If your window won’t open, won’t close, or feels stiff and uneven, there’s a good chance the window operator is the problem. Homeowners, contractors, and property managers all end up asking the same question at some point: which operator should I buy?

Choosing the wrong window operator can lead to poor performance, premature failure, or a part that simply doesn’t fit. This guide breaks everything down clearly — from operator types to compatibility — so you can make the right choice the first time.

What Is a Window Operator?

A window operator is the mechanical component that allows you to open and close certain types of windows. It typically consists of a handle, internal gears, and an arm that pushes or pulls the window sash.

Window operators are most commonly found on:

• Casement windows
  
  

• Awning windows
  
  

• Hopper windows
  
  

When an operator fails, symptoms often include:

• Stripped or spinning handles
  
  

• Windows that won’t open fully
  
  

• Uneven or jerky movement
  
  

• Windows that won’t close tightly

Why “Which Operator Should I Buy” Isn’t a Simple Question

There isn’t a universal window operator. Even two windows that look identical may use different operators based on manufacturer, age, or window size.

To answer which operator should I buy, you need to consider:

• Window type
  
  

• Operator style
  
  

• Handing (left or right)
  
  

• Mounting hole pattern
  
  

• Arm length and shape
  
  

• Brand compatibility
  
  

Skipping any of these details can result in a replacement that doesn’t fit or doesn’t work properly.

Types of Window Operators Explained

1. Casement Window Operators

Casement operators use a crank handle to swing the window outward. These are the most common operator type and come in many variations.

Key differences include:

• Single arm vs. dual arm
  
  

• Gear-driven vs. scissor-style
  
  

• Surface-mounted vs. concealed

2. Awning Window Operators

Awning operators are similar to casement operators but are designed for windows hinged at the top. They typically require shorter arms and different torque handling.

3. Split-Arm Operators

Split-arm operators use two arms that distribute weight evenly. These are common on larger or heavier windows and must match arm geometry exactly.

Left-Hand vs. Right-Hand Operators

One of the most common mistakes people make when asking which operator should I buy is ignoring handing.

• Left-hand operator: Window hinge is on the left when viewed from inside
  
  

• Right-hand operator: Window hinge is on the right when viewed from inside
  
  

Installing the wrong handing can prevent the window from opening or closing correctly.

How to Identify the Correct Operator

Before purchasing, check the following:

Measure the Arm

Measure from the gear center to the tip of the operator arm. Even small differences matter.

Check Mounting Holes

Compare the hole spacing and layout on the old operator to the replacement.

Look for Brand Markings

Some operators have manufacturer stamps or logos. Common brands include Truth, Amesbury, Andersen, and Marvin.

Match the Window Size

Larger windows require operators designed to handle more weight and torque.

Common Signs You Need a Replacement Operator

If you’re wondering which operator should I buy, chances are something is already wrong. Common warning signs include:

• Handle spins without moving the window
  
  

• Grinding or clicking noises
  
  

• Window won’t seal tightly
  
  

• Excessive force needed to turn the crank
  
  

Replacing the operator early can prevent damage to hinges, frames, and glass.

Which Operator Should I Buy for Older Windows?

Older windows often use discontinued operators. In these cases:

• Look for replacement equivalents
  
  

• Match arm length and hole spacing first
  
  

• Avoid guessing based on appearance alone
  
  

Professional identification or comparison is often the safest route for older or custom windows.

Conclusion

The correct operator is the one that matches your window’s:

• Type
  
  

• Handing
  
  

• Size
  
  

• Mounting pattern
  
  

• Load requirements
  
  

There is no one-size-fits-all solution. Taking a few minutes to identify these details will save time, money, and frustration.

If you’re still unsure which operator should I buy, expert identification can prevent costly mistakes and ensure smooth, long-lasting window operation. Contact Us Today for help identifying the correct replacements! The WHD Team would be happy to assist you.