I bought a house 10 months back and I have big issue with my furnace in my ATTIC. So, the furnace is installed in the attic and when ever I switch on air conditioner or heating I can hear vibration sound in my house. I can hear the sound in all 4 bed rooms and in the ground floor too. How can I prevent it?

Depends what is causing the vibration. I would start with the air handler.