I got the 5 pack as I wasn't sure how many I would need. I have two in a 7 cubic foot freezer that I use for homebrewing. It is in a basement garage, and is kept anywhere from the upper 30's to mid 60's depending on the brew. Within 3 days, two of these minis had taken out all of the condensation(that had started some rust in the bottom corners) and have kept it dry. It has been over a month now and the indicators are still blue. I also have two in a 4 cubic foot kegerator and they haven't faired so well. Maybe this is because of the coils inside this fridge. It has definitely helped there too, but not as bone dry as I had hoped. Overall, I have been pleased with them.