• Home
  • HVAC
  • How to Run Furnace off Generator

How to Run Furnace off Generator

How to Run Furnace off Generator

If you’re in need of running your furnace off a generator, you’ve come to the right place.

In this article, we’ll guide you through the process step by step, ensuring that you have a clear understanding of how to accomplish this task.

From choosing the appropriate generator size to connecting it to your furnace and operating it safely, we’ll cover all the necessary details.

So, let’s dive in and learn how to effectively run your furnace off a generator.

Key Takeaways

  • Choose a generator with sufficient wattage capacity for the furnace’s power requirements.
  • Use a transfer switch and consult a professional electrician to ensure safe and proper connection.
  • Regularly check fuel levels and store fresh fuel in a well-ventilated area.
  • Implement energy-saving measures and troubleshoot common furnace issues to optimize efficiency.

Choosing the Right Generator Size

When choosing the right generator size, it’s important to consider the power requirements of your furnace. Most furnaces require around 5,000 to 7,000 watts to operate. However, it’s crucial to check the manufacturer’s specifications to ensure accuracy.

A portable generator can be a reliable source of power during emergencies or off-grid situations. To determine the appropriate generator size, you need to know the power consumption of your furnace. Keep in mind that other appliances and devices may also need to be powered simultaneously, so it’s recommended to choose a generator with a slightly higher wattage capacity.

Connecting the Generator to the Furnace

To connect a generator to the furnace, you’ll need a transfer switch. This device allows you to safely and efficiently switch between the utility power and the generator power. Here are three important things to consider when connecting the generator to the furnace:

  • Proper grounding for generator connection:
  • Ensure that the generator is properly grounded to prevent electrical shocks and equipment damage.
  • Use a grounding rod to establish a direct connection between the generator and the earth.
  • Consult a professional electrician to ensure compliance with local electrical codes.
  • Maintaining generator fuel supply:
  • Regularly check the fuel level in the generator to ensure uninterrupted operation.
  • Use fresh fuel and store it in a safe, well-ventilated area away from heat sources.
  • Consider using fuel stabilizers to prevent fuel degradation during long periods of inactivity.

Operating the Furnace With the Generator

You’ll want to make sure you adjust the thermostat settings on your furnace before powering up the generator. This will prevent any sudden power surges or fluctuations that could damage your furnace. Once the generator is up and running, you can operate your furnace as you normally would. However, it’s important to keep in mind some troubleshooting tips and energy-saving measures to ensure the smooth operation of your furnace on a generator.

Troubleshooting Common Furnace Issues Energy-Saving Tips for Running Furnace on Generator
Check for blown fuses or tripped Use a programmable thermostat to optimize energy
circuit breakers. usage.
Clean or replace dirty air filters. Insulate your home properly to minimize heat loss.
Reset the furnace by turning off Close doors and windows to retain heat.
the power and turning it back on. Set the furnace fan to "auto" mode.
Ensure the gas supply is on and Avoid setting the thermostat too high.
the pilot light is lit. Use space heaters in occupied rooms.

Following these tips will help you troubleshoot common furnace issues and conserve energy while running your furnace on a generator.

Safety Tips for Running Furnace off Generator

For safety reasons, it’s important to regularly check the gas supply and ensure that the pilot light on your furnace is always lit.

When running your furnace off a portable generator during a power outage, there are a few key safety tips to keep in mind:

  • Make sure to choose a generator that is suitable for powering your furnace. Check the wattage requirements of your furnace and select a generator that can handle that load.
  • Use a transfer switch to connect your generator to your furnace. This will prevent backfeeding of electricity into the utility lines, which can be dangerous for utility workers.
  • Keep your generator outside and away from windows, doors, and vents. Generators produce carbon monoxide, which can be deadly if inhaled.

Following these safety tips will help ensure that you can run your furnace safely and efficiently during a power outage.

Frequently Asked Questions

How Long Can I Run My Furnace off a Generator Without Damaging It?

You can run your furnace off a generator without damaging it, but it’s important to consider a few things. During winter, ensure your generator is properly maintained and has enough capacity to handle the furnace’s power requirements.

Can I Connect Multiple Furnaces to a Single Generator?

To run multiple furnaces off a single generator, you need to ensure that the generator has enough capacity to handle the combined power requirements of all the furnaces. Make sure to calculate the total wattage needed.

What Type of Fuel Should I Use in My Generator to Run the Furnace?

To run your furnace off a generator, use a fuel that ensures fuel efficiency and has a minimal environmental impact. Consider using propane or natural gas, as they are clean-burning and can provide reliable power for your furnace.

Can I Use a Portable Generator to Run a Central Heating System?

To connect a portable generator to your central heating system, ensure it has the capacity to handle the furnace’s power requirements. Take precautions by using transfer switches and surge protectors to avoid damage and ensure safe operation.

Is It Safe to Run My Furnace off a Generator During a Power Outage?

When running your furnace off a generator during a power outage, it’s important to prioritize generator safety. Ensure proper ventilation and follow manufacturer guidelines. Consider alternative heating methods to supplement your furnace.


To conclude, running your furnace off a generator can be a practical solution during power outages. By choosing the right generator size and properly connecting it to your furnace, you can ensure a seamless operation.

Following safety tips, such as keeping the generator in a well-ventilated area and using proper extension cords, is crucial to prevent any accidents.

With these steps in mind, you can confidently rely on your generator to keep your furnace running efficiently and your home warm and comfortable.

Popular Posts