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junoir said:
where do I find furnace blower speed on a 75.000 80%
Need more info like model and serial number and brand. It may have a variable speed blower which is more complicated to change the speed on
 

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You need to check the motor's designation to confirm which blower motor you have and which speed tap is currently being used.
 

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Wiring diagram often on back of blower door panel. Multiple 'taps' are color coded wires that can be swapped to change speeds. Highest usually for A/C etc.
 

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alot of blower speeds are found on control board...why do you ask...don't just change speed...will effect tempeture rise of furnace which can damage heat exchanger ...so why do you want to change speeds?????? ben sr
 
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