Heating ducts as they cool also make banging noises as do.
Loud thump on roof.
It is very loud on the first floor coming from different places on the ceiling not so loud on the second floor.
When warmer moister air returns in spring the roof s components go back to their normal size and tension.
It comes from all around the room.
If it s coming from the radiators you may have condensed steam.
Most of the noises seem to be coming from the top of the walls.
These need to be.
Its not all in one area.
The energy released by this movement is what causes the loud banging or cracking sound.
Very loud mysterious thump in the ceiling above the first floor of 3 story house.
A loose shutter on an attic window or loosened attic vents can cause a banging sound if it s windy as can branches hitting the roof.
The thump occurs several times a day usually in the evening.
It is unrelated to plumbing usage or to start and stop of hot water heating system.
If nothing obvious turns up you ll need to hire a roofer to look for a loose vent cap on the roof or a piece of flashing that s moving and transmitting the noise down through a rafter and into the.
If the troubling sound is a whine replace the unit s filter before turning it back on the restricted air flow caused by a dirty filter could be the cause if the sound returns shut down the system again and leave it off until a heating ventilation and air conditioning hvac professional can take a look unless temperatures are so extreme that you have no choice but to use it.
The noise could be coming from your roof during the hottest days of the summer when the rays of the sun beat down on the shingles.