Are we really arguing about using cans of compressed gas duster? Theres a risk involved any time you open your computer case, whether it's moisture or static, and that risk increases if you use a product improperly, but in all the years I've been working on my computers I've never had an issue using cans or the compressor system at my old job.
The OP asked a simple question about maintaining his computer. I think the simplest, cheapest, most common thing to do would be to grab a can of air duster from whatever store and reapply thermal paste.
How is arguing about air compressors helping someone who probably doesn't have one?
Also to the OP, keep in mind that laptops typically are going to have higher temps due to poor thermal design, especially if it wasn't designed as a high performance oriented machine. The dusting should help if you've never cleaned it out before, but new paste should give you a pretty big temp drop. From what I've seen in my laptops, the stuff most manufacturers seem to use at the factory is more of a glue than anything and they either use way too much, or not nearly enough.