To Be Chilled
To Get Cold
intransitive verb, ichidan verb
If 冷やす is "to chill something," then this would be the version where something is just chilled. You're not doing the action of chilling anything, it's just that way. You know this because if you get involved, there's always some kind of chilling error (える). So, you step back and let the fridge do its job without messing.
The reading comes from 冷やす. Know that and you know this as well.
私は冷え性で、特に足がいつも冷えています。
I’m really sensitive to the cold, especially my feet which are always cold.