The condenser coils dissipate heat to ensure complete cooling in the unit. As a result, you may feel heat dispersing from behind and under your Whirlpool refrigerator. However, if the amount of heat is getting too harsh to handle, you can either clean the coils, change the air filter, or check the evaporator fan motor. Basically, regular maintenance of the refrigerator should help in temperature control, thereby reducing the amount of external heat.