In building diagnostics, a steady state condition refers to what?

• A. When temperatures are constant
• B. When power input is zero
• C. When humidity is stable
• D. When load is dynamic

Answer: (A)

Steady state means conditions aren’t changing over time; the system has reached a balance where inputs equal losses and there’s no net accumulation. In building diagnostics, the clearest sign is a constant indoor temperature, showing that heating/cooling and heat gains and losses have settled. The amount of power being supplied can be nonzero and still be steady, as long as the temperature remains constant. A dynamic load indicates a transient condition, not steady state. Humidity staying the same can occur in steady state, but a constant temperature is the most direct and reliable indicator.