How Long Does It Take to Install a Furnace?

Whether you’re looking to replace your furnace due to an unexpected breakdown or as a preemptive measure, there’s a lot that goes into the process. After choosing the right system, finding a dependable HVAC contractor, and scheduling the installation, many homeowners wonder: how long does it take to install a furnace? HVAC.com answers that question and discusses the factors that influence the timeframe for installing a new furnace so you'll be ready when the big day arrives.

How Long Does Furnace Installation Take?

The time required for installing a new furnace varies based on factors related to your home, the type of system you install, and whether the existing ductwork needs replacement. On average, the complete furnace installation process takes about 4-8 hours.

Allocate a full day to the installation to ensure you’re home when the HVAC dealer arrives and available to answer any questions they may have.

Furnace installation generally includes three main phases: a pre-installation assessment, the installation itself, and a final system testing and commissioning phase to ensure optimal performance and efficiency.

Factors that Influence Furnace Installation Time

1. Ductwork Considerations. The condition of your air ducts can greatly impact how long it takes to install a new furnace. Ducts typically last 10-25 years and often need to be replaced when installing a new HVAC system due to old age, damage, or incompatibility. Installing new ductwork usually takes 1-4 days, depending on your home’s size and layout.
2. The Size of Your Home. Speaking of a home’s size, homes with more square footage require furnaces with a larger heating capacity than smaller homes. Larger furnaces can increase installation time due to the need for additional modifications and necessary adjustments to account for increased airflow.
3. Gas or Electric Furnace. Installing a gas furnace is generally more complex than an electric one due to the need for venting and gas line connections, which can lengthen installation time. Meanwhile, electric furnaces usually require only an electrical connection, which simplifies and speeds up the installation. Switching from an electric furnace to a gas unit will also increase installation time because a dedicated gas line will need to be hooked up to the furnace.
4. Location. Where your furnace is located in your home can also affect the time required to install it. Accessible areas allow for quicker installations, while difficult-to-reach spots or those with obstacles can extend the process.
5. Furnace Speed. Furnaces vary in speed, including single-stage, two-stage, and variable-speed models. Single-stage furnaces generally have a straightforward installation, whereas two-stage and variable-speed models may require more complex setup and adjustments, potentially increasing the installation time.
6. Technician’s Experience. An experienced HVAC technician can complete the installation more efficiently and accurately compared to someone less experienced. Choosing a skilled professional can help streamline the process.

How to Prepare for Furnace Installation

To ensure a smooth installation, clear the area around your current furnace and provide easy access for the technicians. Confirm that all necessary permits are obtained and that any required electrical or gas connections are in place.

Discuss any concerns or special requirements with your HVAC contractor beforehand to avoid delays. Proper preparation can help make the installation process quicker and more efficient.