Refroidir belong to the 2nd
group. Refroidir is a common french verb.
Refroidir is conjugated the same way that verbs that end in : -ir
Refroidir is conjugated with auxiliary avoir
Refroidir verb is
direct transitive, intransitive.
French verb refroidir can be conjugated in the reflexive form: Se refroidir
verb is a direct transitive verb, so passive voice can be used.