This sound is from Air conditioner SFX Library

The air conditioner in the library hums softly as it runs coarsely in the background. The soothing sound is punctuated by the occasional chirping of birds outside, creating a calming atmosphere for those browsing the shelves of books. The wall air conditioner fan can be heard switching from a low to high setting, providing a steady flow of cool air throughout the room. The familiar sound is a constant presence in the library, helping to maintain a comfortable temperature for visitors and staff alike.

As a Beechcraft King Air 200 interior air conditioner turns on, runs, and then turns off, the sound of the aircraft's cooling system can be heard faintly in the distance. The steady rhythm of the air conditioning fan from a Mitsubishi unit adds to the background noise, blending seamlessly with the sounds of the library. In the industrial workshop ambience, the interior of the space comes alive with the sound of a fan as a mason works diligently on a project. The ambient noise creates a sense of productivity and creativity in the air.

Amidst the summer ambience of the night, the light chirping of crickets can be heard alongside the rustling of leaves and the distant passing of a car. The air conditioner continues to hum softly in the background, adding to the tranquil sounds of the evening. A Jeep Wrangler from 2004 turns on its fan setting to provide relief from the heat, while an extractor fan switches to lower speed, adding a subtle variation to the ambient noise. The cart wheel gets stuck momentarily, creating a brief interruption in the otherwise steady flow of sounds.

In the final moments, the extractor fan turns off with a soft click, bringing an end to the background noise. The flue switches on and off in three mode cycles, adding a mechanical element to the otherwise natural soundscape. The air conditioner is coated with a layer of foam, enhancing its efficiency and reducing noise levels. The broken AC vent rattles softly, adding a touch of character to the room. Roomtones fill the space as the air conditioner runs intermittently, adding to the unique auditory experience of the library. These sounds and more can be played and downloaded here.