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36 <br />Packaged Terminal Air Conditioners (PTAC) <br />We considered the installation of units similar to the typical "through-the-wall° units used for <br />conditioning motel rooms. <br />Advantages <br />• Ease of installation - <br />• Lowest installed cost <br />• Individual room/unit control <br />• ,Modular application for individual rooms <br />• Well suited where systems perFormanc~ requirements are minimal <br />Disadvantages <br />• Highest energy cost <br />• Increased electrical service required per installed refrigeration capacity <br />• Limited installation location to outside walls <br />• Median useful life only 6 years <br />• Highest maintenance cost <br />• No indoor air' quality improvement due to lack of outside air control and low air filter <br />efficiency <br />• Least amount of control over building temperature and humidity levels <br />• Noisy <br />• No ability to troubleshoot systems remotely <br />• No capability to be modified for revised space usage <br />• ,Ability for ~nnection to reGnote digital controls limited to "on-ofP' service only. <br />An illustration of a typical system follows. <br /> <br />(36) <br />