Symptoms
- Fans run louder than they used to for the same tasks
- Case or laptop feels hotter than before during normal use
- Performance drops noticeably during longer sessions
- Visible dust or fuzz around vents and fan openings
Likely causes
- CommonDust and pet hair accumulating in vents and heatsink fins over timeThis is the single most common cause of gradual performance decline in an otherwise healthy PC.
- PossiblePoor room ventilation or a dusty environmentHomes with pets or carpet tend to see faster buildup.
- CommonNever having cleaned the PC since purchaseMost manufacturers recommend cleaning every 6–12 months for typical use.
- PossibleA desktop placed on carpet or a low-airflow locationThis increases how much dust and lint gets pulled in.
- PossibleCase fans with clogged filters (if present)Dust filters need periodic cleaning too, or they defeat their own purpose.
What to do
- Power down the PC completely and unplug it (remove the battery if it's a removable laptop battery).
- For a desktop, open the side panel and use compressed air to blow dust out of the case fans, heatsink, and power supply vents, working from the inside out.
- For a laptop, use compressed air on the visible vents; deeper cleaning usually requires opening the bottom panel, which some models make easier than others.
- Hold each fan's blades still while spraying air to avoid over-spinning them, which can damage the bearings.
- Clean any dust filters if your case has them, either with compressed air or a quick rinse (make sure they're fully dry before reinstalling).
- Reassemble and power on, then monitor temperatures with a free tool during normal and heavy use.
- Compare fan noise and performance to before cleaning to confirm improvement.
- Repeat this cleaning every 6–12 months, more often in dusty environments or homes with pets.
Tools and parts
- Compressed air
- Screwdriver (for case/laptop panel)
When to call a pro
If you're not comfortable opening a laptop's case, a repair shop can do a full cleaning (and repaste if needed) safely.
Safety
Use caution
Make sure the PC is fully powered off and unplugged before cleaning, and hold fan blades still while using compressed air to avoid spinning them beyond their rated speed.