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You'll have to make sure your unit is being enough to add additional ducts. If it is, you are good. My house is 1700 sq feet with a 3 ton unit. I would like to add one vent in my den, but i would have to go up a size to do that. Thankfully, its the family business so everything is at cost for me.
How many sq feet is your home, including your basement? What is your current unit size?
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