What is typically used to measure heat in a building?

The measurement of heat in a building is most commonly done using thermometers. These devices are specifically designed to gauge temperature, which is a direct indication of heat levels in a space. Thermometers can be used in various forms, including digital, liquid-filled, or infrared types, making them versatile and effective for assessing thermal conditions within a home or any structure.

Other instruments mentioned serve different purposes. Barometers measure atmospheric pressure and are not used for temperature readings. Hydrometers are used to measure the density of liquids and consequently do not apply to measuring heat in a building. Hygrometers measure humidity levels in the air, which, while related to comfort in a building, do not provide direct information about temperature or heat. Thus, the use of thermometers is the only appropriate choice for measuring heat in a building context.