PSG Controls, Inc., the innovator of the ACCUSTAT®, is located in Perkasie, PA. We have over 30,000 square feet of production area dedicated to manufacturing thermostats and related HVAC stand-alone and system controls. We have been in business for over 40 years and have been producing the ACCUSTAT®, our best-known control, since 1978. We are proud to state that our products are made in the USA. The ACCUSTAT® remains a proven standard for tamper-proof commercial applications, as does its sister product the E- ACCUSTAT®, which is an advanced electronic (mercury-free) version of the original ACCUSTAT®. Our current product offering includes a complete line of non-programmable and programmable thermostats designed for use with most traditional residential and commercial HVAC systems, fan coil systems, and line voltage heat.