Homeowners should know that downflow furnace installation usually takes place in the attic, can be expensive under certain circumstances and can be done in any type of home. Downflow furnaces cannot be installed on a combustible material, such as carpet or tile.
In addition to the attic, a downflow furnace can be installed on the main floor of a home or in a garage. Downflow furnaces aren't as popular as upflow furnaces because they aren't as efficient. If there is a limited amount of space, a downflow furnace can be installed on its side. There are also furnaces that can become an upflow, downflow or horizontal furnace depending on the homeowner's needs.
Upflow and downflow furnaces are similar in terms of price, but a downflow furnace installation can be more expensive if it's positioned in a small space and under other circumstances. One major advantage of downflow furnaces is they don't require a crawlspace or basement for installation. Some of the disadvantages of downflow furnaces are they aren't as efficient as upflow furnaces and the heat they provide isn't as comfortable as the heat given off by upflow furnaces.
When deciding between an upflow furnace and a downflow furnace, homeowners should focus on energy efficiency and the type of fan motor, such as variable speed and multi-speed. Buyers should also compare how much heat furnaces put out.