If the ball bearings are to blame you may need to lubricate them to reduce the friction and quiet the noise which is often described as a rubbing or humming sound.
Ball bearing in ceiling fan.
This instructable guide will show how to overcome the squeaky noise make by a ceiling after some time the problem of squeaky noise that cant be solved after many re greasing attempt a replacement of ball bearing are required normally after a decade.
Ceiling fans circulate air to make the room more comfortable all year round.
My ceiling fan would sometimes not start and making rumbling sounds bearings i did not want to replace or tear down so lifted plastic cover on top and liberally sprayed machine oil over exposed bearing through slots underneath wd 40 this has cured problem perfectly just dry bearings would probably be better to use spray grease if you have cheaper than new fan or bearings and only a few.
Faulty bearing causes noise in ceiling fan.
While newer models have self oiling bearings older hampton bay models may need oiling.
They also give the air conditioning and heating system a break by maintaining a comfortable temperature throughout the room or home.