ISIGUN, was founded in 1984 in Izmir as a privartely owned to design and / or install hesating and solar energy system and plumbing.Shortly after it started its operations , Isigun became a reliable and well-known subcintractor in its area of business , as having comleted thousands of hating , plumbing , solar energy projects in both residential and industrial settlements in aegean ragion.

Isigun reorganized in 1997 and became a limited company : ISIGUN PLASTIC AND ENGINEERING CONTRACTING Ltd. Co. Starting from 1997 , the business area was expanded to include design and installation of HVAC systems in addition to plumbing and solar energy systems both industrial and residential settlements in turkey and abroad.

PROMEK ENGINEERING which is subsidiary of ISIGUN was founded in 2007.
PROMEK produces application projects for HVAC and natural gas systems.