If you use air conditioning in the hottest states and have a large family do you have several units

Question

and does it cost a lot in the summer

Answer 1

Your question is very difficult to understand.  I'm going to ignore the bit about the hottest states for the time being.  First of all, air conditioning is used when the temperature inside a dwelling is warmer than is comfortable and opening windows and/or running fans isn't enough to effectively cool the occupants.

Air conditioning is more expensive than fans because air conditioning units use a compressor which uses more wattage than a fan.  The number of units depends on what is being used.

In some homes there is central air conditioning.  This is very similar to the way a furnace warms the house.  A single unit provides the cooling for every room in the home and you can control the temperature with both thermostats and register dampers.

Some homes don't have central units but instead have individual room units.  Sometimes this can be cheaper to run because you are only using a single unit to cool the room you are in, but if you have a bunch of units and are running them all at the same time then you are much better off with a central unit.

As for the cost it depends on where you live and how much your electricity provider charges per kilowatt hour, but in general you will see a jump in your electric bill during the hotter months of the year.

Hope this helps.

Answer 2

If the house is large, more then 4000 sq. feet you need 2, I at least have 2 for mine.    But, one unit should cool the entire house.

Answer 3

Are you refering to central A/C or the window A/C units? I will assume central A/C. If you have a two story house in Texas, you usually have two units. If you have a one story house, you usually have one unit (larger areas would require a greater efficiency unit).

I know people who have two story houses and pay $500-$600 per month keeping the temperature at 81F during the summer (outside temperature varies between 90F-100F).