No. One of the most important design criteria for the equipment manufacturers is a low operating noise level. Many systems incorporate ‘quiet’ or ‘silent’ modes, which provide sound levels as low as 20 dB (A) from the indoor unit and 43 dB (A) from the outdoor unit. In basic terms, you have to be within 2 meters of these units in the quietest of environments, to hear any indication that they are running. How long does it take to install? This is dependent on the type of equipment selected and the complexity of the installation. A rough ‘rule of thumb’ would be, for a residential setting, with one lounge machine and two bedrooms, the installation would be complete in one day or two.