Hozgarriak produktu kimikoak dira, likidoak nahiz erraz likidotzen diren gasak, eta bi elementuren arteko berotasunaren eroale gisa erabiltzen dira. Bero trukaketa hau makina termiko batean ematen da, besteak beste, hozkailutan eta girotzeko makinetan.
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Can_of_DuPont_R-134a_refrigerant.jpg/200px-Can_of_DuPont_R-134a_refrigerant.jpg)
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