The control unit may also control a fan provided at the heat sink, such that {HEAD ~ the fan} cools {TAIL ~ the heat sink} more in the cooling mode than in the heating mode 
cools
The control unit may also control a fan provided at the heat sink , such that { HEAD ~ the fan } cools { TAIL ~ the heat sink } more in the cooling mode than in the heating mode
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH