I read an article about thermal paste and realized I used way too much on my CPU.
I had to pry the heatsink off because it was stuck to the processor.
Applied a small amount of paste, and now my idle temperature is 23 Celsius.
From 45 with the cheap stuff, to 38 improperly applied, to 23. I am truly amazed.
Tip: Instead of covering your CPU with thermal paste, only apply a tiny amount to the center of the chip.