A heating or cooling element is disposed within the housing proximate {HEAD ~ the cavity} to heat or cool {TAIL ~ the cavity} 
A heating or cooling element is disposed within the housing proximate { HEAD ~ the cavity } to heat or cool { TAIL ~ the cavity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL