The fact that only these days Mount Athos monasteries have provided access to the Internet, should not deceive you. Science and technology are daily life for eremitic monks and the scholars will yet start to discover and explain many of the monks mysteries which they use with nimbleness.
For example have you seen a candle that burns but does not melt? Go to the Ksenofondos monastery and see them. They smell of honey and when you hold them don't be affraid that the molten resin will fall on your clothes. What is the secret? In the very thick candle-wick that the monks knit in times of solitude.
Whether you went to Mount Athos or not is irrelevant however for sure you've heard about the incredible acoustics of Athos churches. The architecture of Orthodox fanes is very neglected and underdeveloped part of the study of modern architecture. Otherwise any student who dreams of designing buildings from the student's bench would know that it is enough in some places, especially in the corners of the structure and in a certain way to embed ewers, most ordinary ewers of fluids to produce that great acoustics of the hall.
Air conditioners were not familiar to the monks, but nowhere in history has documented that one of them died from freezing or overheating. Certainly we have good reason to know that the climate of the peninsula was not friendly. The answer to the riddle, you can see in the Russian hospital in Karies, the capital of Athos, but the technology is known as "Romanian" - this is a system of pipes and a vacuum flask that retain the internal temperature of the building closest to the human physiological, which is around 25 degrees Celsius.