How do you determine the tonnage of the central air conditioning system needed for your house?

Question

Besides hiring an A/C tech, how do you know if the A/C system is adequate for the size of your house? Is there a formula?

Answer 1

Chart here
http://reviews.ebay.com/How-many-tons-do-I-need-to-cool-my-home_W0QQugidZ10000000002054384
Heating chart here
http://reviews.ebay.com/How-many-Btu-s-do-I-need-to-heat-my-home_W0QQugidZ10000000002054258
Tips for getting the right size here
http://reviews.ebay.com/Can-I-get-too-big-of-a-Heating-Air-Conditioning-System_W0QQugidZ10000000002054031

Answer 2

You go to any web site that sells air conditioners like TRANE air conditioner systems you see what measurements cover a certain square footage, then you take your square footage of your house and you divide it by that square footage and then you know how many measurements it is going to take to cool your home. There is a formula but you should be able to do the general math by back tracking what size a window unit of a particular ac system covers per square inch and work it back to a larger number for the sq footage of entire home...I hope your getting my idea. Take Care! (Believe me it works!) -Rachel.