Which location is not suitable for mounting a thermostat?

Which location is not suitable for mounting a thermostat?

• A. Exposed to direct sunlight
• B. Near outside doors or on an exterior wall
• C. In or near the kitchen
• D. Near supply register or other sources of heat

Answer: (D)

Thermostats must sense the room’s true air temperature, not be biased by nearby heat sources. If a sensor is placed near a supply register or any other heat source, it will read air that’s warmer (or cooler) than the room’s average, which misleads the control system. In heating mode, that extra warmth can make the thermostat think the space is already warm and shut the system off too soon, leading to cold spots. In cooling mode, the nearby heat flow can again skew readings and cause inefficient cycling and uncomfortable temperatures. Other locations like direct sunlight, near exterior doors or an exterior wall, or in or near the kitchen also bias readings, but the key issue here is proximity to a heat source at the vent. To ensure accurate sensing, avoid mounting near supply registers or other heat sources, and place the thermostat on an interior wall away from drafts, direct heat, and sunlight.

Thermostats must sense the room’s true air temperature, not be biased by nearby heat sources. If a sensor is placed near a supply register or any other heat source, it will read air that’s warmer (or cooler) than the room’s average, which misleads the control system. In heating mode, that extra warmth can make the thermostat think the space is already warm and shut the system off too soon, leading to cold spots. In cooling mode, the nearby heat flow can again skew readings and cause inefficient cycling and uncomfortable temperatures. Other locations like direct sunlight, near exterior doors or an exterior wall, or in or near the kitchen also bias readings, but the key issue here is proximity to a heat source at the vent. To ensure accurate sensing, avoid mounting near supply registers or other heat sources, and place the thermostat on an interior wall away from drafts, direct heat, and sunlight.