Guides

Why Macs get hot, and how to keep them cool, including while AI agents do the work.

Mac heat basics

• Why is my Mac getting so hot?
  Your MacBook is hot because something is using the CPU or GPU hard. The 10 most common causes, how to find which one it is, and how to fix each.
• How to cool down a hot Mac: 12 ways that work
  Practical ways to reduce heat on a MacBook Air, MacBook Pro or iMac: find the hot app, fix airflow, Low Power Mode, efficiency cores and more.
• How to keep a Mac cool during heavy work
  Video exports, 3D renders, builds, Docker, games and local AI: how to keep a MacBook cool and fast during long, heavy workloads.
• What is a normal Mac CPU temperature?
  Normal temperature ranges for Apple Silicon Macs (M1 to M5) at idle, everyday use and full load, when to worry, and how to check yours.
• Mac hot when you're doing nothing? Find the hidden process
  Your Mac is hot or the fan is running while it sits idle. How to find the background process responsible and what to do about each one.
• kernel_task using high CPU on your Mac: what it means
  kernel_task at 300% CPU is usually macOS protecting your Mac from heat, not the cause of it. What it is, why it spikes, and how to fix the real cause.
• Mac fan loud? Why it happens and how to quiet it
  Why your MacBook Pro, iMac or Mac Studio fan is running loud, which apps cause it, and how to quiet it without risky fan-control hacks.
• MacBook hot while charging: normal or a problem?
  Why a MacBook gets warm while charging, how hot is too hot, and how to keep the battery and the Mac cooler when you work plugged in.
• Do laptop cooling pads work for a MacBook?
  Cooling pads, stands and fans for MacBook Air and Pro: what actually lowers the temperature, what doesn't, and what to do instead.
• Chrome making your Mac hot? How to fix it
  Why Google Chrome heats up a MacBook, how to find the tab or extension responsible, and the settings that cut its CPU use.
• Mac hot after a macOS update? Why, and how long it lasts
  A Mac often runs hot and drains its battery for a day or two after a macOS update. What it is doing, how long it takes, and when to worry.
• WindowServer using high CPU on your Mac: what it is and how to fix it
  WindowServer draws everything on your Mac's screen. Why it uses lots of CPU with external displays, many windows or effects, and how to bring it down.
• MacBook hot with an external monitor? How to fix it
  Why a MacBook runs warmer with one or more external displays, how scaled resolutions and charging through the monitor add heat, and what helps.
• Docker making your Mac hot? How to cool it down
  Docker Desktop runs a Linux VM that can heat a MacBook. Limit its CPUs, use Resource Saver, use arm64 images and stop idle containers.
• Zoom, Teams or Google Meet making your Mac hot? How to fix it
  Video calls heat a MacBook because of camera encoding, background effects and screen sharing. The settings in Zoom, Teams, Meet and macOS that cut heat.
• MacBook Air getting hot? What's normal and what to do
  The MacBook Air has no fan, so it gets warm and slows down under load. What's normal on M1 to M5 Airs, what isn't, and how to keep it cooler.

AI agents and heavy dev work

• Why your Mac overheats when AI coding agents run
  AI coding agents like Claude Code, Codex CLI and Cursor spawn builds, tests and dev servers that max out your CPU. Here is why a MacBook gets hot, how to find the culprit, and how to cool it.
• How to check your Mac's temperature on Apple Silicon
  macOS has no built-in temperature display. Here are the ways to check CPU temperature and thermal pressure on M1 to M5 Macs, from Terminal commands to apps.
• How to cool down a Mac without stopping your work
  Run heavy processes on your Mac's efficiency cores to cut heat and fan noise while builds, renders and AI agents keep running. Terminal method and one-click app.
• WhoIsCooking vs Activity Monitor, iStat Menus and Stats
  Compare WhoIsCooking with Activity Monitor, iStat Menus and Stats for Mac temperature and CPU monitoring when running AI coding agents. What each does best.
• Codex turning your MacBook into a furnace: how to fix it
  Codex CLI runs builds, tests and scripts that keep every core busy and heat up M1 to M5 MacBooks. Find which Codex session is the cause and cool the Mac without stopping it.
• Cursor overheating your MacBook: causes and fixes
  Cursor can make a MacBook Air or Pro hot through indexing, extensions, language servers and agent runs. How to find the cause and cool the Mac while you keep working.
• MacBook hot but the fan is not spinning: why
  Your M-series MacBook Pro feels hot but the fan stays quiet. Why Apple Silicon fan curves wait so long, what is normal, and how to cool it earlier.
• Running parallel AI agents on a Mac without overheating
  Several Claude Code, Codex or Cursor agents at once can overload a MacBook until it throttles, freezes or shuts down. How to cap the load and keep every agent running.
• How to avoid MacBook Air throttling on long tasks
  The fanless MacBook Air slows down under sustained load. How thermal throttling works, how to check it, and how to keep long builds, renders and AI agent runs faster for longer.