Something small and cheap like this would be under $500 for all 5 rooms: https://www.amazon.com/WHS-65LB1-Compact-Reversible-Refrigerator-Freezer/dp/B00MVVI1FC/ref=sr_1_3?

Freon is refrigerant, it is in the HVAC system and it won't work without it.  

On my previous property there was rarely any monthly occurrences, just the occasional refrigerator or ac service call.

Hi Everyone,It sounds like I may need to buy another refrigerator/freezer for a unit I own.

When you have to replace a refrigerator or furnace, fix a pipe or panel,  plow the driveway, cut the grass, etc... all those costs are basically the same no matter how much the property is worth.

Once you add-in the cost of utilities (especially heat), furnishings (couches, tables and chairs, beds, sheets, towels, table cloths, pots and pans and plates and silverware, napkins, toilet paper, TV's and radios, washer and dryer and refrigerator - yes, it's common for a long-term SFR not to include a washer, dryer, or refrigerator - etc, etc, etc), plowing/lawn/trash (or HOA fees), cleaning, extra repairs and maintenance (I promise that a long-term house renter takes better care and causes less wear and tear than a revolving door of vacation renters), turnover management and screening, etc, etc, you are not making any more with the vacation rental than with the long-term SFR where the tenants pay all the utilities (possibly with the exception of water/sewer), and take care of the lawn and snow, and provide their own furnishings soup to nuts.

One downside to vinyl is durability, especially when tenants move refrigerators and heavy furniture.

@Pablo Pinasco,Something to think about is that older units may require refrigerants like R-22 which are discontinued or being phased out.

Then by end of first month they said there were problems with clothes washer, refrigerator and garage door.

Just keep in mind if you are buying and holding for the long term it would be a good investment to replace a unit with the old refrigerant when you have to start charging it up regularly.