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