Yap that too, but the temperature didn't change all that much... I mean we were in the mid 70's up in NY - windows open, and mid 70's in FL, windows closed AC on.
One thing that got me going NUTS was how my Ovation was going sharp on me after I got it. I never had that happen before with a guitar. What it was.... as it turned out... is I recieved it in February, and here in Fl at that time of year, we're AC off. Its our dry season, but still higher humidity than AC usage allows. Good reason for a humidifier in your acoustic case, if you live in the AC world.