How to Replace a Window Balancer: A Step-by-Step Guide

Updated at: 20/05/2025

Dealing with a stubbornly stuck or rattling window can be incredibly frustrating, often stemming from a faulty window balancer. These seemingly small components are crucial for smooth window operation, providing the necessary counterweight and allowing for effortless opening and closing. A broken or worn-out balancer not only impacts the functionality of your window but can also compromise its security and energy efficiency, leading to drafts and potential damage. Ignoring the problem will only exacerbate the issue, potentially requiring more extensive and costly repairs down the line.

Replacing a window balancer is a surprisingly manageable DIY task, saving you the expense of hiring a professional. This guide will walk you through the process step-by-step, providing clear instructions and helpful tips to ensure a successful repair. Let's get started with a simple, straightforward approach to restoring your window's smooth operation.

Preparation and Safety Guidelines

Tools Needed
  • Flathead screwdriver
  • Safety glasses
  • Gloves
Safety Guidelines
  • Always disconnect the window from its operating mechanism (e.g., disconnect the sash from the tracks) before attempting any repairs. This prevents accidental injury from a falling window.
  • Use appropriate safety equipment, such as gloves and safety glasses, to protect yourself from sharp edges or potential debris.
  • If you are uncomfortable performing this task yourself, or if you encounter unexpected difficulties, contact a qualified window repair professional.

Step-by-Step Instructions

  1. Prepare the Window

    • Remove the takeout clips on either side of the window jam using a flathead screwdriver at a 45° angle.
    • Remove the sash stops located in the top corners of the window.
    Remove the sash stops located in the top corners of the window.
    Prepare the Window

  2. Remove the Sash

    • Slide the sash up until it disengages from the takeout clips. Ensure both sides catch on the takeout clips.

  3. Remove the Balancer

    • Slide the sash to one side to access and remove the spring-loaded balancer (use caution).
    • To remove the balancer, push it down and then slide it back up.
    To remove the balancer, push it down and then slide it back up.
    Remove the Balancer

  4. Install the New Balancer

    • To reinstall, place the hook at the bottom of the balancer into the window jam and press down (it's spring-loaded, so expect resistance). Push the top portion up and ensure the tab goes on the outside of the balancer.
    To reinstall, place the hook at the bottom of the balancer into the window jam and press down (it's spring-loaded, so expect resistance). Push the top portion up and ensure the tab goes on the outside of the balancer.
    Install the New Balancer

  5. Reinstall the Sash

    • Reinstall the sash by placing it above the bottom of the balancer, lining it up, pushing it in, and balancing it back and forth until both sides catch.
    • Slide the sash down about an inch or two. Ensure you don't see the balancer or any metal on either side of the spring.
    • Push in both takeout clips and bring the sash down.
    • Reinstall the sash stops.
    Reinstall the sash stops.Reinstall the sash stops.Reinstall the sash stops.
    Reinstall the Sash

Read more: 3M Thinsulate Window Film Installation: A Step-by-Step Guide

Tips

  • Use caution when handling the spring-loaded balancer.
  • Expect resistance when pushing down on the spring-loaded balancer during reinstallation.

Common Mistakes to Avoid

1. Forgetting to disconnect the sash from the balancer

Reason: Attempting to remove the old balancer without detaching the window sash can lead to damage to the window frame or the balancer itself.
Solution: Always disconnect the sash from the old balancer before attempting removal.

2. Using the wrong type of balancer

Reason: Different windows use different types of balancers; using an incorrect replacement will result in a poorly functioning window.
Solution: Measure the old balancer carefully and purchase an exact replacement or one with the same specifications.

3. Incorrectly adjusting the tension on the new balancer

Reason: If the tension isn't set correctly, the window may be too difficult to open or close, or may not stay in place.
Solution: Follow the manufacturer's instructions carefully to adjust the tension on the new balancer to achieve proper window operation.

FAQs

What tools do I need to replace a window balancer?
You'll primarily need a screwdriver (likely a Phillips head), possibly a putty knife to carefully remove old caulk, and a new window balancer that matches your existing one. Measuring the old balancer before purchasing a replacement is crucial.
My window is still sticking after replacing the balancer. What could be wrong?
Several things could cause this. Ensure the new balancer is correctly installed and seated properly. Check the window tracks for debris or obstructions. The problem might also lie with the window frame itself, requiring further adjustments or repairs.