Isn’t an RCAC very noisy?
Today, up-to-date indoor units purr at a whisper-like level of 19-53 dB. So even at their loudest, they’re still quieter than the 60db we use in ordinary conversation.
Meanwhile, outdoor units operate at 42-69 dB — the range of a refrigerator, light traffic, or a normal discussion. This makes modern air conditioner units some 20 times quieter than 20-30year old units, so most people won’t need to worry about picking the quietest air conditioner.
Some single-unit portable reverse-cycle air conditioner units can be quite loud – check noise level rating before purchasing