Please forgive me for not being able to speak English!
Introduction page
Tested ambient temperature -40°C .. +50°C
About 60°C+ and room temperature only 20°C
Please answer
谢谢！
Tested ambient temperature -40°C .. +50°C
This means unit will work OK in room temperature +50C
About 60°C+ and room temperature only 20°C
Room temperature is 20C, and it works fine. It will work fine with higher temperatures too. You should not pay attention to the CPU temperature in this situation. CPU temperature is allowed to be high. Unit will still work ok.
However, the temperature is much higher than the previous product! Some worry it is easy to be bad!
I am now down-converting and use temperatures above 50°C
The surface temperature is 50°C+ and the core temperature is 60°C+. I am very worried that it is easy to be bad!
40nm! Small size and no cooling holes，Design flaws?
My cAP ac is also hot for me. I feels high temperature when I touch the back of the case. Now I can’t check it’s temperature because cli command /system health print do nothing. I will check it when I’ll be at home.
It doesn’t matter how hot it feels. The hardware can handle it and will work fine.
Hmm.. Not sure is this a (known?) bug or something else, but with 6.41.3 on hAP ac^2 it seems that the system/health is not printing anything:
[x@y] > system health print
[x@y] >
Also Health-page in Winbox shows only buttons, not any actual data. Not so big deal for me, but just mentioned. 
hAP ac^2 does not have a built-in temperature sensor
Dear mikro, you got an excellent 750gr3 - a classy body, a radiator on cpu, microSD … What prevented the body for hAP AC ^ 2 more and standard white? Why this wretched black body?Was it really so hard to do? Is it really difficult to do more with a radiator and a larger body? Maybe you should outwit your designers and marketers?
p.s. want me to make for you a free case for hAP AC ^ 2 in SolidWorks?
Guys…
Man said no need to worry as the hardware will handle it.I am sure they have tested this for a while before putting it in the market. If You are really annoyed about this then try to add some small radiator. However, the device comes with warranty so I wouldn’t worry about it at all…
Best Regards.
Do you believe they tested the temperature at least a bit more carefully than the wifi?
I also worry about the heating which means inefficient power consumption. Take the power consumption, deduct the radios and compare to rb750gr3…
Looked at the disassemble picture, found that the heat sink is mounted on the back and is not installed on the chip! Is this design useful?
image
https://wikidevi.com/wiki/File:MikroTik_hAP_ac2a.jpg
https://wikidevi.com/wiki/File:MikroTik_hAP_ac2.jpg
Is this design a major cause of poor cooling? 
Good hardware but poor overall package (software and hardware).
Now the logical question - was Mikrotik aware?
Are there AC2 with correct placement of the heatsink?
Will Mikrotik partners be replacing units with the mentioned “design” or the users will be forced to fix the problem by themselves.
I measured the temperature with a pyrometer without a box - 52-55 CPU, the radiator - 50-53 degrees and this without special load (I replaced thermal paste with MX-2) !!! The temperature in the room is 24-25 degrees, what will there be in the closed box? 60-65 + without load?
p.s. I will repeat - what prevented to make a normal white classic case for this device? This is essentially a future hit!
hi Keyko
You are the surface temperature, I believe that the core temperature is 70°C+
I want to know if this is a strategy for the retirement of the mikrotik plan?
Is the performance too strong? Do you need to use temperature to exercise plan retirement?
Hope MT can improve heat dissipation！
Economy “2 cents” on the body and cooling. It was possible to make a PCB more and quietly fit everything on the upper side, and below make an aluminum diffuser as in the RB951 + normal size radiator on the top side. Let it be more expensive for 10-15 $, but the user is calm and you + in karma.
i don’t think that moving the heatsink to the other side would make things different.
the CPU would be cooled more efficiently, i suppose.
but the heat is heat, it is radiated either by the cpu or by the heatsink. w/o improved ventilation the case will heat up, regardless where you place the heatsink.
on the other hand, you can cool stuff through the PCB as well. this way Mikrotik could use a flat heatsing, while on the other side they would have needed to follow the various component heights.
by the placement of heat transfer blobs i figure the heat generated by all the radios is also transferred to the heatsink.
also good to know, the heatsink has a mass, so if it gets heated up to a certain temperature, it will radiate it until the temperature difference between the environment and the heatsink disappears. there is a “buffering” effect in play. all we get from the heatsink is to collect the heat from multiple points and radiate it out more evenly on a greater surface.