There is a lot more to it than just the square footage. To find the size and properly design the system you need a load calculation. You won't save anything by guessing and putting in the wrong size. For more info, check out the load calculation page at www.hvac-for-beginners.com. If you guess too big it will cost you more for the equipment and you won't be comfortable. If you guess too small it will run all the time and cost you more in operating as well as comfort. Also to guess you have to know the efficiency you want.
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