Sure, the Wi-Fi performance is worse, and by design. Apart from the initial issues that they have fixed, it specifically has lower EIRP and fewer chains.

I actually don't use the Wi-Fi on my hAP ac2. I have it enabled for worst-case management connections only; but I feed multiple RB962 (hAP ac) into it to serve the premise Wi-Fi.

But the wireless performance is a completely separate topic than the heat.

It doesn't matter how hot it feels. The hardware can handle it and will work fine.

In my case it does matter.
My router is sitting by the window and would stop working when under sun light.
I drilled the holes to help cooling. Will see how it goes.

you have a black router under direct sunlight? well... no wonder it gets hot.

Instead of drilling holes, even simple piece of white paper would help more

Looks like the holes helped
I think paper would not help THAT much
Anyway, the point here is that the temperature on the contrary DOES matter and the hardware can not handle very hot temperatures as was claimed above.

Nobody ever claimed that temperature does not matter.
Temperature does matter and it is stated in the specs: "Tested ambient temperature -40°C to 50°C" That means, it is guaranteed to work, as long as the temperature around the router does not go over 50°C. By putting it on direct sunlight you violated this condition, because there was additional directly applied heat (sunlight hitting black surface).

Drilled holes increase airflow, therefore decrease the temperature - obviously that helps, but it is unnecessary as long as you keep the ambient temperature in specified range.

1. Normis from Microtik support in post #7 says "it does not matter"
2. It was not DIRECT sunlight. two glass window was in between
3. Direct sunlight does not increase AMBIENT temperature

1. Normis from Microtik support in post #7 says "it does not matter"
2. It was not DIRECT sunlight. two glass window was in between
3. Direct sunlight does not increase AMBIENT temperature

1) It doesn't. Well, up until 50 celsius.
2) This is the definition of "direct sunlight".
3) Of course it does. It heats the case, that in turn heats the air inside. Your room may not be at 50 degrees, but certainly the air inside the router was. "Ambient temperature", in the manual context, does not equals to "room temperature". It equals to "temperature of the air surrounding the electronics". Since You decided to cook it on direct sunlight, the temperature limits were exceeded.

I have one of these units. It survived the Rio de Janeiro summer (37 positive celsius on the shade). I just didn't put it to cook on the sun.

The specs says "Operation temperature -40..50"
My understanding it is not the temperature inside next to the chip, it's the air temperature outside the unit.
The room temperature was 25 when it stopped working. I doubt sunlight through a window made it over 50.
Maybe my router is just faulty, but it does not stand up to the claimed specs.
I see this as a design mistake, the case is just too small, they seem to fix that in hap ac3

What makes you think the 25C degree temperature was the cause? It could have been any number of things, a power issue or a manufacturing issue (warranty case).

The specs says "Operation temperature -40..50"
My understanding it is not the temperature inside next to the chip, it's the air temperature outside the unit.
The room temperature was 25 when it stopped working. I doubt sunlight through a window made it over 50.
Maybe my router is just faulty, but it does not stand up to the claimed specs.
I see this as a design mistake, the case is just too small, they seem to fix that in hap ac3

Well, Your understanding is wrong. In this context (for ANY product) what count is the temperature of the air surrounding the device. It really doesn't matter if the room is at 19C, if you just put the poor router inside the chimney, with the fire roaring.

I can't say if sunlight through the window made it above 50, and your unit may well be faulty. What I can say is that the sun it didn't help it.

Do the test:
Put it on the sun, and see if it locks up.
Stick a sheet of paper on the window, to shade the unit. See if it locks up.

After this simple tests we will be able to say it the sun is affecting it. But one thing I guarantee you: my unit worked flawless with ambient temperature above 34C. I didn't test the 50C mark, but I saw it working above 34C ambient. And I mean the room was above 34C. The unit was on the shade, though.

It started when I moved it by the window.
It was locking up when under sun light (coincidence?)
After 2nd lock up I drilled the holes and it never happened again.
These simple events make me think the overheating was the issue.

It started when I moved it by the window.
It was locking up when under sun light (coincidence?)
After 2nd lock up I drilled the holes and it never happened again.
These simple events make me think the overheating was the issue.

It probably was. I didn't care much for the color choice on this model: to me a white case would be better. But I still believe that the "50C ambient temperature" is correct. What I think happened is that the black case got warmed up by the sun, and the "ambient temperature" (the air inside the case) exceeded 50C. When You drilled the extra roles the air got better flow, and everything worked out.