The quickest ways to lower your CPU temperature are to clear out dust, fix your case airflow, and reapply old thermal paste. Those three cost almost nothing and can drop load temperatures by 10–20°C on their own. If you have already done that and the chip still runs hot, you are looking at a better cooler or a quick undervolt. Here are the nine fixes I actually reach for, roughly in the order I try them.
Let me be straight with you. After years of building and repairing machines, I can tell you that overheating is rarely some exotic fault. Nine times out of ten it is dust, bad airflow, or paste that has dried into chalk. Start cheap and simple before you spend a penny. And if you are not even sure your temps are a problem, read our guide on what a normal CPU temperature actually looks like first – you might be panicking over nothing.
1. Clear out the dust
This is the big one. A heatsink packed with dust cannot move heat, full stop. Pop the side panel off, grab a can of compressed air, and blow out the CPU cooler, the fans, and the front intake filters. Do it outside or over a bin. If it has been a year or more since the last clean, this single step can knock 5–10 degrees off your load temps.
2. Fix your case airflow
Air has to get in cold and out hot. If your case is starved of intake, or your cables are strangling the airflow, the cooler is fighting a losing battle. Aim for a simple front-to-back, bottom-to-top path: intake fans at the front, exhaust at the rear and top. Even tidying your cables behind the motherboard tray helps more than people expect.
3. Reapply the thermal paste
Paste dries out over two to three years and stops transferring heat properly. Scrape off the old stuff with a bit of isopropyl alcohol, and apply a fresh pea-sized blob. Do not slather it on – more is not better. Our breakdown of how much thermal paste to use per CPU covers the right amount. A good repaste alone can drop load temps 5–10°C.
4. Make sure the cooler is actually seated right
If you just repasted and temps got worse, the cooler is probably not mounted evenly. Check that all four screws or clips are tight and balanced, and that the cooler sits flush against the chip. A cooler mounted crooked makes poor contact, and poor contact means heat goes nowhere.
5. Cool the room, not just the rig
Your CPU can only be as cool as the air feeding it. A PC in a hot, stuffy room in summer will run hotter no matter what you do inside the case. Get it off the carpet, give it breathing room, and open a window or run the AC. Sounds obvious. People still ignore it.
6. Sort out your fan curve
A lot of boards ship with fans set to whisper-quiet, which keeps things silent but lets temps climb. Jump into your BIOS or a tool like Fan Control and set a more aggressive curve, so the fans ramp up sooner under load. You trade a little noise for a noticeable temperature drop.
7. Undervolt the CPU
This is my favourite trick because it is basically free performance-per-degree. Lowering the voltage your CPU draws cuts heat output with little or no loss in speed. Use Ryzen Master, Intel XTU, or your BIOS, drop the voltage in small steps, and stress test for stability. Done right, undervolting can shave 5–15°C off a hot chip.
8. Upgrade the cooler
If you are still running the stock cooler that came in the box, this is the single biggest jump you can make. A solid aftermarket air cooler handles most chips beautifully, and a 240mm or 360mm AIO liquid cooler tames the hottest high-core-count CPUs. This is the one fix worth spending real money on.
9. Rein in heavy background load
Sometimes the chip is hot because it is genuinely working hard – and you did not realise it. Background updates, crypto miners hiding in dodgy software, or streaming while you game all pile on heat. Yes, streaming does heat up the CPU, sometimes a lot. Check Task Manager and shut down what you do not need.
How much each fix actually helps
| Fix | Typical temp drop | Cost |
|---|---|---|
| Dust removal | 5–10°C | Free |
| Better airflow | 3–8°C | Free / cheap |
| Fresh thermal paste | 5–10°C | Low |
| Undervolting | 5–15°C | Free |
| New cooler | 10–25°C | Medium–high |
Frequently asked questions
Does lowering CPU temperature improve performance?
It can. A cooler chip is less likely to thermal throttle, which means it holds its boost clocks longer instead of slowing itself down to cool off. You feel that as steadier frame rates and faster sustained workloads.
What is the cheapest way to cool a CPU?
Cleaning out dust and improving airflow. Both are free and fix the most common causes of high temperatures before you spend anything on hardware.
Will undervolting damage my CPU?
No. Undervolting lowers voltage, which reduces heat and stress – the opposite of overclocking. The worst that happens is an unstable setting causing a crash, at which point you simply raise the voltage back a notch.
Work down this list in order and stop when your temps are happy. Most people never make it past step three.
Marcus has been building and tuning custom PCs for over a decade, from budget first builds to water-cooled overclocking rigs. He writes about components, cooling, and squeezing the most performance out of every dollar.