Several points to review - I am not an expert re: this, just giving what I hope is an informed opinion.
I got the tax bills too. They are for the period of interim occupancy. It was in your sales agreement. The phantom mortgage (rent) does not pay that.
The bedrooms are wired to code. There is a 15 Amp service. The problem with hair dryers, vacuums, curling irons and the like is that they draw a lot of amperage. If you go over 15 Amps on the circuit, the breaker trips. This is all done to the electrical code.
It does not sound like a lot of usage, but I can have my 3 computers, two monitors, stereo, printer, overhead light, gaming laptop and other sundry equipment on at the same time. They draw less than 15 Amps.
I have tripped my circuits by plugging in a small Samsung canister vacuum. My baby vacuum takes 10 Amps, so that means if there is more than 5 Amps load on the circuit already, the breaker will trip. Larger vacuums will probably take more Amps than mine. If you have a large upright one, it's almost a guarantee it's very close to 15 Amps. General rule of thumb, anything with a motor uses a lot of Amps.
The GFI outlets in your kitchen and bathroom are on a separate circuit and will be better to use for those devices like vacuums, hair dryers etc. This is also the reason that the fridge has it's own circuit. There's also an outlet off of the stove that you can use without worrying about tripping the main circuits. I have a outdoor-rated extension cord that makes this easy to do. It also lets me run around further with the vacuum before I need to find the next outlet to jump to.
The power did go off yesterday in the building for what looks like a very brief period. That happens on rare occasions. If you have sensitive electrical equipment or equipment that must stay running, you may want to consider a battery backup.
Your Tarion warranty is not over. The unit is still covered. The coverage changes after the first year of occupancy, but you are still covered for defects in workmanship. Read the warranty brochures, it explains it.
Hope this helps.
SweetSuite