What is the difference between Slimline and Classic replacement windows

We get a lot of questions about the these two windows. Harvey Slimline and Classic replacement windows are the most affordable high quality windows on the market. So we would like to show what is the difference between these two windows

Let’s have these windows side by side and have a closer look at them.

Harvey Slimline Replacement window

U-Value 0.30-0.27
Available in white color only 
Vinyl thickness 0.065
Non-Locking half screen
The thickness of the frame and the sash combined is 2 3/4’’
Sweep style lock white color only
One option of Grids
Maximum size 45 3/4’’ wide x 77’’ high

Harvey Classic Replacement Window

​U-Value 0.28-0.24
Available in 28 Exterior colors and 5 Interior colors 
Vinyl thickness 0.07
Locking Half screen 
The thickness of the frame and sash combined is 3’’
Cam style low profile lock, 5 finish options 
Five options of Grids 
Maximum size 47 3/4’’ wide x 84’’ high 

 You can see from that comparison chart, that Harvey Classic replacement window is slightly more energy efficient than Slimline window. 
   The main difference is the style of cam lock and the locking half screen in Classic window, while it is not in Slimline. 
    The frame of the Classic replacement window is thicker by 1/4 than Slimline.