How to Fix MacBook Overheating

A MacBook that is warm under load is doing its job. One that is hot while you read an email needs a closer look. This guide tells the two apart and then cools the Mac down, starting with the fixes that cost nothing.

Is this normal?#

How heat turns into slowness#

1. 1Work

   The chip runs a heavy job.

   ↓→

2. 2Heat

   Chip and battery warm the case.

   ↓→

3. 3Fans

   Speed up, where the Mac has them.

   ↓→

4. 4Throttle

   macOS limits the chip. kernel_task may rise.

   ↓→

5. 5Slower

   Cooling returns speed.

A fanless MacBook, such as an Air, skips the fan step and leans on its aluminium body to shed heat, so it throttles sooner under a long job.

Where the heat comes from#

Heat sources, biggest wins first

• A busy or runaway process

  Fixing one app often drops temperature quickly.

  Software

• Blocked airflow

  Soft surfaces, closed vents, a thick case or a cluttered bag.

  Environment

• Heavy display work

  Extra monitors, high refresh rates and video wallpapers add GPU load.

  Software

• Charging at full tilt

  Fast charging while working hard adds heat.

  Power

• Warm room or direct sun

  Apple lists a normal operating range for room temperature. Hot cars and sunny windowsills fall outside it.

  Environment

• Dust, a failing fan or a worn battery

  Hardware causes need a technician.

  Hardware

The cool-down checklist#

Work through these in one sitting and tick them as you go.

Cool-down checklist

0/8

• Move the Mac to a hard, flat surfaceTables beat beds, sofas and laps.
• Clear the vents and remove any thick case that covers them
• Quit apps you are not usingCheck the CPU tab in Activity Monitor for the busiest one.
• Close extra browser tabs and disable heavy extensions
• Turn on Low Power ModeOpen System Settings → Battery and look for Low Power Mode, if your Mac supports it.
• Install macOS and app updatesOpen System Settings → General → Software Update.
• Restart the Mac
• Move out of direct sun, away from heaters and out of a hot car

Check the display load#

External monitors at high refresh rates and heavy transparency raise the load on WindowServer. If that process is high, see why WindowServer uses so much CPU.

Watch temperatures and fans#

macOS shows no temperature in the menu bar. Utilities such as Stats (free, open source) and iStat Menus add CPU load and sensor readouts, so you can see whether your fixes work. They are optional.

When heat points at the battery#

Stop using the Mac and book a repair if you see any of these:

• The case bulges or the trackpad lifts.
• The battery drains very quickly and the Mac feels warm even asleep. See overnight battery drain.
• Battery Health reports that service is recommended. Our battery health check shows where your numbers sit.

Frequently asked questions#

What temperature is too hot?#

Apple publishes an ambient operating range for Macs, and it does not give a single case temperature that counts as too hot. Use behaviour as your guide: loud fans, slowdowns and a case you cannot comfortably touch while idle all call for action.

Do cooling pads help?#

They can lower surface temperature a little, mostly on laptops with limited airflow. Software fixes usually do more.

Why is my MacBook hot while charging?#

Charging produces heat. It is more noticeable during heavy work. If it is extreme, check the adapter and cable.

Can I clean the fans myself?#

Opening a MacBook is not recommended. Use compressed air only on exposed vents if at all, and leave internal cleaning to a technician.