That's a sign that it's a laptop. Not that it is using a lot of electricity. Laptops are notorious for having bad overheating problems. I am using a 600w PSU on a high end custom computer, and it is on most of the time. I haven't noticed a significant jump in my electric bill ever since buying it. Computers aren't like toasters, they don't actually draw a huge amount of power, especially if it isn't a powerful computer. Also, if your laptop is getting so hot that you have to turn on the air conditioner to cool your house down from the heat it generates, you really need to get a new laptop that isn't faulty. On the off chance you mean cool the laptop down itself, then get a cooling pad, they are cheap and REALLY help with overheating.