Counter balance system for a window having side loading sashes

A side load window assembly, comprising:

• a window frame having side jambs, wherein a locking depression is disposed in at least one of said side jambs;
• a window sash having a top, a bottom and two vertical sides, said window sash being selectively positionable into an operable position where said vertical sides of said window sash are aligned with said side jambs of said window frame, and wherein a gap space exists between said vertical sides of said window sash and said side jambs of said window frame when said window sash is in said operable position;
• a spring carriage having a first section that fits into said gap space between said window frame and said window sash, and a second section that passes under a portion of said bottom of said window sash, therein supporting said window sash when said window sash is in said operable position;
• a locking mechanism that selectively extends from said spring carriage and engages said locking depression, therein locking said spring carriage in a fixed position within said window frame;
• at least one coil spring, each said coil spring being retained in said spring carriage and having a first end extending from said spring carriage, wherein said first end of each said coil spring is anchored to one of said side jambs of said window frame.