Just curious, I am doing my "winter adjustments." In the past week or so I turned the dehumidifier off, turned the furnace humidifier on. I have 3 little digital hygrometers, one for my acoustic's case, one for my Tele's case, one for the house in general. They are all the same model and I've been able to verify they are within 1-2% of each other. I keep stuff in the finished/heated basement. Amazingly I'm only at 35% humidity in the basement as soon as the temperature plunged. We have an Aprilaire unit attached to our furnace, it is keeping the upper floors in the low 40s which is just about perfect IMO. We did have one night/day the temps dropped to around 20F already, and the humidity in the house went down to the mid 30s. Before the onset of winter weather the basement was right at 45% due to having a beefy dehumidifier running with a continuous drain. I had superb stability out of both my guitars all spring/summer/fall. Anyway, seeing these 30-35% readings in the case I just got 2 of the D'addario 2-way humipak systems and installed them following the directions. One caveat, some of the packets froze in transit (ordered them online). Can this break them? They didn't leak. What I am seeing is my Acoustic (a Taylor in a Taylor case) the humidpak stabilized the humidity within 24 hours in the 40-45% range. Perfect. But my Telecaster after nearly 3 days has not budget at all. It's still at 35%. I actually brought the guitar upstairs this morning to take it out today, opened the case, and watched the humidity reading climb while the case was open! Could I have some bum humidipaks? Or something weird with the Case for the Tele? (It's a Gator ATA plastic case, pretty nice case overall) Or just something different about the way a solid body guitar responds vs an acoustic? My Tele is a MIM with a thick finish obviously. It's possible it was dry from before I bought it, but it was stored at 45% humidity for 6+ months so I wouldn't expect it to be chronically dry. (It shows no signs of being dry either.) I swapped the hygrometer out of the Tele case to check if it was the hygrometer and it's not that, the other one showed exactly the same reading.