[sammyg2]

Years ago my house has original single pane aluminium sliders. Drafty as heck.

Me, being a cheap SOB, went to the home despot and ordered a bunch of retro-fit replacemet aluminium dual pane windows, average cost was around $175 each.
Took a whole afternoon to install them myself.

Then I bought a new vinyl 8' double-pane slider, prolly should have farmed that one out cause it was a struggle to do that myself, but I got it done in one day for $850. that thing was heavy!

I had 4 of those loovered "motor home" type of windows near the front entrance, bout 3' wide and 8' tall. Bought some box section double pane 6 over 6 windows for about $200 each. That took a whole day to install them because of the framing and mouldings etc.

Bottom line is I upgraded every window in my house (except for the one in the master bath) for less than the price of one of them top of the line fancy windows.

Now iffn I lived in Alaska or Wisconsin I might need the argon filled, fancy triple pane stuff but in So Cal what I got is more than good enough and it makes the house a whole lot more comfortable and quiet.