When it is a real warm day out and you have no a/c it can be a absolutely poor and potentially deadly thing depending on where you live in the country… Some venues can get by with no a/c on a warm day with just a fan if you live in a gradual temperature where it does not get above 90 degrees as a warm day, and then it cools down at night.
But if you live in a venue like AZ, you will need to have some form of absolutely powerful a/c twenty four hours a day and seven nights per week or you will surely die. Because temperatures there can get up to one hundred and twenty degrees! It is seriously deadly. And separate from a/c there is no survival. I have lived in that part of the USA of america before. And it is no fun let me tell you! Even if you have the most top of the line, brand new, modern and extremely high-priced central heating and cooling system, the heat can get to be so damn poor that even the a/c out of one of those top quality systems will even not be fine enough. You will have to periodically have a portable cooling system to help cool your house & the a/c from your central heating and cooling system unit! But thankfully I do not live there anymore and in the event I have a drastic cooling system breakdown, I could get by with a fan for one single day and night. But I feel for those who can not.