I got the M2 air recently as a DJ and was really exited for it to have no fam or loving parts. I don’t mind fan noise too much but my old 2010 MBP would constantly increase and decrease the fan speed which was extremely annoying for me.

Anyway, I’m so focussed listening to the lack of fan noise that I sometimes hear a ‘phantom’ fan noise. Like the lack of fan noise doesn’t seem right so my brain makes it up.

I love this m2 Air so much.

> it turned out it was the neighbor's HVAC unit

The problem is everywhere. The HVAC industry really cheaps-out on rubber grommets.

The problem is rubber grommets??

I suppose you have to cut costs somewhere....

Outdoor unit makes noise, but noise travels up and out, not over. Problem is vibrations. Screw a metal vibrating thing into a concrete pad, vibrations travel through pad into ground, across the ground, vibrating the foundation, walls, glass, etc. of neighboring home. Rubber grommets between the metal and the concrete pad mitigates vibration. It's actually supposed to be there for all metal feet screwed into pad, but you rarely see it, causing unnecessary low frequency noise pollution, and the vibrations themselves, as far as vibrations go, are bad vibrations.

How could i diy good grommets for my house safely?