good / bad ideas: 1. have an extra fridge. small 170 litres. can i use it like an ac - cool the room? switch it on and leave the door ajar? 2. buy five-six 15x15 feet white canvas, put it on my roof. put 2-3 buckets of water on roof. canvas acts as a buffer between main roof and sun. water helps keep it all cool its summer in Bangalore and new place is on the top floor so hotter than before! like to know if i should try any of these? is 1 bad? will 2 be effective at all?