Thermo Manufacturing is Dedicated to Developing Innovative Products for the Heating and Cooling Industry Incorporated in 1992, Thermo Manufacturing resulted from a series of ideas founder Darryl L. Snyder had for many years while he was an HVAC contractor. Snyder's credentials as a sheetmetal journeyman contributed to his ability to find solutions to longstanding HVAC problems. His first creation was ThermoPan®, a lightweight, sound absorbing alternative to the sheetmetal used in return air ducts.