ðə hˈiːt ɛkstʃˈeɪndʒɚz mˈeɪ biː dˈæmɪdʒd baɪ kɚɹˈoʊʒən ɔːɹ mˈɛɾəl fɐtˈiːɡ fɹʌm mˈɛni hˈiːɾɪŋ ænd kˈuːlɪŋ sˈaɪkəlz.
The heat exchangers may be damaged by corrosion or metal fatigue from many heating and cooling cycles.