I have a property that about 2-3x/year, the tenants will end up blowing 1 of their breakers because they overloaded an electrical outlet.The issue is that the circuit breaker panel is located in the garage, which I don't provide the tenants access to (I keep it for storage and cars).

If you are talking about putting wraps on the windows, I am assuming your windows are single pane, and if so, I am going to jump to a conclusion that the house is old and poorly insulated.

Since everything is single pane plate glass, that is not to code now.  7 of 20 windows are being paid for. 

Do you know if this tests that the panel is grounded? 

Say, Low-E double pane vinyl from single pane wood?  

Current tenant has been there almost 18 months and while annoying (the sweating single pane window caused mold on her Gucci purse--yeah right.

They've been in for a few days, and I went over to tie up some loose ends, such as replacing a window pane.  

Add the financial strain that made them want to move in the first place, and they're in a bind.

One of my favorites is that I get to write off 14% of any remodeling I do to my home (the percentage of my home that my home office takes up)....and of course, I can write off 100% of anything I do to my home office itself (new double pane insulated windows and automatic blinds, for example). 

Anyway, you can do double pane tinted windows, 2x6 walls, double and spray insulation, good appliances, good hvac.