How to Lower CPU Temperature: 10 Easy Fixes

If you want to lower CPU temperature quickly, start with the easy wins — clean the dust out, improve the airflow and reapply the thermal paste — before you spend money on a new cooler. Most hot CPUs are not broken; they are just dusty, badly cooled or working too hard.

Why your CPU runs hot

A CPU gets hot when it works hard, when the cooler cannot keep up, or when hot air has nowhere to go. A dusty cooler, dried-out thermal paste or a case with no airflow will all push the temperature up. Our why is my CPU overheating guide explains the causes, and our CPU temperature guide tells you what is actually too hot. Before you start, check your temperatures with our how to monitor CPU temperature guide so you can measure the improvement.

The 10 easy fixes

Here are the ten fixes, from the easiest to the most involved. Start at the top and stop when your temperatures are where you want them.

1. Clean the dust out. Blow the dust off the cooler, the fans and the case filters with compressed air. Dust is the single most common cause of a hot CPU, and cleaning it costs nothing.
2. Improve the airflow. Make sure the case fans are pointing the right way — front and bottom in, back and top out — and that cables are not blocking the air. Our how to improve PC airflow guide shows the layout.
3. Reapply the thermal paste. Old paste dries out and stops transferring heat. Our how to apply thermal paste correctly guide shows the pea-sized dot method, and our best thermal paste guide picks the best pastes.
4. Reseat the cooler. A cooler that is not tight enough cannot cool the chip. Take it off, check the paste, and mount it again, tightening in a cross pattern. Our how to install a CPU guide shows the process.
5. Check the fan is spinning. A dead or slow fan will let the temperature climb fast. Our CPU fan not spinning guide covers the fixes.
6. Close background apps. A browser with 40 tabs or a stuck updater can push the CPU to 100%. Our how to fix high CPU usage in Windows guide shows how to find the culprit.
7. Undervolt the CPU. Lowering the voltage a little reduces heat without losing speed. Our overclocking vs undervolting guide explains it, and our how to fix CPU throttling guide shows how it helps.
8. Lower the power limit. In the BIOS, a lower power limit means less heat. It costs a little speed, but it is a good trade on a hot laptop.
9. Upgrade the cooler. If the stock cooler is too weak, a bigger air cooler or a liquid cooler will drop temperatures by 10 degrees or more. Our how to choose the right CPU cooler guide and our air cooler vs liquid cooler guide can help.
10. Move the PC. A PC crammed into a closed cabinet or against a wall cannot breathe. Give it space on all sides and keep it off the carpet.

Fixes that cost nothing

The first six fixes on the list are free: clean the dust, fix the airflow, reseat the cooler, check the fan, close background apps and undervolt. Do those first, and measure the temperature after each one. In most cases, dust and airflow alone are enough to bring a hot CPU back to normal. Our CPU cooling basics guide explains how the cooler and the case work together.

How to check it worked

Run a benchmark before and after with our how to benchmark your CPU guide and our best CPU benchmark software guide. If the temperature dropped and the score stayed the same or went up, the fix worked. If the chip still overheats after all ten fixes, it may be damaged — see our how to check if your CPU is damaged guide — or simply too weak for the job, in which case our best desktop CPU in 2026 guide can help you pick a cooler, more efficient chip.

The bottom line

To lower CPU temperature, clean the dust, improve the airflow, reapply the paste and check the fan — those four free fixes solve most hot CPUs. Spend money on a cooler only after the free fixes are done. For more help, browse our troubleshooting tips and our cooling and thermals guides.