Warehouses, such as the one I work in, have huge cargo bays that are almost always open to receive the back ends of incoming tractor trailer rigs. When these ba

Warehouses, such as the one I work in, have huge cargo bays that are almost always open to receive the back ends of incoming tractor trailer rigs. When these bays are open it is virtually impossible to control the temperature inside the warehouse artificially When I worked in a warehouse in a northern state, they kept the bay doors closed when there was no truck there, and even when the doors were open, they were covered by strip curtains to help keep the heat in. Even when it was below freezing outside, it was warm enough inside the warehouse to walk around in an insulated shirt and no jacket (~50 degrees inside, ~20 (or less) outside). Of course, they didn't do it for the employees, we dealt with a lot of food products that couldn't be allowed to freeze. So climate control even in a warehouse is possible, but maybe not cheap in 95+ degree Sacramento summer days.