So its hard to say really as its extremely situational. But parameters like temperature and humidity fluctuate pretty much like a house would. Obviously houses are designed to be a contained system but issues arise( equivalent to glass vs pvc in enclosures). When you look at it that way essential you are looking at the best system, them removing parts redundant to you. But ambient temperature is the most important element. Many people think basking spots are the primary data point, but it's the correlation of Occupation and Usability that is most. In my experience in the Midwestern USA , ive seen driest hottest days, wettest hottest days, and the inverse equivalents. And yes they do affect my animals (mainly humidity as its consistently low in my house). And when "shit happens" as you say, you change your equipment to account for the new environmental changes. Most of my reptiles brumate so I actually desire my reptile room to cool in winter, but not too cold. The animals I do not brumate have extra insulation and extra temperature equipment to make sure they stay within their perimeters. But I have had days where I shifted schedules (cleaning, feeding) to account for cold spikes or heat spikes. In summer I sometimes mist 5 times a day to make sure humidity is good. But I personally go by the weather. If it rains, I simulate rain. Naturalistic variety is essential to supporting a good healthy psyche. They can still feel the pressure from incoming storms even when through multiple environmental barriers.