How Long Does It Take to Install a New Furnace? A Complete Homeowner’s Guide

Installing a new furnace is one of the most important upgrades you can make to your home especially when winter temperatures begin to drop. If your current system is inefficient, outdated, or simply not working, a replacement can provide better comfort, improved air quality, and reduced energy bills.

But one common question homeowners ask is: How long does furnace installation actually take?
The short answer? It depends. The full answer? Let’s break it down.

Average Time for Furnace Installation

On average, a standard residential furnace installation takes between 4 to 10 hours. Most replacements are completed in a single day, though more complex jobs might extend into the second day.

Factors that influence the installation time include:

  • Type of furnace (gas, electric, or oil)
  • Size and layout of your home
  • Whether ductwork modifications are required
  • Accessibility of the installation area
  • Whether it's a replacement or a brand-new installation

Let’s look deeper into what affects this timeline.

1. Type of Furnace Being Installed

The kind of furnace you're installing has a direct impact on how long the process takes.

  • Gas Furnaces (most common): Usually 6-8 hours for replacement.
  • Electric Furnaces: Tend to be simpler and may only take 4-6 hours.
  • Oil Furnaces: These can be more complex and may take a full day or longer, especially if oil tanks or lines need to be replaced or installed.

2. New Installation vs. Replacement

If you’re replacing an old unit with a new one of the same type, the process is faster and more straightforward. The technician will:

  • Disconnect and remove the old unit
  • Connect the new furnace to the existing ductwork and gas/electric lines
  • Perform testing and calibration

However, installing a furnace in a home that’s never had one before is more time-intensive. It may involve:

  • Cutting and installing ductwork
  • Running electrical or gas lines
  • Installing vents or flues

This can easily extend the job by an additional day or more.

3. Condition of Existing Ductwork

Ductwork plays a critical role in your heating system. If your ducts are in good shape, they can be reused, saving time. But if the ducts are damaged, outdated, or incompatible with your new furnace, they may need to be repaired or replaced, which adds time (and cost) to the project.

Additionally, zoning systems, insulation, or airflow adjustments may be recommended during installation, depending on your home’s layout.

4. Permits and Inspections

Depending on local building codes in your area, certain permits or inspections may be required for furnace installation. Your contractor typically handles these steps, but they can cause minor delays.

For example, in Aurora, proper HVAC permitting ensures the installation meets safety standards. This helps protect your home and ensures the warranty on your new system remains valid.

5. Accessibility of the Furnace Location

Is your furnace in an easy-to-access basement or a tight crawl space? The more difficult the location is to work in, the longer the installation will take. Installers need room to maneuver and connect components safely and properly.

6. Testing and Safety Checks

Once the furnace is in place, installers don’t just pack up and leave. They’ll:

  • Test the system to ensure it's operating efficiently
  • Check for gas leaks (in gas units)
  • Inspect airflow and thermostat function
  • Calibrate the system for optimal performance

This final phase takes 1-2 hours and ensures your system is safe, efficient, and ready to heat your home. 

What Can You Do to Speed Up the Process?

While you won’t be doing any of the heavy lifting, there are a few things homeowners can do to make the process smoother:

  • Clear the work area around the furnace before the technicians arrive.
  • Ask questions ahead of time know what type of system you’re getting and what it involves.
  • Choose a reliable local contractor who’s experienced and transparent about time estimates.

If you are considering a trusted furnace installation service in Aurora, it's important to work with certified professionals who can handle both straightforward and complex installations without unnecessary delays.

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