We got a new slider when we had our windows replaced. The old one was a 1970's model that was basically just a big old money leak in the side of my house. The newer ones offered by window replacement companies are much better these days. You might check w/them.
In our nearby big-city there are all kinds of variance in pricing on window/door replacements. There are premium brands w/big $ticket prices all the way down. We found a happy medium and got ours installed. My living room is much warmer these days!
I wanted the French doors but as the man explained it there is much more opportunity for leakage with one of those than a slider.
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