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I see the terms "upflow", downflow", and "horizontal" used when describing furnaces and air handlers. What does this mean?

AC Direct - FAQ's - Sizing Your System - Heat Pumps

I see the terms "upflow", downflow", and "horizontal" used when describing furnaces and air handlers. What does this mean?

This page is designed to provide anyone looking for a new HVAC system with a better understanding of frequently asked questions about the selection, AC and furnace sizing and other important considerations in making the best choices for your home or office.

This information guide offers the following categories of information pertaining to proper AC and heating system sizing as well as important guides to ensure you make informed decisions:

These three terms refer to the furnace air delivery configuration.

Upflow means that the supply (warm) air is delivered upward, off the top of the furnace into an overhead duct system.

Downflow means the supply air is delivered from the bottom of the furnace into a duct system beneath it.

Horizontal means the furnace will lay on its side for use in an attic or tight basement.

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