Provides dynamic temperature simulation of 1 to 25 room buildings, shelters, and cabinets over the course of 20 days. Useful for accommodating heat dissipating equipment and/or people. Handles refrigerated cooling, direct and indirect evaporative cooling, heating and outside air ventilation. Cooling and heating or power plant failure, partial or total, and later restoration can be simulated. Includes indicative external bush/forest fire mode. Provides for sensitivity analysis of selected parameters utilizing monte carlo techniques. Handles adjacent spaces that are not ‘traditional’ rooms. The refrigeration equipment model can be modified. Relative humidity estimation per room is provided. Building fabric cooling and heating loads, separate from the total loads, are tabulated.