This could be due to the fan being clogged with dust and debris, Inspect the Fan port and clean if necessary
There could also be dust in other components of the laptop, I suggest a disassembly and a thorough cleaning. You could get a External Fan pad so the internal fan doesn't have to work so hard and therefor less debris would enter your system, I have done this with all my laptops and only not use them if I have to and the results are minimal debris catching inside and building up.
Buy a can of compressed air and shoot some air into the ports while the laptop is running, if your allergic do this outside to lessen your exposure, when done it should perform better. Cans of air are usually between 5-15 dollars and last a few good cleaning if you don't want the hassle of disassembly.
Let me know and keep me posted