Rittal TopTherm Blue e Cooling Units & Accessories The Rittal TopTherm ‘Blue e’ cooling unit is a high-performance thermoelectric light-weight unit featuring an eco-mode control function for demand-orientated climate control. The unit utilizes the Peltier effect to achieve high accuracy and low power consumption whilst minimizing moving parts – in turn increasing lifespan and reducing maintenance needs. The Rittal TopTherm 'Blue e' cooling unit also uses an intelligent operating system – stopping and starting fans as required to maintain accurate temperatures, whilst saving energy. Additionally, existing parts from previous models have been streamlined to yield greater energy efficiency.