Useful Website Links for Facilities Maintenance Professionals Google Search the internet for information and products. Wikipedia The free encyclopedia that anyone can edit. Amazon Books, movies, music and everything else you need. US Department of Labor Information on demand for facilities maintenance personnel and HVAC technicians. US Green Building Council Information on sustainability, energy efficiency, and LEED credentialing for facilities professionals. US Environmental Protection Agency – Section 608 Information on CFC Licensing and requirements for replacement refrigerants and disposal.