Q: Can someone tell me about Anderson's Low E4 and Smart Sun glass?

I'd like to know more about these two products. Are they two different products or can you get both together? What does the Low E4 get you? How does it compare to the competition? Same for the Smart Sun. Also, does the Smart Sun glass mean that your windows are kind of tinted or does it work some other way?

...I'm all for making our place more energy efficient. Not sure if I want tinted windows, though.

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