MacBook running hot and fan loud? What's normal and what to do

A MacBook running hot with a loud fan is usually just working hard: a video call, an export, a big download, or a web page that never stops running code. Open Activity Monitor, click the CPU tab and sort by the % CPU column to see what is busy, and keep the Mac on a hard, flat surface so it can shed heat. It becomes a problem when the Mac is hot or loud while doing very little, stays that way after a restart, or shuts itself down.

Macs are built to manage their own heat. The fans speed up first, and if that isn't enough, the Mac quietly slows itself down rather than overheat. So heat on its own is rarely the danger. What you want to know is whether the work causing it is work you asked for.

How hot is too hot for a MacBook?

Warm is normal. The bottom of the case and the area above the keyboard get warm under load, and can get properly hot during long heavy work. Apple's safety information for its notebooks says as much, and adds a warning worth taking seriously: long contact with a warm Mac, such as resting it on your lap or another part of your body for hours, can cause discomfort or even a burn.

macOS doesn't show you a temperature reading, so judge by behavior instead.

The room matters too. Apple designs its Macs to work in air between 50° and 95° F (10° and 35° C). A Mac in a hot room or on a sunny windowsill starts from a disadvantage before you open a single app.

MacBooks with and without fans

MacBook Air models with Apple silicon have no fan at all. They can't get loud, but under long heavy loads they get warm and slow themselves down to stay cool, which is how they are designed to work. MacBook Pro models, and older Intel-based MacBook Air models, have fans, and fan speed rising and falling with the work is normal. A fan that grinds, rattles or clicks is a mechanical problem, not a software one.

If you want to know whether your Mac has had to hold back for heat, type pmset -g therm in Terminal. On a Mac that hasn't needed to, it reports that no thermal warning level has been recorded.

Find what's making it hot in Activity Monitor

1. Open Activity Monitor from Applications > Utilities, or find it with Spotlight (Command Space).
2. Click the CPU tab, then click the % CPU column header so the busiest processes sit at the top.
3. Watch for a few seconds. Something that stays near the top while you aren't using it is your suspect.
4. Click the Energy tab for a second view. Energy Impact shows what is using the most power right now.
5. To quit something, select it and click the stop button (the X) in the toolbar, then choose Quit, or Force Quit if it won't respond.

For graphics work, choose Window > GPU History in Activity Monitor to see how busy the graphics processor is. On battery, the battery menu in the menu bar also lists apps using significant energy, which is a quick shortcut to the same answer.

Processes that often show up

Some names at the top of the list are parts of macOS. Most of them are doing a job and will finish on their own.

Why is my MacBook hot when I'm barely using it?

When the work on screen looks light, the heat usually comes from somewhere you can't see:

• Browser tabs. A page playing video, a web app left open, or dozens of tabs can keep the processor busy even in the background. Closing tabs is often the fastest fix there is.
• After an update or a new setup. Spotlight indexing, photo analysis and iCloud syncing all catch up at once, and can run for a while. It passes.
• Video calls. Camera, microphone, video encoding and background effects all add up. A long call is real work for the Mac.
• External displays. Driving another screen adds work. On some Intel-based MacBook Pro models with two graphics processors, connecting a display switches to the more powerful one, which runs hotter.
• Charging. Charging warms the battery, and charging while working hard adds that to everything else. That's normal.
• Soft surfaces. A bed, a duvet, a cushion or your lap blocks airflow and smothers the bottom of the case, which is part of how the Mac gets rid of heat. Working from the couch or bed has setups that keep both you and the Mac more comfortable.
• Something stuck. A process that has gone wrong can run flat out for days. This is common on Macs that haven't restarted in weeks.

How to cool down a hot MacBook

1. Give it a hard, flat surface. A desk or a table, not fabric. A laptop stand that lifts the back lets more air reach it.
2. Quit what you aren't using, starting with whatever tops the CPU list.
3. Restart. It clears stuck processes in one go. How to restart a Mac covers every way to do it, including when the Mac is frozen.
4. Turn on Low Power Mode. In System Settings > Battery, on MacBooks that offer it. Apple describes it as reducing energy use so the Mac can operate more quietly. Heavy tasks may take longer.
5. Move it out of the sun and away from heaters.
6. Update macOS and your apps. Updates sometimes fix software that was working harder than it should.

Don't put a Mac in the fridge or on an ice pack. Sudden cold can cause condensation, and water inside a laptop is worse than heat.

On Intel-based Macs, a fan that stays at full speed for no reason can sometimes be fixed by resetting the SMC, the chip that manages power and fans; the steps vary by model, and Apple Support lists them. Macs with Apple silicon have no separate SMC reset. A restart, or a shutdown and a short wait before starting up, does the same job.

When should you get a hot MacBook checked?

Contact Apple Support or book a repair if:

• the fans stay loud after a restart while Activity Monitor shows nothing busy;
• the fan grinds, rattles or clicks;
• the Mac shuts down on its own, or stays very slow even when it is idle;
• it gets hot while asleep or switched off;
• you smell burning.

If the bottom of the case bulges, the trackpad looks raised, or the Mac no longer sits flat, the battery may be swelling. Stop using it, shut it down, don't press on it, and take it in soon.

Dust inside older Macs with fans can build up over the years, but opening the case to clean it is a job for a technician. Before any repair, make a backup. If you want a first look yourself, Apple Diagnostics can test the hardware, fans included: on Apple silicon, keep the power button down while the Mac starts and press Command D at the startup options; on an Intel-based Mac, hold the D key during startup.

What Notchpals can and can't do here

For all its characters in the notch, Notchpals doesn't read temperatures or fan speeds. Its Tech care characters look at three things only: the battery's charge, the time since the last restart, and how much space is left on the startup disk. Two of those still matter on a hot day.

The first is uptime. A stuck process is a common cause of a Mac that runs warm for no reason, and a weekly restart stops one from running for long. If Juice, a battery with a gift for drama, is the one you picked for Tech care, it comes out of the notch during the working day once the Mac has been running for more than a week without a break.

JuiceA restart is a dramatic exit and a triumphant return. Do it soon!

The second is the battery. A Mac working hard on battery drains faster than usual, so a hot afternoon away from the charger is often when Juice turns up below 20 percent, fainting on cue. Plug in, close what you don't need, and let the Mac charge on a desk rather than a cushion.