The ambient temperature differential between the kitchen and other rooms in a house is minimal on average. There’s nothing bonkers about putting the refrigerator in that space. Even a hypothetical 20F temperature rise during an hour long cooking session is basically negligible for the efficiency of a refrigerator that is cooling 24/7.
Putting the refrigerator in an unconditioned space wouldn’t be as big of a win as you think because every time you open the door to the unconditioned space you’re letting cold air into the house. Twice per refrigerator visit all day long adds up.
In the winter you actually benefit from having the refrigerator in your conditioned space because the waste heat goes toward heating your house. It would be lose-lose to put it outside of the house in a cold location.
Putting the refrigerator in an unconditioned space wouldn’t be as big of a win as you think because every time you open the door to the unconditioned space you’re letting cold air into the house. Twice per refrigerator visit all day long adds up.
In the winter you actually benefit from having the refrigerator in your conditioned space because the waste heat goes toward heating your house. It would be lose-lose to put it outside of the house in a cold location.