Should I set my furnace fan to "auto" or "on"?

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Should I set my furnace fan to "auto" or "on"?It is a Carrier 110 series from 2004. The cost of running it is the main consideration. I have allergies so running it all the time helps for that.

-She
auto is more energy efficient

-tumbleweed1954
If it helps your allergies then leave it on. "AUTO" runs whenever the heater or A/C are running.

-Dyl P
IS IT POSSIBLE TO DO BOTH!

-Brian M
normally they are set to auto. that way they only run when heat/cool is called for. running it constantly would probably shorten the lifespan of the motor. set it to auto and take a benadryl. =)

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