I started out using pdz for my chicken coop and run to decrease odors and moisture in bedding about 3 years ago. The last two winters I used it very sparingly because of cost. That first winter was very warm in the coop! I used to tell my husband it was warmer in the coop than our house. However since then it has been very cold and difficult to keep above freezing. Well, I kept trying to figure out what was different and the only thing I could think was that I covered the floor with pdz about an inch at least.
A few months ago I read an article on zeolite and found it a very interesting mineral that stores heat indefinately and releases it when water is added. It can be reheated and released again. Anyways, I found that pdz has this mineral in it! Then I wondered how that worked in my coop. Well, I figure the chickens urinated and the waterers spilled out on it after the sun heated it. Then it release the heat! Mind you I dont want my coop warmer than my house but I would like no frozen water! And maybe some warmth. At least 35-45 F degrees would be my ideal temperature in winter.
So, I bought three more bags and layered it on top bedding and under waterers and especially in south sunny window. Well, all my hens are broody and only one moving around so not much going on and not noticing warmer temps so I have been purposely spilling waterers and actually adding some in front of the window. I havent checked yet this morning as it is 16 degrees here and I'm being lazy. But I am hoping my temps are above freezing in the coop!
I have put pdz in my sunny bathroom window for several hours then added water and it did get very warm but my thermometer broke and I could have been having hot flash or my husband may have upped the thermostat. Anyways, I will continue to experiment as I think this mineral has some potential.