be employed for example the order of execution may be changed and or one or more of the blocks and or interactions described may be changed eliminated sub divided or combined additionally any or all of the example method of fig4 may be carried out sequentially and or carried out in parallel by for example separate processing threads processors devices discrete logic circuits etc as used herein the term u201c tangible computer readable medium u201d is expressly defined to include any type of computer readable medium and to expressly exclude propagating signals as used herein the term u201c non transitory computer readable medium u201d is expressly defined to include any type of computer readable medium and to exclude propagating signals example tangible and or non transitory computer readable medium include a volatile and or non volatile memory a volatile and or non volatile memory device a flash memory a read only memory rom a random access memory ram a programmable rom prom an electronically programmable rom eprom and or an electronically erasable prom eeprom the method of fig4 starts with the controller 14 waiting a pre determined amount of time t start to allow the clothes dryer 10 to reach an initial equilibrium block 405 the controller 14 determines at time t start a reference temperature t o such as an ambient temperature block 410 and begins periodically determining e g measuring exhaust air temperatures using for example the example thermistor 51 block 415 example exhaust air temperatures 105 110 and 115 are shown in fig1 for 1 kg 4.