What macOS already does with your fans
Temperature sensors inside your Mac turn the fans on automatically, and they run sooner and faster when the room is warm or the Mac is working hard (Apple). Apple's developer documentation describes the next steps as heat rises: at the Fair thermal state, macOS runs the fans and pauses background work that isn't needed right away; at Serious, it runs the fans at maximum and reduces performance (Apple Developer).
macOS also gives you two built-in levers, in System Settings › Battery under Energy Mode (Apple):
- Low Power Mode reduces energy use and, on macOS 15.1 or later, helps reduce fan noise on supported Macs with fans, including MacBook Pro from 2024 onward and the 2021 to 2023 models with a Max chip.
- High Power Mode lets the fans run at higher speeds. Apple says the extra cooling may allow higher performance in very intensive workloads. It's available on MacBook Pro from 2024 onward with a Pro or Max chip, the 2021 to 2023 models with a Max chip, Mac mini from 2024 with a Pro chip, and Mac Studio from 2026.
If your Mac has High Power Mode, try it before installing anything: it's Apple's own version of "run the fans harder for more performance".
What a fan control app changes
Fan control apps raise fan speed above what macOS would choose. That's the useful direction, and the safe one: iStat Menus, for example, can't lower fans below the speed the system would normally use (Bjango).
On Apple silicon there's a catch, explained in TG Pro's guide: to set fan speeds on these Macs, the app has to take over the fans completely, and while it does, macOS can't boost them on its own. That's why TG Pro's Apple silicon modes run the fans at maximum rather than offering a slider, so they can't be set too low by accident (Tunabelly Software).
What no app can do: make a busy app use less power, or cool a MacBook Air with Apple silicon, which has no fans.
When it helps
- Long, heavy jobs: video exports, 3D renders, big builds, games. Running the fans hard from the start keeps the chip cooler before macOS would ramp them up, which matters most if your Mac reaches the Serious state and slows down.
- A hot room, where the fans are already working against warm air.
- Lower temperatures for their own sake, if you'd rather hear the fans than have the case feel hot.
When it doesn't
- Noise from one busy app. Forcing the fans higher makes that worse. Find and fix the app instead; Why is my MacBook fan so loud? shows how.
- A MacBook Air with Apple silicon. No fans, nothing to control. TG Pro, for example, can still show temperatures on a fanless Mac, but fan speed changes need a Mac with fans.
- Everyday work where thermal pressure stays at Nominal. Your Mac isn't giving up any performance, so extra cooling only adds noise.
The apps, side by side
| App | How it controls fans | Safeguards | Price | Needs |
|---|---|---|---|---|
| Macs Fan Control 1.5.22 | Auto, or Custom per fan: a constant speed, or a speed tied to a temperature sensor. Pro adds saved fan presets | Restores every fan to Auto when it quits; asks for your administrator password before it first changes the fans | Free; Pro $14.95 once | macOS 10.13 or later; Intel and Apple silicon |
| TG Pro | On Apple silicon: System, Max, and Auto Max rules that boost fans when a temperature passes a threshold | Uses maximum speed rather than a slider on Apple silicon; a separate service checks that fan commands come from TG Pro | $10 once, up to 3 Macs for personal use | macOS 10.14 to 27; Intel and Apple silicon |
| iStat Menus 7.5 | Automatic, a custom fan curve, or manual sliders | Can't go below the system's speed; manual settings reset when you restart | $11.99; family $14.99; 14-day trial | macOS 13 or later (Mac App Store version: macOS 14); fan control only in the version from Bjango's website |
| Stats | Included, but its developer says fan control is in legacy mode and no longer maintained | None documented | Free, open source | macOS 12 or later |
In short: Macs Fan Control is the free way to try it, with the most direct control. TG Pro is the most cautious on Apple silicon and adds temperature alerts, logging and diagnostics. iStat Menus makes sense if you want a full menu bar monitor and fan control is a bonus. Stats is a fine monitor, but don't rely on its fan control.
