The invention provides a method of selecting one or more patient temperature regulation tools is provided. The method comprises: providing a database storing one or more properties of each of a plurality of temperature regulation tools; selecting one or more patient temperature regulation tools from the database; calculating an estimated patient heat balance taking into account one or more of the one or more properties of the selected patient temperature regulation tool(s); providing an indication of the estimated patient heat balance; and providing a visual aid illustrating the one or more selected patient temperature regulation tools regulating the temperature of a patient. The method may be used for selecting one or more patient temperature tools for a patient who is to undergo a medical procedure. Additionally or alternatively, the method may be use as an e-learning tool.