Hi, if you posted here i will suppose that you have an arduino 101, then i recommend you to use MIT app inventor with arduino 101 extension, it help you to direct manage arduino 101 pins using Android (5 or newer) with bluetooth also you only program once, as a comment apart from arduino programing you also need extra electronic to handle the needed power for you LED lamps, and fan, also you need a temperature sensor, and for rough use i recomend a case to put your arduino.
app invetor 2: http://ai2.appinventor.mit.edu
link to arduino 101 extension: http://iot.appinventor.mit.edu/#/arduino101/arduino101intro
cheers.