Increasing the thermal energy of a sample raises its temperature, provided that:

1. Adding heat does not always show up as a temperature rise. 2. Assuming that no chemical reaction or phase change such as melting or vaporising occurs, increasing the amount of thermal energy in a sample will cause its temperature to increase. 3. During melting or boiling the added energy goes into the phase change instead. 4. The same caveat applies in reverse when a sample is cooled. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 5 'Thermochemistry', sections 5.1-5.3_