I am looking for a software for calculating the heat load of the cabin of an overhead crane in a Steel Plant wherein the cabin is constructed of steel plates and glass panes and the walls, floor and ceiling are internally insulated. The ambient temperature is any thing between 60 Deg. C to 80 Deg.C. Could some suggest some thing suitable and where to get it. I have tried but the only softwares available are for HVAC. For this specific requirement the only thing that I could get is a chart from one of the manufacturers of the A/C system for such applications, wherein the load is specified.