@florekm I try to keep my apartment as clean as I can. Not saying I'm doing a flawless job, but it helps preventing the computer and electronics getting more dirty than they need to be.
I probably dust my 7-8 year old computer once or twice per year. It's dusty by then, but it's not suffering from any heat issues or so. It's currently sitting at 33°C in a room at maybe 22°C.
I also keep a towel over my keyboard when I don't use it. It helps keeping it cleaner for way longer! :)