A control unit supplies {HEAD ~ electricity} to {TAIL ~ the thermoelectric device} such that the first surface absorbs heat in a cooling mode and the second surface absorbs heat in a heating mode 
to
A control unit supplies { HEAD ~ electricity } to { TAIL ~ the thermoelectric device } such that the first surface absorbs heat in a cooling mode and the second surface absorbs heat in a heating mode
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH