I'm not trying to be harsh but those don't sound like compatible statements.

If a tenant is harsh on them and they break often, I'll stop fixing and supplying them for that tenant. 

I don't mean to sound harsh, but this tenant ignores you, refuses to maintaining your property (HVAC), damages your property, violated the lease by moving in another person, and you "don't want to lose her as a tenant"!

I rent as well and I don’t want to be a harsh landlord. 

The tenants still have power in the unit (i.e. other appliances and outlets are all working), but I don't want to neglect this and create a situation where a fire hazard may be present.My question is: is there any type of preventative maintenance (i.e. periodically add deox/other chemicals to support conductivity) or inspections I should be doing as landlord on the panel every so often?

I still have chemicals that can be sprayed on the shingles then pressure wash the roof and looks like new. there are many individuals in Florida that still do it.  

@Suzanne StorzMy commentary may come across as harsh, but this is something I feel quite passionate about so I apologize in advance.  

@Rob SmithAnother harsh lesson in the realities of the world.

He really tells it like it is, and while he may seem harsh, he doesn't have much hassle in his rentals. 

Didn't mean to be harsh or insult you.