You need to put a stop to this or the metal firebox inside your fireplace could rust creating a fire risk.
Vibrating sound in eaves of attic.
It s intermittent depending on how gusty the wind it.
On a windy night we can hear it inside and it is very loud the stronger the wind the louder the noise.
Assuming this vibration noise occurs only when the a c is running which should be real easy to check out and you cannot find loose mounting bolts or loose metal ducting thgat is vibrating then you should not quit using the unit and call a heating and a c tech to check it out.
Add a wood block thick enough so the eliminator and block equals the block thickness if you must.
The most common noise inquiries we get from homeowners are concerns about sounds coming from the attic.
But most of the time it s an animal and it s pretty easy to tell when the noises are coming from something living.
It could even be from the heating cooling system or branches of a nearby tree scraping against the roof.
So scratching sounds in the attic at night could be from a number of different nocturnal animals.
The source of the problem could be as simple as loose flashing or a dislodged chimney cap.
If there s a source of infrasound outside that s 0 5hz off one of your building s resonant frequencies the centre of whichever panel wall floor ceiling is resonating will cycle between extreme vibration and none every two seconds this is a beat tone.
When the wind blows from the east something is vibrating in our attic a low hum that sounds like there s a motorcycle outside.
We had a re roof done a couple of years ago and not long after a noise started coming from the gutter areas when the wind blows in a certain direction we get quite a load what can only be described as a groaning vibrating sound.
See wind noises on roofs below squeaking and creaking traced to wind blown things attached to building exteriors such as signs antennas aerials weather vanes.
Fast moving scurrying noises are often rodents like squirrels or rats says bob.
From your motorboat engine dying description and since you say vibrating my first guess would be an attic ventilation fan a c condensor outdoor fan garage unit heater fan or hydronic heating system circulating pump possibly with bearings starting to get loud due to lack of lubrication or just plain old age wear and tear.