Dust on most parts of the computer won’t usually cause much of a problem with the except of heatsinks and fans, and the PSU (power supply unit)
Dust in the air clogs up the fans and heat sinks so they have to work harder and make more noise. Fan´s are the main source of noise in a computer. A laptop once sounded like it was a jet engine! After a thorough clean the fan barely came on.
If the PSU becomes dirty it’s fan will become louder, but more importantly it’s ability to convert electricity to the various required levels could be affected. In the worse case this could cause a competent to fail and/or cause a spark and potential fire risk.
We can clean your computer´s insides.
Reading about solving overheating problems may also be of interest.