Fans? AC? No there's a far more fundamental problem.
I read an opinion piece once that postulated that if electricity suddenly stopped for extended periods we wouldn't me uncomfortable, we'd likely be dead. Before electricity the human race was somewhat disperse. Towns were littered everywhere and major towns had limited populations. As we the human species have congregated in major cities, and those cities have grown, our dependence on electricity is now total.
Water pumps? that kind of thing is supplied by backups. I would not worry about our water system in an extended nation wide blackout.
What I would worry is the ability to move. A city can grind to a halt when an intersection is out, imagine if they are all out.
What I would worry about is the ability to eat. Refrigeration is a cornerstone of our supply chain. Supermarkets couldn't function without electricity to run refrigeration, and without this food storage systems we wouldn't be able to feed the large population that has congregated away from the primary industry which feeds it. Hell I think back to the flood which occurred in my city in 2011. The local supermarkets actually ran out of bread, milk and water. The flood lasted 2 days and didn't actually cut off all of our highways. We couldn't make it 2 bloody days without panic buying, and stocking out food supplies in the city.
On that note, what I would worry about is other people. Looting, rioting and basic survival instincts. People have the intellectual capability of a turnip during a crisis situation. In the same 2011 flood I saw some lady lose it in a supermaket after buying the last 15 loaves of bread. She was told she could only have 2 loaves so she decided to throw the lot on the ground and trample it screaming "If I can't have it then nobody can!" To reiterate this was a 2 day flood. Where she intended to store 15 loaves of bread in a city with 30 degree average temperature and an 85% average humidity without it going mouldy I have no idea. Likewise the fact we stocked out of bottled water was alarming given there was nothing wrong with our taps or water supply.
The problem is not that we can't live without electricity, but rather we'll likely kill each other without electricity.