Apparatuses, methods, kits, and systems relating to transferring electromagnetic energy to an energy application zone via a source of electromagnetic energy are disclosed. Some apparatuses may include a processor configured to determine a preliminary amount of energy to be dissipated in an object located at least partially in the energy application zone and determine a corrected amount of energy based on the preliminary amount of energy and calibration information. The processor may be further configured to estimate an amount of energy dissipated in the object. The processor may also be configured to cause the source to transfer energy to the energy application zone at least until the energy dissipated in the object as estimated equals the corrected amount of energy.