I use a 5# tank in my kegerator. When I take a full tank and put it in my fridge, by the next morning the needle will b in the red. I will serve about 12-16 kegs this way.
Gas pressure is directly affected by temperature.
Per the combined gas law "the ratio between the pressure-volume product and the temp of a system remains constant".
"If you fail to plan, then you plan to fail"