I recently had a brownout due to weather related power grid issues. The
voltage on my 120 volt circuits was down to about 100-105 volts.

Any feedback regarding safe voltage range (specifically minimum) for motors
in refrigerator, freezer, sump pump and furnace blower? I do want to
protect these items while at the same time it is nice to let the furnace run
when it is 15 degrees out!

Thanks...