well it can be posible,,,,,,,,the most simple and easy way is to use the split ac circuit,,,,,,,,,,there is a PCB inside the indoor unit of split ac which controls all the electronics including the remote control system,,,,,,,,,simply buy that complete PCB along with remote control , LCD is also mounted on that PCB ,,,,,,,,,its availabe on ac fride spare parts shops ,,,,,,,,but be carefull before buying as you need the one which has timer option , as you know some ac has sleep timer and some has not,,,,,,,,,so chose wiselly ,,,,,,,,you can make remote control timer system for your home appliances ,,,,,,,but i guess it will be a complex system and i really dont know you can handel all that electronics or not ,,,,,,,,,,,