Humi problems in AZ

I'm pretty new to all of this also but I'll ask a question anyway. How long has been since the hygo was reading 75%. If its been awhile (a couple of hours) you may have a seal problem with your humidor. It just seems to me your readings may be mimicing the relative humidity in your room.

As for beetles see this thread

I find that the siren and warning lights should start going off when you near 80/80 that is when the unreperable damage can come.

Tey, those are some pretty high numbers. I tend to start worring about beetles hatching at around 74 degrees. I like keeping my humidity way below your numbers just because the cigars smoke better. As the temp goes up your humidity will also follow. Bring your temp down and the humidity will come down as well. Without having a clue as to what your set up is, it's hard to make suggestions. First off, I'd try and find a cool spot in the house. Basement would be great, or the back of a closet on the North side of a house. Cranking up the a/c helps but can get spending over the coarse of the year. I've also used ice bottles or the blue ice cooler jobs in my coolerdor in the hieght of the hot season here In New Mexico. That gets labor intensive but my hot season is maybe a month, compared to your year. Would seem that your best solutions would be to use a wine cooler as your humidor. That way you can control temps with a thermastat. Coleman makes a nice little electric cooler/fridge that a buddy of mine has converted to a humidor. You need something that can maintain a temp in the 70 degree area without over cooling. Too much refridgeration dries out your cigars. No real answers there just some things to think about when trying to make you decision what will work best for you.