Fridges in stores typically have the condensor coils (the bit that gets hot) placed outdoors. That's why they're expensive to install and can't be moved around by the store staff.

If home refrigerators did the same, it would reduce your electric bill quite a lot, especially in places where A/C is used.

Sounds like an interesting idea for reducing energy consumption. Homes already have air ducts for washers/driers. Why can't be something for fridges too? Home fridges are almost never moved anyway.

I suspect the gain in efficiency is not too compelling compared to the increased up-front costs.