If I had missed this excess increase in electric bill , I would end up paying excess bill?

Repairs/maintenance needed in excess of expectations2.

Usually, the excessive moisture is caused by a leak in the plumbing system underneath the floors and it is usually a hot water pipe leaking.I am a contractor and sometimes I find that the clothes dryer vent is broken somewhere and all the steam coming from the clothes as they dry is going inside the house and collecting on the cool glass windows.You can hire a contractor to look for a leak, or you can purchase a hydrometer online.

Question for buy and hold investors..After putting money aside for reserves, what do you do with excess cash from your rentals?

I would not acknowledge the renovation noise if it was not unreasonable or excessive. if it makes it easier you can tell them that you were going to raise the rent to $40 and choose to only do $20.

If she's wanting to put it in because she's using the room a lot as are her dogs causing excessive wear, I'd let her. 

There are many reasons why it could get to this point but it’ll likely sell for close to market value anyway and the owner will get the excess.

Also, most lenders will not have an appetite to lend on a park with all park owned homes, so keep that in mind. 

If on the other hand you don't mind them staying for a couple of weeks( seems excessive a week would be better) then withhold enough money in escrow that they don't get until you do the final walkthrough.

If we spend everything we make, we're not building up excess capital to invest with.