I am in Texas where I think for our situation the central a/c (and it is a more powerful unit) really keeps the house cooler and for about $100.00 less on our electric bill (old large appliances really can drain the electricity).
but if you are in a cooler area and do not need to run it I think the window units are great. Surely they do not cost thousands of dollars.
People used to have a window unit in just a few rooms and hang out in them (such as kitchen area and family room) and go to the bedrooms at night with the windows opened when it was cooler. Houses were also built to facilitate this with cross ventilation windows.
In these hot summers that would not be an option for us right now but at the prices of central a/c it is great people have this as an option.
Be sure to look up how to make how it is installed as some burglars can gain access if you do not put in in a certain way. Some are installed where they can pull them out and go right in.
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