Termostatka qurxinta chillaaha (si loo yaqaan termostatka xadka qurxinta) waa qaybta muhiimka ah ee jiiditaanka in ay kaxaysaan dhexeeya qurxinta, iyadoo la sayidinaya tundubka evaporerka chillaah iyo qaybaha ku xigga ka badan. Wuxuu shaqeynayaa marka la raacayo timerka qurxinta iyo dhaggaartii qurxinta: marka timerku bilaabma dhaqangal qurxinta (kila 8–12 saa, oo ku sii dheer 10–30 daqiiqo), dhaggaartii wuxuu qurxinayaa qurxinta la iskudhafday tundubka evaporerka, halka termostatka qurxinta uu ilaaliyaa heerkulka tundubka. La sameeyey sensor bimetallik, wuxuu shakhsiyeeyaa macdaalaha si ay ugu qaban tahay dhaggaartii marka tundubku gaara heerkul rukun (wadariga ah 5°C ilaa 10°C)—sidaas daraaddeed tundubku ma ugu weyn karaa heerkulka iyo sabab u noqon karaa alaabta qurxinta lagu qurxineyso (refrigerator compartment). Sidoo kale, wuxuu dib u nolosan karaa marka tundubku dib u guurdo heerkul yar (-5°C ilaa 0°C), taasoo ogolaada chillaah siday ugu socotaa hore. Aragnimadaha muhiimka ah waxay ku baran tahay kala duwanaansho heerkulka -40°C ilaa 60°C (si ay uga fahmataan shuruudaha chillaah/freezer) iyo qiimaha la xidha dejiyaha 10A/250V (si ay uga fahmataan tirada dhaggaartii qurxinta). Kharashaha termostatka qurxinta mararka qaar ayaa abuura laba aragti: haddii uu doorto (ma leh continuity), dhaggaartii kuma aasaasno, sababiya qurxinta la iskudhafday (rabaadka qurxinta iyo blokiga hal-abbaaro); haddii uu doorto (la socda mudna), dhaggaartii wuxuu socda sanas, sababiya heerkulka ugu sarreeya (heerkulka sareeeysa chillaaha, alaabta la qurxineyso), iyo kharashka dhaggaartii. Beddelka ayaa doori kartaa in la raaco qiimaha heerkulka termostatki iyo nooca la dhisey (clip-on to the evaporator coil vs. screw-mounted) chillaah modelka (tusaale, GE, LG, Siemens). Sidaaladaha caalamiga ah oo ah CE (Iluurbo) iyo CCC (Shinaha) ayaa hubiya in ay la jirto nidaamka elektrikuuta gobolka, halka awoodaha OEM iyo baazaar-dhigga ay u adeegsan karto hawlaha caalamiga ah, ka dibadda ilaa chillaaha ganacsiga.