Central air is some of the best money we've spent. Our install was around 3K, but the lines were already roughed in.
As for size - it is important that it is "right-sized" for your home. A unit too small will run constantly and still won't keep up on hot days. A unit too big will kick in and out frequently.
Some are much quieter than others. If it will be beside your deck you'll probably want a quieter one. Good luck shopping.
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