I am on the ground floor of a 3-story apartment building. The apartments in my stack are 2 bdrm. with a third room that is a living, dining, kitchen combo. There is a small window a/c unit in the wall of the main room that is supposed to cool all 3 rooms. The tenants in the unit above me. Their Master BR is directly above mine. They bought a free-standing a/c unit which causes noisy vibrations in my Master BR but not in my other rooms. I complained to management and they finally build some sort of a noise suppression platform which I have not been allowed to view. Now, when I walk in the Master, I don't hear the vibration noise. However, when I lay down in my bed, I still hear the vibrations. I made sure my bed frame is not touching the wall. Sometimes, it helps if I sleep with my head at the foot of the bed but not always. Does anyone out there understand why I now only hear the noise when I laying down. I can clearly hear the noise begin and end as the thermostat cycles the unit on and off. I tap my ceiling with a broomstick when the noise gets really bad. At first, this cause them to turn the unit off. Now, they just ignore it until I get tired of tapping! Thanks for your ideas and suggestions.

First of all, I live in Dubai, UAE. We've been living in our current house since 2003 and it was not like this before. Basically, when the outside temperature goes above 43 C or so, my room's central A/C stops cooling (but the A/C fan continues to run) and starts blowing normal temperature air. The cooling in the other rooms in the house remains fine though (the other rooms have their own A/C compressor and thermostat). I've had this problem for the past 4 years/summers and the maintenance guys have been changing parts and whatnot over the years which result in no improvement. When the outside temperature goes below 43 C or so, cooling starts again. Recently, the maintenance guys cleaned the outdoor unit, indoor unit, replaced the capacitors, and the contactor. I found a thread that deals with the exact issue I am having but no solution is provided in the thread: [url]https://www.doityourself.com/forum/air-conditioning-cooling-systems/520522-my-central-c-doesnt-work-when-its-too-hot-outisde-help.html[/url] When it is hot outside, the compressor may turn on for like 30-40 seconds but then turn off again. Any ideas?