RJI is a sister company of Electronic Support Systems(ESS) and will continue to operate as independent business units to support both the local HVAC and Critical Infrastructure markets.

Electronic Support Systems (ESS) is a manufacturer’s representative company offering a complete line of high quality critical infrastructure products supporting IT equipment. Our product line covers power protection, power conditioning, and precision environmental solutions. With these products we are able to provide clean reliable power and precision cooling to maintain our customers IT equipment environments 365 days per year.

Providing solutions for our customers throughout Eastern Missouri and Southern Illinois for over 30 years.