Symptoms
- Temperatures have crept up gradually over months without any hardware changes
- Visible dust or pet hair on fans, vents, and heatsink fins
- Fans run louder than they used to for the same workload
- PC is in a dusty environment or hasn't been cleaned in over a year
Likely causes
- CommonDust coating heatsink fins, reducing their ability to transfer heatA thick layer of dust acts as insulation rather than a heat conductor.
- CommonDust clogging fan blades and intake/exhaust ventsThis restricts airflow even if the fans themselves are working fine.
- PossiblePet hair or debris blocking case filters entirelyHomes with pets often see faster buildup than expected.
- PossibleCase filters never cleaned since the system was builtDust filters need periodic cleaning to keep doing their job.
What to do
- Power down and unplug the PC, then move it to a well-ventilated area to clean, ideally outdoors or in a garage.
- Use compressed air to blow dust out of the CPU cooler, GPU, case fans, and power supply vents, holding fans steady to avoid over-spinning them.
- Remove and clean any dust filters on the case's intake fans, some of which can be washed and dried.
- Wipe down the inside of the case with a dry microfiber cloth where accessible.
- Check cable routing to make sure cables aren't blocking airflow paths inside the case.
- Reassemble and monitor temperatures under load to confirm improvement.
Tools and parts
- Compressed air
- Microfiber cloth
- Small brush (optional)
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.