About this matter you can find a lot of very good article in books and the internet. So I will try to make it as short as possible, respectively focus on the thing I believe is important.
Bottom line for me is, storing your cigars at a perfect humidity and temperature is a little too over rated in my opinion. Cigars, especially in left in their original containment, the cigar box, are much tougher than we really give them credit for. Yes it has to be humid, yes the temperature has an effect and yes quick changes in humidity or temperature damage the cigar. But 70% humidity with a stable temperature at all times is a myth that still holds true and seems to make a lot of noise.
In the beginning of my smoking career I remember checking my desktop humidor on a daily base. Back then temperature was not even in my focus but if the humidity moved for just one percent up or down I did the impossible and the humidor had to undergo different procedures to increase or lose a little of the humidity.
After a while my humidors grew in size and after a few years I noticed that even though the humidity moves a few percentage the cigars smoke and taste just fine. That gave me the confidence that it is not necessary to worry too much about deviations and the hygrometer is to be checked for the trend it indicates and not the exact figure displayed. So I guess you just have to keep your coolness about this.
But speaking of coolness there is another aspect which is very important to me. I cannot scientifically prove it nor am I able to explain it to well but if given the choice and possibility I like my cigars to be stored at a cooler room temperature. I like to think best is between 12 to 16 degrees and this is because I feel that cigars smoked out of a cooler containment taste better. Hidden and faint notes come thru or are intensified. I noticed this effect for the first time when back in 2006 I smoked thru a dressbox of Romeo y Julietta Exibicion No. 4. Some of them were stored in a humidor down in the basement and some of the cigars where in a “go to” humidor in the living room. The later obviously were held at a few degrees more and tasted bland(er) and less expressive. All the cigars smoked out of the basements humidor had a rich honeydew undertone and were more complex. After smoking a few I moved all of the cigars into the basements humidor, waited one or two month and all of them were very enjoyable. I know, not really scientific and it might as well all be a coincidence. But after this experience I started to store all my cigars at a temperature lower than room temperature. But again this is just me and if you do not have the possibility to do so, don’t sweat it. Keep your coolness. 🙂
By the way you do not always have to have a perfect Spanish cedar humidor to store your cigars. Based on my own experience and what I have learned from the smokers around me it is totally sufficient to store your cigars in simple boxes/cases somewhere in the cellar or a “unused” room and as long as the box is full you do not even need additional humidity devices. It usually levels out on a humidity level that is perfect for long term storage. That being around 60% to avoid fungus.