Could be an exhaust fan.
Attic light is buzzing.
In most cases the buzzing will be heard for a few days and then it will cease due to the insects death.
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Bats in attics can make noises.
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If its random it could be a critter squirrel raccoon etc.
Noises in the attic can come from several different types of animals.
By any chance is there a ventilation fan in the attic.
Sizzling popping or crackling sounds when a wall switch is turned on and off may well mean the switch is defective or worn out.
Outlet or switch humming.
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The ballast is the device that is used to regulate a fluorescent light s voltage.
There are a couple of things can cause humming or buzzing noise that is coming from your outlet or switch.
What s happening inside the switch.
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And 99 of them leave the home without anyone knowing they were ever there.
The one i m familiar with creates a constant vibration when turned on but perhaps yours just at start up.
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Similar to the buzzing caused in incandescent bulbs buzzing in fluorescent lights with older ballasts are occurring due to the constant re striking that happens when the ballast is no longer able to regulate voltage properly.
A buzzing fluorescent light may just need to be replaced but it could also be caused by an old ballast.
It s fall and critters like to be in attics.
Some kind of wildlife is often the culprit for the noise in their attic.
Look for light bulbs that indicate directly on the packaging that they can be used with dimmer switches.
The contactor on the outside unit was the problem.
Replacing the bulbs with a different type of bulb such as a rough service bulb can fix this electric noise.
A buzzing sound in a standard wall switch is one of several indicators that the switch may be going bad.
Typically they automatically cycle on off depending on temperature and humidity.
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Sometimes central a c systems buzz briefly when cycling on off.
Lot of attics have them for heating and cooling.
First it could be a loose wire.
The interrupted current can produce a vibration in the electromagnetic field within the light bulb filament or within the switch itself which can cause a humming or buzzing noise.
