It can damage furnaces which have a high efficiency rating.
High efficiency gas furnace attic.
A mid efficiency furnace 80 and 90 afue vents exhaust gases out of the home typically through the roof.
As long as you have a fully insulated attic there are rarely instances when we would advise against an attic installation.
There is a common misconception that this is not possible for high efficiency furnaces.
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It turns out that for many homes a very convenient place to place a furnace is in the attic.
A high efficiency condensing furnace requires specialized venting.
I had a new high efficiency furnace installed in my unheated attic and had the same problem of the furnace not running because the condensate trap had ice in it.
High efficiency furnaces aren t usually recommended for an attic.
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Most of the issues that furnace might experience in an attic are due to extremely cold weather in this poorly insulated space.
That means you are heating the environment without benefiting from the cost or energy expenditure.
I didn t get much help from the gc or the hvac contractor he hired so i installed a clamp lamp with a 60 watt bulb to shine on the trap.
Since this also causes the furnace to run longer to make up for the displacement your energy bills will likely increase if you decide to place your furnace in the attic.