Harvey is known as Premium.
I believe they have more than one line... most vinyl window manufacturers do.
The energy efficiency would depend on the glass package chosen. So that can vary, even in the same line.
The durability/warranty is usually very high compared to industry standards.
And aesthetic appearance can vary greatly based on what your preference is.
Luxury vinyl goes a bit further with greater options and sizes... but isn't necessary for everyone. I only know a few customers that have chosen the multicolor options and such that these provide... but have some customers that have chose them due to the size of clear glass that they wanted.
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