Supplemental temperature control systems are used:

Question

Quizplus · Accepted Answer

All three options listed (A, B, and C) are valid reasons for using a supplemental temperature control system. These systems help reduce greenhouse gas emissions by eliminating the need for long periods of engine idling, which can also prevent wear and tear on the engine. In addition, they can save on diesel fuel costs by eliminating the need to idle the engine for temperature control purposes. Therefore, D is the best choice.

Supplemental Temperature Control Systems Are Used