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Memory foam refers only to the “viscoelastic” behaviour exhibited by the foam. Memory foams can encompass a wide range of quality, durability, comfort, and other characteristics. Here’s a few things you should look for when considering the purchase of a memory foam product.

Memory foam is actually a rather advanced material, and has only gone down in cost enough to be practical for personal use in the last ten years or so. More specifically, it is an open-cell foam with viscoelastic properties, typically using polyurethane. If this means nothing to you don’t worry, and read on!

I recently hurt my back and needed a new mattress – but couldn’t afford the high-end memory foam bed I wanted. So I built my own for a third of the price!

As the summer progressed, I felt like I needed to improve my initial design. Luckily enough the science department had just thrown away an old freeze drying machine which had a perfect radiator. A few minutes crouched by the dumpster with some hand tools, some minor adjustments, and the Black Beauty was born.

Credit goes out to Pete H. in sunny England for this great build. This version of the homemade air conditioner removes the need to drain water outside by using an aquarium pump, and sits on a rotating base.

Spencer from Ohio made this incredible build using some good old american muscle.

This version of the homemade air conditioner implements two improvements, a flow valve and a condensation collector.

Several people have asked me if I have managed to quantify the performance of this system. I ran a few quick numbers – accuracy is not going to be great due to measurement error. In terms of rough numbers though, I’m pretty happy.

I decided to modify the system to run off a garden hose, for increased reliability and to prevent late night stumbles from flooding my room.

The major factor affecting the efficiency of the air conditioner is the heat exchanger.