Hello Ursella Thompson,
Absolutely no information came through with your question about... Room air-conditioners (make/model/size)...
Which is actually okay because those calculations...
immediately become quite complex
MORE BECAUSE OF THE ROOMS (& your climate) than the air conditioner.
The size of the room... height...
INSULATION.number of windows (fenestration) & doors (their relative insulation, composition & size... drapes, shutters. blinds, shades... storm doors (all kinds of considerations).
Sadly... if you are interested in a "cheap" air-conditioning solution
this is the area where the cheap immediately becomes EXPENSIVE...
I personally hate having strangers in my house... but this is and area where getting a "utility ENERGY assessment" might be a good idea...
Then when you are assured your house is as good as REASON/FUNDS will allow...
THEN get estimates from A/C Vendors...
or
Hire an actual ENGINEER to get an idea of what your air-conditioning requirements are..?
Check the internet: you will be presented with an array of sheets, formulas... magic tricks..
It is important to know it is a CRITICAL DESIGN consideration... and has its on field of ENGINEERS.
Hope this helps
http://www.bing.com/search?q=air+conditioning+calculator&src=IE-SearchBox&FORM=IENTSR&pc=EUPP_
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