Does the noise cease to happen if you turn the cooling function off?
The 10 - 15 Hz "wham" could be a pump or an off-balance fan associated with the cooling system.
It would be very un-pleasant to be sitting on your patio in winds anywhere near that speed. When a storm is imminent just roll up the screens, go indoors and pour yourself a double Scotch.
I am a retired Electronics Engineer. BSEE from Iowa State Univ and MSEE from California State Univ-Northridge.
Still interested in the physical sciences.