To their credit, modern refrigerant systems use really high pressures, so if you do have a leak, they typically "bleed out" really fast, so some guys basically just check that it's working.  

You might want also have a "Move In/Out Checklist" of the units from walls, carpets, toilets, sink, refrigerator, etc along with pictures when they're moving and pictures when they're moving out. 

The landlord also can negotiate with prospective tenants a higher rent if they want/have a pet or two, or if they have some other need or amenity they want, such as a refrigerator, or water bed or something.

ALL the tell tale signs had been replaced; ground wires, refrigerator coils, and plumbing connections.

Small refrigerator magnet, plastic card, very thick business card, etc.

@Ashish AcharyaThank you.I understand it better now, even though HVAC is a major component of a home,it's dealt as a separate entity that depreciates, likewise I am assuming that would be the case with refrigerator, washing machine furniture etc

Didn't install washer and dryer, but did stage with a refrigerator. 

Maybe even water accumulated under a refrigerator.

An hour later, we watched as the MLS website was edited.Since the statement "Refrigerator Included" has been on the MLS for over 64 days now, our agent did not see the need to line item the refrigerator on the sales contract.We even asked for a copy of the receipt for the refrigerator, and they responded that they did not have it.

Purchase and installation of appliances, including free-standing ranges, refrigerators, washers/dryers, dishwashers and microwave ovens?