What information do mechanical engineers need for heating calculations?

Mechanical engineers require window opening specifications and overhangs for heating calculations because these factors significantly influence the thermal performance of a building. The size and orientation of windows determine the amount of solar gain entering a space, which affects heating requirements. For example, large south-facing windows can allow for passive solar heating in colder months, while overhangs can provide shade during hotter months, thus reducing the demand on heating systems.

In calculating heating loads, engineers must consider how much heat is gained from sunlight versus how much heat is lost through windows and other structural components. This balance is crucial for designing an efficient heating system that maintains comfort while minimizing energy use. The other choices do not directly impact the calculations needed for heating loads in the same prominent way that window specifications and overhangs do.