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Old 06-12-2011, 04:38 PM   #1
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Replacing HVAC blower motor with a variable speed fan


I have a Heil gas fired hot forced air furnace. I am having Sears install a Kenmore 2 ton 13 seer a/c pump and was told that it would perform better and coll/heat more efficiently if i replace the blower motor with avariable speed one. I am pretty handy and doubt it should present too much of an issue or if I have it in time perhaps i can contract the installer to add it to my bill for installing it. Question is can you even replcae a single stage type motor with a variable speed one? Can it handle that? it is a Heil 5000 - any direction would be appreciated.

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Old 06-12-2011, 05:50 PM   #2
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Replacing HVAC blower motor with a variable speed fan


Better off just getting a new 2 stage VS blower furnace. Then you get a longer warranty on the motor and have a warranty on the furnace. The upgrade your talking about is not cheap.

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Old 06-13-2011, 12:33 AM   #3
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Replacing HVAC blower motor with a variable speed fan


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Originally Posted by beenthere View Post
Better off just getting a new 2 stage VS blower furnace. Then you get a longer warranty on the motor and have a warranty on the furnace. The upgrade your talking about is not cheap.
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I agree with BeenThere. A pre-engineered packaged system would be better. Be careful - if you install a variable speed system, and if the blower doesn't move enough air over the evaporator it can freeze. Additionally, if the temperature rise across the heat exchanger is too high due to the characteristics of the retrofit variable speed motor and associated CFM, you could overheat and damage the heat exchanger.
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