HVAC Install Hub · Contractor ReferralEst. MMXXVI
HVAC Install HubA Trade Catalog · Vol. I

Fall Furnace Replacement 2026

Furnace Installation & Replacement

September and October are the ideal months to replace a furnace — before heating-season demand fills every contractor schedule. Free, no-obligation quotes from local HVAC contractors.

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Why Fall Is the Right Time to Replace Your Furnace

September and October sit between peak cooling and peak heating seasons — the window when HVAC contractors are often less busy, and replacing a furnace on your own schedule leaves time to compare quotes and arrange the permit before the first serious cold snap, rather than taking whoever can come first after a breakdown in mid-winter.

If your furnace is over 15 years old, produces uneven heat, or has an AFUE rating below 80%, replacement is usually more cost-effective than continued repairs. AFUE is the share of the fuel that becomes heat: a 95 AFUE furnace turns about 95% of its fuel into heat against about 70% for an old 70 AFUE unit, so it burns roughly a quarter less fuel for the same heat.

We connect you with local HVAC contractors. Ask each one which brands and models they install, and whether the quote covers the full process from permit to final inspection.

What a Complete Furnace Installation Covers

Ask each contractor whether the quote includes:

  • Home assessment and heat load calculation
  • Safe removal and disposal of the old furnace
  • New furnace installation and gas line connection
  • Flue venting inspection or replacement
  • The permit and inspection, and who will pull the permit
  • System test, commissioning, and homeowner walk-through

For how a load calculation sets the size, and what to ask about it, see what size heat pump, AC or furnace do I need.

Furnace Installation Cost

It depends on the furnace's size and AFUE rating, venting and ductwork changes, local labor rates and the permit, so the reliable figure is a written quote for your home. Submit a free quote request to get started.

Comparing a new furnace with a heat pump? Our cost comparison by state shows what each delivered heat for in your state in 2024. To estimate a year of heating for your own home, try the heating cost calculator.

FAQ

Furnace Installation FAQ

Gas, electric, or oil furnace — which should I choose?
Gas furnaces are the most common and cost-effective to operate where natural gas is available. Electric furnaces have lower upfront costs but higher operating costs in most regions. Oil furnaces are found in older Northeast homes — replacement often means switching to gas or a heat pump. Ask each contractor to compare the options for your home's existing fuel source and local utility rates.
What AFUE rating should I look for in a new furnace?
AFUE (Annual Fuel Utilization Efficiency) measures how efficiently a furnace converts fuel to heat. The federal minimum is 80 AFUE. High-efficiency furnaces (95–98 AFUE) cost more upfront but significantly reduce gas bills, especially in cold climates. Many utilities offer rebates on 95+ AFUE models.
How long does furnace installation take?
It depends on the job. Swapping one furnace for a similar one is usually quicker than an installation that includes ductwork or a flue reline. Ask each contractor for the expected schedule in writing, including when the permit inspection will happen.
Do I need a permit for furnace installation?
Most US cities and counties require a permit to install or replace a furnace, but the rules and fees vary. Check with your local building department, and ask each contractor whether the quote includes the permit and who will pull it.
How much does furnace installation cost?
It depends on the furnace's capacity and efficiency (AFUE), any venting or ductwork changes, local labor rates and the permit, so the reliable figure is a written quote for your home. When you compare quotes, check that each one lists the equipment model numbers, the load calculation, the permit and removal of the old equipment.
How long do furnaces last?
Most furnaces last 15–25 years with regular maintenance. If your furnace is over 15 years old, frequently needs repairs, or has an AFUE below 80, replacement is often more cost-effective than continued repairs.
Guides

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What Size Heat Pump, AC or Furnace Do I Need?

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Cost Guide · September 2026

HVAC Installation Cost in 2026: What Homeowners Actually Pay

Per Angi data published by This Old House: central AC $4,000–$8,000, gas furnace $3,800–$10,000, heat pump $4,500–$8,000 installed. 2026 breakdown by system type, A2L refrigerant impact, and how to compare quotes.

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Furnace Guide · Updated October 2026

When to Replace Your Furnace: Timing, Warning Signs and Cost

Late summer through October is the strongest window to replace a furnace. The five signs it is due, what replacement costs in 2026, and whether a heat pump fits better.

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