Presevi manufactures electronic remote on/off controllers for retrofitting arrangements using mixed signal processing techniques. The company supplies the electronic remote controllers in models retrofitted to the existing window air conditioners by replacing existing electro-mechanical panels without alterations. Adopting this conversion method can save the considerable amount of energy as well as operating costs directly or indirectly. The accurate electronic thermostat that prevents over/under cooling, while keeping a comfort condition obtains direct saving of energy. Whereas indirect energy saving can be obtained by the functions like timer, sleep and remote control. The company supplies these electronic remote controllers with intelligent time delay that is otherwise called as safety time delay to protect the air-conditioners. The electronic remote controllers come with salient features like power down memory and timer. The controllers can be applied for retaining previous settings after power interruption. The company electronic remote controllers with on/off timers those are selectable by using remote handsets.