Qaybooyinka bimetal ee fridgalka waa qaybooyinka qaar ka mid ah oo leeyahay xajmaha oo leh laba nooc oo joogto ah oo leh isku midkaal ee gaaban (tusaale ahaa, brass iyo invar, ama copper iyo nickel-iron alloy), isticmaalka isku midkaalkooda kala duwan ee si toos ah u yeela qaabka mekaaniska oo lagu dhaqaaqayo abuurista iyo awoodda fridgalka. Tusaale gaaban ee loo isticmaalo waa thermostats mekaaniska (labada cooling iyo defrost cycles) iyo door seal heaters. Cooling thermostats, bimetal strip coil ah lagaa soo bandhigayaa dhexdooda ee fridgalka: marka dhexdooda ee fridgalka kor ugu yar, stripka waxaa ku laabaa (nooca kale oo ay ku laabtaan wax badan), taas oo meesha laabka u dhigaya switch, kaalmo qorista; marka dhexdooda hoos ugu yar, stripka waxaa ku laabtaa, laabka meesha u dhigaya switchka, kaalmo dhexdooda. Qaabka fudud oo lagu dhaqaaqayo waa loo isticmaala miloontan ee fridgalka heerka hoose ee dunida, ugu dhalanaya 7-10 sano. Defrost thermostats, bimetal disc ka qaybtaa dhexdooda ee coilka fridgalka marka la defrost: marka coilka gaaban 5°C-10°C (barafka laabta), discka waxaa laabtaa si toos ah u dhigaya xajmaha, kaalmo heaterka defrost; marka coilka hoos ugu yar 5°C-0°C, discka waxaa laabtaa si toos ah u dhigaya xajmaha, dib u soo bandhigaya nidaamka. Bimetal sidoo kale waa loo isticmaala door seal heaters (anti-condensation heaters): bimetal stripka heerka heegan ee soo bandhigayaa dhexdooda ee door seal waxaa ku laabtaa marka dhexdooda ee qorraxa badan (tusaale ahaa, tirigeedka janna), laabta qorraxa ka soo bandhigaya door seal (kallu dhaafasho ama door seal). Xajmaha muhimka ah ee fridge bimetal waa inay laabtaan korrosion (si ay ugu dhaqaaqdaan fridgalka), thermal responsiveness (jarjarid baa dhexdooda), iyo fatigue resistance (xajmaha inay laabtaan khamriyo oo badan ee laabtaa/laabtaa). Qiimaha ugu dhalanaya waxaa la xaynayaa: bimetal layers waxaa la soo bandhigayaa tixgeliyaa ama brazing, leh heerka gaar ah (tusaale ahaa, 1:1 brass-invar) si ay ugu dhalanayaan laabtaa. Haddii thermostats elektronik ay aad ugu badnayaan, bimetal waa isku mid ah ee fridgalka iyo durba, gaar ahaa ee gobolka ee lacagta iyo awoodda waa loo tixgelinayaa (tusaale ahaa, Africa, Latin America). Qiimaha ugu dhalanaya (tusaale ahaa, ASTM B360 brass, ASTM F1684 invar) qiimaha ugu dhalanaya fridgalka dunida, bimetal waa qaybo universal ee refrigeration.