Understanding The Difference Between Condensing And Non-Condensing Furnaces

High Efficiency Furnace Shop Authentic, Save 67 jlcatj.gob.mx
High Efficiency Furnace Shop Authentic, Save 67 jlcatj.gob.mx from www.jlcatj.gob.mx


Furnaces are essential for keeping our homes warm during the colder months. When it comes to choosing a furnace, it’s crucial to understand the difference between condensing and non-condensing options. In this article, we will dive deeper into the workings of these two types of furnaces and help you make an informed decision for your home.

What is a Condensing Furnace?

A condensing furnace is a high-efficiency furnace that extracts more heat from the fuel it consumes. Unlike non-condensing furnaces, which vent the combustion gases directly into the atmosphere, condensing furnaces utilize a secondary heat exchanger to extract additional heat from the flue gases.

Advantages of Condensing Furnaces

Condensing furnaces offer several advantages over non-condensing ones. Firstly, they have a higher energy efficiency rating, typically around 90-98%, which translates to lower energy bills. Additionally, condensing furnaces produce less greenhouse gas emissions, making them more environmentally friendly.

Considerations for Condensing Furnaces

While condensing furnaces are highly efficient, they may require specific installation requirements. These furnaces produce condensate, which needs to be drained properly. Therefore, your home should have a suitable drainage system in place. Additionally, condensing furnaces are more complex and may require regular maintenance to ensure optimal performance.

What is a Non-Condensing Furnace?

Non-condensing furnaces, also known as conventional furnaces, have been in use for many years. These furnaces operate by burning fuel, such as natural gas or oil, to produce heat. The combustion gases are then vented out through a flue or chimney.

Advantages of Non-Condensing Furnaces

Non-condensing furnaces are relatively simpler and less expensive compared to condensing furnaces. They are also suitable for homes without a drain system for condensate disposal. If you live in an area with mild winters, a non-condensing furnace may provide sufficient warmth without the need for additional efficiency.

Considerations for Non-Condensing Furnaces

Non-condensing furnaces have lower energy efficiency ratings compared to condensing furnaces, typically ranging from 78-84%. This means they may consume more fuel and result in higher energy bills. Additionally, they produce more greenhouse gas emissions, contributing to environmental pollution.


When choosing between a condensing and non-condensing furnace, consider factors such as energy efficiency, environmental impact, installation requirements, and budget. Condensing furnaces offer higher efficiency and lower emissions but require proper drainage systems and regular maintenance. Non-condensing furnaces are simpler and less expensive, making them suitable for mild climates or homes without a drain system. Ultimately, the choice depends on your specific needs and preferences.


This article is for informational purposes only and should not be considered as professional advice. Always consult a qualified HVAC technician or specialist before making any decisions regarding your furnace.