A conference room is required to be conditioned so that the temperature is maintained at 21C. The capacity of the room is 75 people, each one dissipates heat at a rate of 100 Watts. The room has 30 LED spotlights with a capacity of 50 Watts. Additionally, a heat transfer to the room, through the environment, of 10,000 KJ/hour has been approximated. How many air conditioners need to be installed, if each one has a nominal capacity of 4 KWatts?