Heat exchanger yomwe imatchedwanso makina otengera kutentha, ndi zida zomwe zimatha kusamutsa kutentha kwina kuchokera kumadzi otentha kupita kumadzi ozizira.Ndizida zofunikira kuti mukwaniritse kusinthana kwa kutentha ndi kusamutsa panthawi yopanga.Ndi evaporator kuti madzi ozizira amayenda mu chubu ndipo refrigerant imasanduka nthunzi mu chipolopolo.Ndi imodzi mwa masitaelo akuluakulu a refrigerate unit yomwe imaziziritsa refrigerant yachiwiri.Nthawi zambiri amatengera mtundu wopingasa, womwe umakhala ndi mawonekedwe a kutentha kwachangu, mawonekedwe ophatikizika, malo ang'onoang'ono otanganidwa komanso kuyika kosavuta etc.