Home upgrades aren't only about new smart devices that are all connected to your mobile phone, but about appliances that are connected to all your home and which can significantly improve your daily life. One of the best improvements you can make is installing a furnace. But how long does it take to install a new furnace? Well, since there are some variables in the formula, we will explore all of them so you can have a clear answer.
Before the Installation
As always, you can’t just install a furnace without some preparations. And the effort and attention you pay at that step influence furnace installation time. Many of these steps help avoid problems later on, especially if you're dealing with an older system or making major updates.
Problems Associated With Improper Sizing
Getting the right size furnace is critical. If the furnace is too big, it’ll cycle on and off frequently. This is a straight path to the energy waste and regular break downs. At the same time, a too small system will overwork itself trying to heat your space. Sizing issues can dramatically impact not only efficiency but also how long it takes to install a new furnace, as changes to your ductwork or layout might be required.
Your Ductwork & Air Vent Condition Should Be Professionally Inspected
Your HVAC contractor should inspect your existing ductwork for damage, leaks, and poor design. Inefficient or leaky ducts reduce performance and can complicate the installation process. If repairs or replacements are necessary, they’ll add time to your project—and rightly so, as your furnace relies on your ducts to properly distribute warm air.
You Should Invest in a Programmable Thermostat
A programmable thermostat is a great way to save some money and make your furnace work according to your schedule. Moreover, modern furnaces usually have a smart home integration, so you can use remote control and adjust your system for better energy-efficiency.
HVAC Ductwork, Gas Lines, A/C, and Electrical Work
Ok, preparation is finished, so how long does it take to install a new furnace? If you have a system already it will longer the process significantly. An old system usually means outdated ducts, electrical wiring, and gas lines. All of these will require time for upgrades before a new furnace could be installed.
Also, installation of a gas furnace is subject to an inspection. This ensures safety and compliance with local codes. If your lines need an extension or rerouting, it will take time. Similarly, if your furnace will connect to an air conditioning unit, you may need refrigerant line or coil modifications, which also affect furnace installation time.
During the Installation
On the big day, professional installers arrive prepared with all the necessary tools and components. In general, the process takes 4 to 10 hours, depending on complexity. For most average-sized homes with compatible systems, the process can be completed in a single day. However, multi-day installations are not uncommon for older homes or complicated system layouts.
Tasks include:
- Removing the old furnace (if applicable)
- Positioning the new unit
- Connecting ductwork, gas lines, and wiring
- Testing airflow and burner function
- Setting up the thermostat
- Ensuring system performance meets safety standards
After Installation Day
Your new furnace is up and running—but the job isn't quite finished yet.
So How Long Does It Really Take?
To sum it up:
- Simple replacement with no modifications: 4–8 hours
- Furnace with ductwork changes or new wiring: 1–2 days
- Major infrastructure updates: up to 3 days
Have we answered the question “how long does it take to install a gas furnace or electric furnace?” Of course, you should keep in mind that installation of gas models requires more time due to safety checks and permitting. And all in all, every preparation step longer the installation proccess. But usually, a furnace installation time is less than one day: between 6 to 12 hours total.
Should I Handle the Furnace Installation Process Myself?
In a word: no.
Furnace installation requires specialized skills, certifications, and permits—especially when dealing with gas lines and electrical wiring. DIY work not only risks your health and safety but may also void your manufacturer’s warranty.
Instead, trust a licensed professional like Fuse Service, recognized for offering the best in home service solutions. They ensure your system is installed efficiently and safely while following all local codes and regulations.
Conclusion
Finally, how long does it take to install a new furnace? There are some factors that can shorten or longer the time required for an installation. First thing you can do is hire a professional, who will help you choose the right size of your furnace and make all necessary upgrades of your home infrastructure. And Fuse Service is right who you need for that! Our team has ages of experience in quick furnace installations. Dial our number (669) 666-9219 or email support@fuseservice.com to hire the best specialist in California. Don’t forget to follow us on Instagram, Facebook, YouTube and TikTok to see how furnace installation can change your life.