Look for under ~50 dB; inverter models run 45–52 dB on low, versus 55–60 dB for fixed-speed units at full tilt.

Yes — the compressor ramps up and down instead of slamming on/off, removing the loudest part of a normal cycle and holding a steadier temperature.

Quiet, certified units with timers and night mode are fine overnight; keep the window kit sealed and the hose clear.

No — same BTU, just better sound control; an insulated, inverter unit cools as well as a louder fixed-speed one.

On a level, hard floor away from the bed wall, with the window hose straight and short; a soft mat under it cuts vibration buzz.