What is the life expectancy of a gas furnace?

Posted on February 4, 2025

If you have an older gas furnace, you may be starting to wonder, how long does a furnace typically last? When is the best time to replace it?

On average, a well-maintained gas furnace can last between 15 to 30 years, but its lifespan depends on several important factors. Understanding these factors can help you get the most out of your investment and maintain reliable heating for years to come.

Factors Affecting Gas Furnace Longevity

1. Quality of Installation

A furnace that’s improperly installed may face operational issues from the start. Professional installation by licensed HVAC experts ensures that your furnace functions efficiently and safely, extending its life. Here at Tedo Woods Heat & AC, our techs are meticulously trained to make sure your gas furnace is installed correctly and safely to ensure it lasts the longest lifespan possible.

2. Maintenance and Repairs

Routine maintenance, such as annual inspections and filter changes, plays a significant role in extending the life of your furnace. Regular tune-ups can identify minor issues before they become costly problems, keeping your system running at its best. Has it been a while since your last furnace tune-up? No worries, give us a call to schedule an appointment!

3. Air Filter Quality and Maintenance

Dirty or clogged air filters force the furnace to work harder, leading to wear and tear over time. Regularly replacing or cleaning your air filters improves efficiency and helps protect your system components.

4. Proper Sizing of the Furnace

An undersized furnace will struggle to heat your home adequately, while an oversized unit will short-cycle, turning on and off frequently. Both scenarios put unnecessary strain on the system, reducing its longevity. When we install a new heating system in your home, we make sure the size of the unit correctly corresponds to the size of your home.

5. Quality of the Furnace

Higher-quality furnaces with advanced features tend to last longer. Investing in a reputable brand and model can save you money on repairs and replacement costs over time.

What are some signs that your furnace needs a replacement?

• Rising energy bills despite regular maintenance
• Frequent breakdowns and costly repairs
• Uneven heating or inability to maintain a consistent temperature
• Unusual noises or odors coming from the furnace
• Rust or corrosion on the unit

While the typical gas furnace lasts between 15 to 30 years, taking steps to maintain it can significantly extend its life. If you’re noticing signs that your furnace is nearing the end of its lifespan or want to schedule a maintenance check, give us a call. We're here to help keep your home warm and comfortable throughout the seasons.