Is it safe to drill holes in a pc case for more ventilation

I would be careful of any metal shavings. I would take out the components and clean out the case with compressed air and re-install the computer.
 
Don't put holes in your case because you are lacking proper ventilation
.If your computer case has weak metal-steel material, if you don't know what your doing you could warp it by accident.
Run it by a good computer store and ask them to do it for you.
 
I took the side off my case, put a fan there to keep it cool till I can afford to get it done correctly.

Exactly this is what I did but I left my side door off my case for the whole spring-summer, with good cooling in my room it stayed chilled till the end of august in 2016. :P
 
Exactly this is what I did but I left my side door off my case for the whole spring-summer, with good cooling in my room it stayed chilled till the end of august in 2016. :p
Completely understand. I'm trying to get my XP working so I can get this W10 taken care of.
 
I actually have a spare side panel for one of my systems so I may look into mounting a fan or something on it
 
It's definitely fine to do with the proper tools. It isn't exactly rocket-science, after all. However, you will leave lots of metal shavings, so best to work on an empty case or a side panel removed & then thoroughly cleaned afterwards.

I added a blowhole in a case with a metal cutting hole saw, easy-peasy. Used a deburring tool (a round file is fine), then sandpaper. It's also a good idea to put masking tape around the circle to help keep it neat. I started the center hole with an awl & a small drill bit before moving to the hole saw. You can paint or permanent marker the bare metal though usually the fan guard/filter covers it.
 
It's the panel that's already supposed to be removable so that shouldn't be an issue
 
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