I recorded my air conditioner sound recently. It's one of those thermostat style ones, not the window attachment one. This was recorded right on the vent taking in air as well.
Group kmm-the start-up of a dorm air-conditioner. Recorded directly on axis, low gain, pointed directly at vent. Recorded with a zoom h4 handheld recorder. Normalized in peak pro 6.
Group kmm-recording of an air-conditioner starting up. Faint leaves and ambient sounds can be heard in the background. Recorded with a zoom h4 handheld recorder. Normalized in peak pro 6.
Found this air vent on a location shoot. The vent was making a strange chirping noise. . . Like an alien cricket. Recorded with a tascam dr680 and sennheiser mkh-416.