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What is a furnace?

A furnace is a home heating product that delivers warm air throughout a home. In a central heating system, the warm air is delivered via a connected system of ductwork.

How does a furnace work?

In a gas furnace, (the most common type of furnace used in homes) natural gas is ignited in the burner and the flames heat up the heat exchanger. The heat exchanger warms up the incoming air and a blower or air handler sends the warm air throughout the home.

Energy Saving Features

When shopping for a new furnace, energy efficiency is one of the most important factors to consider. For a furnace, there are a few important features to keep in mind.

Types of furnaces

There are two main types of residential home furnaces: gas and oil. Most homes today have gas furnaces, but some continue to use oil furnaces. While both will heat your home, there are some differences to consider.

Gas Furnace
Better energy efficiency. Gas furnaces can have an AFUE rating of 89 to 98 percent. Oil furnaces usually have an AFUE rating of 80 to 90 percent.
Initial cost. Gas furnaces are normally more expensive upfront than an oil furnace.
Oil Furnace
Your initial cost will be lower compared to a gas furnace.
Oil furnaces are not as efficient as gas furnaces. Heating oil is also more expensive than natural gas.
Furnace maintenance

A furnace is a complicated machine but when properly installed and maintained, it will run smoothly for years. Here’s a few tips to keep in mind to get the most out of your furnace. For a full list of maintenance tips and service schedule, visit our furnace maintenance page.

Repair or Replace? How do you know?

How long a furnace will last depends on a lot of things including how it was installed and how it’s used and maintained. However, here’s a few things to keep in mind to help you decide whether to repair your furnace or replace it. Check out our interactive repair or replace tool to get an instant recommendation on your system.

You should consider replacing your furnace if
How much does a new furnace cost?

Unlike our HVAC competitors, Trane believes in making the purchasing process as simple as possible. That includes being upfront about the cost of our furnaces. You can find average furnace prices on our pricing guide and local prices on our furnace page. Please note, the price of a furnace depends on several factors including where you live, the unit you select, the size of your home and the difficulty of the installation process. That’s why we recommend talking to a Trane Comfort Specialist™ to get a custom quote for your home.

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