DIY air conditioner

It's starting to get hot in Kyoto, especially upstairs in my house, so my girlfriend has been telling me we should buy an air conditioner, but those are on average $400 to $700 and drink a lot of electricity. I remembered once seeing a DIY air conditioner on reddit once, so today I went to a "home center" and got a few things: a bucket (was looking for a styrofoam cooler but they didn't have any), some PVC elbows, and a small fan. Here's the build:

That's it! Total cost of materials including the fan: about $30! And it will use way less electricity than a regular air conditioner.