Folks- we're talking about Kodak GOLD here... that stuff was designed to basically never die - it's the zombie of 35mm roll film. Kodak engineers made it so it would produce useable images after sitting in the glove box for a year, or capturing three successive Christmases before being processed. So it would take a LOT to get it to go bad. Buy some in winter-time and store it in the furnace room over the winter, ideally next to or on top of a gas or oil furnace. I don't think an electric heat pump is going to cut it. Maybe put it in a Ziploc bag, making sure the bag is watertight, and then boil it on the stove until the pot runs dry.