find.
If the furnace is younger and the problem is a single part, a repair is usually the better choice. See our furnace repair in Roseville page.
What a new furnace costs in 2026
Fixr’s 2026 national cost guides give these ranges:
- Natural gas furnace, installed: about $3,800 to $10,000.
- Furnace replacement, most homes: about $2,800 to $7,500, with a national average around $4,800.
Replacing the furnace and air conditioner together usually runs about $11,000 to $15,000 in our area. Our new HVAC system cost guide breaks that down.
What moves the price:
- Efficiency. An 80% furnace vents through a metal flue. A 95% or higher furnace needs PVC venting and a condensate drain, which adds labor if the old setup does not have them.
- Location. Attic installs take more time than a garage or closet.
- Single-stage or variable speed. Two-stage and variable-speed furnaces cost more but run quieter and more evenly.
- Ductwork. Leaky or undersized ducts may need repair, and California rules can require duct testing when ducts are altered.
Sizing matters more than the brand
Many Roseville and Rocklin homes have furnaces that are larger than they need. An oversized furnace heats the house in short bursts, cycles on and off, wears out faster and leaves uneven temperatures. The right size comes from a load calculation that looks at square footage, insulation, windows and duct condition, not from matching the old unit’s label. We explain how this works in what size furnace do I need.
Permits and Title 24
A furnace replacement in Roseville or Rocklin needs a mechanical permit from the city building department. California’s Title 24 energy code sets the rules the new system has to meet, and the city inspects the finished work. A licensed contractor should pull the permit for you. Unpermitted work can cause problems later, for example when you sell the home.
Gas service in both cities comes from PG&E. If a new furnace needs a larger gas line or a new shutoff, that is part of the installation.
Gas furnace or heat pump
A heat pump replaces both the furnace and the air conditioner with one electric system. It works well in our mild winters and makes most sense when the AC also needs replacing. A gas furnace still makes sense if your AC is fairly new, if you prefer hotter supply air, or if electrical upgrades would be expensive. Our heat pump vs furnace comparison covers operating costs and trade-offs.
Roseville Electric has run heat pump rebate programs in the past that required a City permit and HERS duct testing. Programs change, so check roseville.ca.us before you buy. The federal tax credit for furnaces and heat pumps ended on December 31, 2025.
Questions to ask before you sign
- Did the contractor do a load calculation, or just match the old size?
- Is the permit included in the price?
- What does the quote include: venting, gas line work, condensate drain, thermostat, haul-away?
- What warranty comes with the equipment, and what with the labor?
- Does the quote list the exact model number, so you can compare offers fairly?
What installation day looks like
- We protect floors and the work area, shut off gas and power, and remove the old furnace.
- We set the new furnace, connect gas, venting, ductwork and the condensate drain if needed.
- We start the system, check gas pressure, temperature rise and airflow, and test safety controls.
- We show you the thermostat and filter, and schedule the city inspection.
We install furnaces in Roseville, Rocklin, Granite Bay, Lincoln and nearby cities. Learn more on our heating and furnace services page or request an estimate.
Frequently asked questions
How much does a new furnace cost in Roseville?
Fixr’s 2026 national guide puts a natural gas furnace installed at about $3,800 to $10,000, and furnace replacement at about $2,800 to $7,500 for most homes, with a national average around $4,800. Your price depends on size, efficiency, venting and any duct or electrical work.
Do I need a permit to replace a furnace in Roseville or Rocklin?
Yes. Replacing a furnace in California needs a mechanical permit from the city, and the job has to meet Title 24 energy rules. The installer should pull the permit and arrange the inspection.
Is there a federal tax credit for a new furnace in 2026?
No. The federal energy efficient home improvement credit ended for equipment placed in service after December 31, 2025. Check current utility and manufacturer offers instead.
Should I replace my furnace and AC at the same time?
If both are over about 15 years old, replacing them together usually costs less than two separate jobs and makes sure the indoor coil matches the new AC. A full furnace and AC system typically runs about $11,000 to $15,000 in our area.
How long does a furnace installation take?
A straight swap of a gas furnace usually takes one day. Jobs that move the furnace, change venting or add ductwork can take longer, plus time for the city inspection.