What is the difference between an upflow, downflow, and horizontal air handler or furnace?
Thursday, August 26, 2021
These designations refer to the direction that air flows through the air handler or furnace.
Upflow - Air comes in the bottom and goes out the top. This is the most common installation type in Florida.
Downflow - Air comes in at the top and goes out at bottom. Usually installed this way when supply ducts are under the floor.
Horizontal - Unit is installed sideways and air comes in on one side and goes out the other. This is the typical installation when unit is in an attic (shown above) or crawl space. Also see our blog post Should I move my air conditioner into the attic?
Some air handlers and furnaces are designed so that they can be installed in more than one air flow configuration. Others can only be installed one way.
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