We have an elderly tenant (Veteran) who was diagnosed with Lou Gehrigs.

Once the issue is professionally diagnosed, then you can assign the fixing of it to the proper party.Regarding your comment about the cost of the pine trees being cut down not being accounted for into the rent.

The contractor I hired one of his employees got shot and killed then the contractor himself got diagnosed with terminal cancer.

My girlfriend of 6 years was diagnosed with stage 2 ovarian cancer.

At some point probably doctors no longer diagnose or prescribe for example....when will that be? 

If you are not using electric heat then you do not need 200A service (ours have natural gas for heat, stove and hot water).I recommend you get a licensed electrician to diagnose the problem.

Quote from @Ana Vhan: Go to YouTube and search "air conditioner troubleshooting" and you will find ton of videos that show you how to diagnose yourself, as well as preventative maintenance tips.

Yeah you can probably find the part at a wholesale AC supply and change it yourself but at what price.This is based on my experiences with several AC repairs I did myself.1. 30 mins to 1 hr researching ( self diagnosing) the part online, calling to find who has it in stock2. 1 hr round trip to buy the part3. 1 hr of sweating in the sun or baking in the attic while disassembling the unit.4. 30 mins to install and test the system. ( hopefully I was correct with he diagnosis from step 1or else we start all over)5. 30 more minutes of sweating and baking to reassemble everything.So if the part was $60 and an AC company charges $140 I saved $80.

For example, if the tenants say the heater is struggling to heat the house, our maintenance guy can show up to diagnose and change the filter (which is the most common cause).

Google to diagnose their illness instead of an actual doctor?