There are several points:
- a critical internal temperature of the chip above which the chip stops working properly but when it cools down it starts working fine again, which may be even above 100 °C,
- a "melting" internal temperature of the chip which damages it irreversibly, which may be somewhere around 130 °C,
- temperature which shortens the life of the components, and for this one no "safe" value exists - the higher the temperature, the lower the lifespan of components, especially of electrolytic capacitors.
So below 70 °C indicated the only thing to think about is the aging, and it is a matter of economic calculation whether it makes sense to run the air conditioning or whether it will be cheaper to replace the box after, say, 5 years of operation. Somewhere in between is ensuring forced air flow without a heat pump (i.e. just a fan, no A/C).
Instead of writing novels, post /export hide-sensitive. Use find&replace in your favourite text editor to systematically replace each occurrence of any public IP address potentially identifying you by a distinctive pattern such as my.public.ip.1.