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Originally Posted by jnieman
We had our 15x20 lanai enclosed 6 months ago. It added 230 sq ft of living space. I wanted to add air right away but we waited. I'm glad we did. Although the heating company told us our house AC couldn't handle the new space, they wanted to sell us the Mitsubicci unit for $2800. So far we have no issues heating or cooling the space and all we did is open the slider. We might put in some ducts from our current unit but you might want to wait and see if you really need the unit before spending the money. Once the heat turns up to 94 every day we might change our minds but so far, so good. We do have the low-E tinted windows.
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You may figure out why you needed to separate air conditioner unit when you kill your existing air conditioner unit. Opening the door after adding that much square footage is overworking your unit and will decrease its life. That's why it is highly advised to have a split system or a stand on the ground air-conditioner unit instead of opening the door and letting your existing air handler and air conditioner handle the extra square footage. When you replace your air conditioner then you can size it larger to handle the additional square footage and drop the extra ductwork in to the room. But it is your choice!