Industrial heat treatment of aluminium alloys has long lacked a practical way to track microstructural evolution in real time. Conventional in-situ methods are limited by complexity and cost due to the need for dedicated sensors. In this lecture, we present whole-furnace calorimetry (WFC): a simple yet powerful approach that adapts the principle of power-compensated differential scanning calorimetry (DSC) to the industrial scale. By analyzing the power intake of a convection furnace, phase transformations in aluminium wrought alloys can be observed without the installation of any additional sensors. This sensorless strategy opens new perspectives for anomaly detection and microstructure-informed process optimization.