For small spaces, you can't get a small enough (in terms of BTU) multi-zone unit and what happens is one unit receives refrigerant even when not running if the other is running, which due to the cold of the evap coil causes it to condensate and ultimately causes constant problems with drainage.Also, look for a mini-split where you can connect an external thermostat and configure the head unit to shut off when the set point is reached.

I once ran a restaurant in Malibu which had been in business for 25+ years and often an older piece of refrigeration or cooking equipment would have the Model info rubbed away over time from scrapping against the wall. 

If you give me $200,000 cash I will gladly and faithfully hand deliver you a couple hundred bucks a month and I'll never call you to fix a toilet seat, refrigerator, or anything ever.

Plus, you have 4x the systems to maintain: 4 HVACs, 4 water heaters, 4 refrigerators, etc.Skips and evictions.

We have had people burn a large portion of a living room rug, smash televisions, allow a pet to chew up a dresser in our pet free home, and puncture holes on the inside of the refrigerator.

We buy many refrigerators new from Lowes and get free delivery.

In the span of 6 months, I had to replace the AC unit, water heater, and refrigerator.   

Duct is maybe not the right word exactly because they just cover the refrigerant line.

Appliances included are a refrigerator, stove, dishwasher and microwave.

If they say that they were told the refrigerator worked and it didn't they would have to prove it and state an amount they were damaged.