Packaged Temperature Controllers. Modular, transportable, self-contained, air temperature control systems used for event and construction heat applications. They provide accurate temperature control and air handling for large capacity temporary heating applications. They are designed to withstand the wear and tear of construction sites and the rental market. Their larger heat capacity and higher air volume fill the gap between small, portable air heaters and the large, fixed commercial air handlers used for permanent installations. They are used to provide temporary comfort heat at large capacity special events, comfort heating during commercial construction, and for curing plaster and drying paint in commercial construction.