We fixed air conditioners (very important in Texas), dishwashers, and plumbing issues.  

I never saw an air conditioner cage until I went out east..

A Multi Family unit I bought in a more transitional neighborhood ( near a church and school ) cost me someMoney early on because someone tried to steal the air conditioner for copper scrap.They didNot get AC but did some damage and the repairs hurt my return rate .

Electric baseboard is always 1:1.On top of that the unit provides air conditioning in the summer with a SEER rating of 30, which is more efficient than the through-wall air conditioner it is displacing.

An anti air conditioner

My husband and I gave them 2 window air conditioners to use as long as they live in the house.

The weather here is an air conditioners enemy.Depending on the filter, they should be changed every 30-90 days.  

The key is ensuring you run them like a business and have a way for tenants to request service in their units and also ensure they have clarity on what things they are responsible for (e.g. air conditioner filters, light bulbs, etc.).  

The Seller Warranties Section of the AAR Residential Resale Real Estate Purchase Contract requires that all heating, cooling, mechanical, plumbing and electrical systems (including swimming pool and/or spa, motors, filter systems, cleaning systems and heaters, if any) be in working condition.Warrantedleaking faucetleaking landscape featuresoutdoor sprinkler leakleaking tub diverter valveair conditioner below manufacturers specs on splitswindows don’t open/don’t stay up/don’t lockmalfunctioning pool lightnon-working GFI outletceiling fan will not operatewater osmosis system not functioningNon-Warrantedstructural pool leaksloose or rocking toiletungrounded outletsmissing GFI outlethot and cold water outlets reversedcracked windowsmall hole in windowvacuum seal leaking on dual pane windowsmissing or non-working light bulbsroof leaksQuestions?

It was a win-win all the way around.I just got a really good deal from a tenant who didn't want to move a leather couch, matching leather chair, flat screen type television stand, microwave, vacuum cleaner, 2 window air conditioners, kitchen table with 4 chairs, coffee table, and end table... all for $200 cash + $100 towards extra cleaning services to get his apartment back in shape.