Coil spring balancer?

A quick learner from Oakland ca says:

October 2, 2023

It's on both sides of the single hung window, to keep the window open, now both of those are broken, the window won't stay open, the one in the picture is for the left side, but it doesn't have any letters or numbers marked on it, it has 2 springs.
Thanks

Thumbnail of the uploaded file named 16962906036345585396594862173048.jpg

Lauren from SWISCO responded:

October 3, 2023

Hello, thank you for posting,

Your coil balance assembly resembles the 15-102 double side load carrier that is compatible with the Series 145 coil springs. If there are no markings on the springs, we will need to know the weight of the window sash to confirm which weighted coils are needed to support the sash. Please review!

A quick learner from Oakland ca says:

October 3, 2023

It weights 13 lbs

Lauren from SWISCO responded:

October 4, 2023

Thank you for confirming,

We do not have weighted coils that add up to exact 13 pounds, but as long as the range is within a pound the window should function properly.

You can either use (2) S145-3 on each side to get to 12 pounds or (1) S145-3 and (1) S145-4 on each side to get to 14 pounds.

Please review and let me know if you have any additional questions.

Double Side Load Carrier

15-102

$2.65

4 lb Series 145 Balance Spring

S145-4

$3.64

3 lb Series 145 Balance Spring

S145-3

$3.42

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