I will be contrary a little bit. Except for the risk of beetles, which as Ryan @Tombstone pointed out, is not near as prevalent as presented, higher temps is not really an issue.
Consider the tropical origin of our cigars where it around 80 nearly all year. The tobacco is aged in non-climate controlled barns, sometimes for years. Rapid fluctuations in temps will pose a greater problem. Seasonal fluctuations should be OK.
How are your cigars tasting, burning?
If you are satisfied, you can have comfort in leaving them as they are if it is reasonably stable.