A downflow furnace draws in cool air from the top, passes it over a heat exchanger to warm it, and then releases the heated air at the bottom to circulate through the space.

What is a Downflow Furnace?

A downflow furnace draws in cool air from the top, heats it over a heat exchanger, and releases the warm air at the bottom. This airflow configuration is commonly found in attic installations, with the warm air circulating through the home via ductwork. Due to the natural tendency of heat to rise, downflow furnaces may experience greater wear and may be less energy efficient.

Upflow vs. Downflow Furnace

An upflow furnace operates oppositely, taking in air from the bottom and releasing warm air from the top. This configuration is often installed in basements and is generally more energy efficient due to the natural rise of warm air.

Horizontal Flow Furnace

In a horizontal flow furnace, air enters from one side and exits from the other. This layout is ideal for limited spaces, such as attics or crawl spaces, where vertical placement isn't feasible.

Choosing the Best Furnace Configuration

Selecting the right airflow configuration depends on the location of the furnace. An upflow configuration is ideal for basements, downflow works well in attics, and horizontal flow fits in crawl spaces.

Key Considerations for Furnace Selection

When choosing a furnace, consider factors such as:

• Energy efficiency (AFUE rating)
• Cost
• Fuel source
• Sizing
• Installation location

Our HVAC professional can guide you in selecting the best configuration and placement to ensure efficiency and longevity for your system.