By Educating renters and then holding them accountable for the damage they do to property. Rental agreements should state the tenant must change the filter and must pay for service calls caused by filter issues.

Common and costly repairs are caused by leaving the filter out This neglected filter has collapsed and is allowing dust and dirt  into the system the same as if the filter had been removed.

When a coil is dirty enough the unit wont run without  freezing it has to be cleaned. This one is easy to get to and could be cleaned in place $ If a coil inaccessible or too dirty it must be pulled out and cleaned.$$ To pull and clean a coil entails , removing all the Freon  from the system using a torch to cut the Freon lines loose  from the air  handler. Taking apart the unit removing the coil and taking it outside to be chemically cleaned. Before  putting it all back together and recharging it it with Freon

Many older units do not have float switches to protect  against flooding If a drain line clogs up or the water can not  flow due to the vacuum caused by a very dirty filter it can cause water damage to the Property $$

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Running a unit frozen for an extended period of time  can cause the fan motor in the indoor unit to fail $$  or the compressor in the outside unit to fail $$$$

You can save the property owner a lot of money by educating renters and requiring  them to pay for  damage caused by abuse and neglect.

Property managers should be aware of the dangers and financial liabilities associated with mold and mildew

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