Is fan control safe?
Raising fan speed is low-risk: the worst case is noise. The risk comes from the other direction. If an app holds the fans lower than macOS wants, or takes over and then fails to react to heat, your Mac runs hotter, and macOS steps in by reducing performance. CrystalIDEA's own FAQ says that high kernel_task CPU while using Macs Fan Control usually means the custom fan settings aren't right, and suggests going back to Auto (CrystalIDEA).
Before you install one, know how to hand control back:
- Macs Fan Control restores Auto when you quit it.
- TG Pro returns control to macOS when you choose its System mode.
- iStat Menus' Automatic setting leaves the fans to macOS, and manual speeds don't survive a restart.
These apps change fan speeds through a separate helper or service rather than the app itself; Macs Fan Control, for example, asks for your administrator password the first time. It's also why the Mac App Store version of iStat Menus can't control fans, and why Macs Fan Control isn't on the App Store: its developer says that kind of low-level hardware access isn't allowed there.
Monitor first, control second
Before you decide, watch what your Mac does under your real work. Check thermal pressure during a long export or a game: if it stays at Nominal or Fair, a fan app won't buy you anything. If it regularly reaches Serious, extra cooling may help. How to check your Mac's temperature shows how to read it, and Why is my MacBook so hot? covers the causes worth fixing first.
Where Tend fits
Tend reads the fans and never controls them, by design. With Tend Pro, the Thermals page shows each fan's speed against its minimum and maximum, every temperature sensor, and the thermal pressure macOS reports, so you can see whether the fans are near their limit before you reach for a control app. If you do want control, the apps above are the ones to look at.
Questions
Is Macs Fan Control safe?
Raising fan speeds is low-risk, and Macs Fan Control restores every fan to Auto when it quits. It asks for your administrator password before it first changes the fans. Its developer notes that high kernel_task CPU usually means your custom settings aren't right, so switch back to Auto if you see that.
Does Macs Fan Control work on M1, M2, M3 and M4 Macs?
Yes. CrystalIDEA says it works on all Macs, Intel and Apple silicon. On a MacBook Air with Apple silicon there are no fans to control, so it can only show temperatures there.
Can I turn my MacBook's fans up manually without an app?
There's no fan speed setting in macOS. On supported MacBook Pro models, High Power Mode in System Settings › Battery lets the fans run at higher speeds, which Apple says may allow higher performance in very intensive work.
Will running fans faster wear them out?
Neither Apple nor the app developers publish fan lifespan figures, so there's no reliable answer. Faster fans mean more noise and more time at high speed. If you only need extra cooling during heavy jobs, use rules or presets for those times and leave the fans on automatic otherwise.
Can a fan control app cool a MacBook Air?
Not one with Apple silicon: it has no fans. Apps such as TG Pro can still show its temperatures. To keep a fanless Air cooler, reduce the load and use it on a hard surface in a cool room.
Related guides
Why is my MacBook fan so loud?
Find the load behind the noise first.
How to check your Mac's temperature
Thermal pressure, Terminal and sensor apps.
Why is my MacBook so hot?
Causes and fixes, from Apple's own guidance.
Tend vs iStat Menus
A monitor that reads the fans next to one that controls them.
Sources
- Apple, About fans and fan noise in your Apple product and Keep your Mac laptop within acceptable operating temperatures
- Apple, About Power Modes on your Mac
- Apple Developer, ProcessInfo.ThermalState
- CrystalIDEA, Macs Fan Control, pricing, download and FAQ, checked 13 October 2026
- Tunabelly Software, TG Pro and the TG Pro user guide, checked 13 October 2026
- Bjango, iStat Menus fans help, Mac App Store version differences and iStat Menus, checked 13 October 2026
- Stats on GitHub, checked 13 October 2026
- Apple, MacBook Air (fanless design)
Watch your fans before you take them over
Tend is free to download. Pro is $1.99 a month, $12.99 a year with a 7-day free trial, or $29.99 once.