How to Install Alarm Sensors on Double Hung Windows

Installing alarm sensors on windowsills is a great way to protect your home from intruders. Most burglars will try to enter through a window if they can, so you can increase the chances of catching them in the act by having sensors on all of your windows. In this article, we’ll show you how to install alarm sensors on double hung windows.

How to Install Alarm Sensors on Double Hung Windows

Why Install Alarm Sensors on Double Hung Windows?

Alarm sensors are an important part of home security systems. They help to deter burglars and alert homeowners to potential threats. For example, double-hung windows are a common entry point for burglars, so it is important to have alarm sensors installed on all double-hung windows in your home.

Alarm sensors work by detecting movement and sound within a certain range. When the sensor is triggered, it sends a signal to the home security system, sounding an alarm. This can deter burglars and alert homeowners to potential threats.

In addition, alarm sensors can also help prevent accidents by alerting homeowners to open windows. It is important to have alarm sensors installed on all double-hung windows in your home for these reasons.

Required Materials

  • Alarm sensors
  • Tape measure
  • Drill
  • 1/8″ drill bit
  • Screws
  • Phillips head screwdriver

How to Install Alarm Sensors on Double Hung Windows Step by Step Guide

Step 1: Measure the Window Sill

Before installing your alarm sensors, you need to measure the window sill. This is the space between the two window panes. To do this, use a tape measure or ruler.

You Can Use a Tape Measure

Step 2: Measure the Distance

Once you have the approximate size of the window, you need to measure the distance from the top of the frame to the bottom. This will give you how long your sensor wire needs to be. If you have a standard double-hung window, the chances are that the distance will be about 24 inches.

Step 3: Cut the Sensing Strip

Cut the sensing strip to size and peel off the backing using a sharp knife. Stick the sensing strip to the top of the window, making sure that the adhesive side is facing down.

Step 4: Attach the Magnet

With the adhesive side of the magnet strip facing the sensor, line up the top edge of the magnet with the top edge of the sensor. Then, press the magnet firmly in place against the sensor.

Step 5: Cut the Foam Tape(Optional)

Use a utility knife to cut the foam tape with your alarm sensors. You’ll need to make two cuts for each sensor, one for the top of the window and one for the bottom. Make sure that each cut is long enough so that the sensor will fit snugly against the window when it’s in place.

Step 6: Test the Sensor Before Installation

The most important part of the installation is to test the sensor before you install it. This will save you a lot of time and frustration if there are any problems with the sensor. To test the sensor, open the window and close it quickly. The alarm should sound immediately. If it does not, there may be a problem with the sensor.

Step 7: Install the Sensor

With the window open, clean the surface of the glass where the sensor will be installed with isopropyl alcohol and a lint-free cloth. Next, peel back the red liner on the adhesive pad of the sensor to expose the adhesive. Next, center the sensor on the glass and press it into place. Finally, replace the red liner on the adhesive pad.

Step 8: Review the Placement

Once the adhesive has dried, open and close the window to check that the sensor is firmly in place and not likely to fall off. If it seems secure, re-install the batteries and screw on the cover. Next, test the alarm by waving your hand in front of the sensor (it should be about 6 inches away). The alarm will sound, indicating that it is working properly.

Step 9: Test the Sensor with Your Device

Now that your alarm sensor is installed, you can test it with your security system or home automation device. Open and close the window to see if the device picks up the signal with the sensor in place. If it does, then you’re good to go!

If you have any questions about how to install alarm sensors on double hung windows, don’t hesitate to get in touch with a professional for assistance. Do not attempt to install alarm sensors on double-hung windows if you are not confident in your abilities, as this could damage the window or injury yourself.

What Type of Alarm Sensor Should I Use for Double-hung Windows?

Double-hung windows can be protected by a variety of alarm sensors, such as magnetic contact switches or infrared motion sensors. If you’re looking for the most reliable protection, we recommend using magnetic contact switches. These are designed to detect when the window is opened or closed and will immediately trigger the alarm if they sense any movement.

Infrared motion sensors are also effective for double-hung windows, as they detect any movement within their range and will set off the alarm if something is detected. For best results, ensure that your alarm system is professionally installed and monitored to maximize security.

How Does an Alarm Sensor Work?

An alarm sensor is a device used to detect an intruder’s presence. There are many different alarm sensors, but the most common type is the passive infrared (PIR) sensor. This type of sensor detects changes in infrared radiation emitted by all objects with a temperature above absolute zero.

When an intruder enters the protected area, the sensor detects the change in infrared radiation and triggers the alarm.

Most alarm sensors are designed to be installed on doors and windows. However, they can also be installed on other home parts, such as in attics or basements.

Main Categories of Alarm Sensors

There are four main types of alarm sensors:

  • Magnetic contact sensors
  • Infrared motion detectors
  • Photoelectric beams
  • Glass break sensors
  • Surface-Mounted and Recessed Sensors
  • Wireless and Hardwired Sensors

Magnetic Contact Sensors

Magnetic contact sensors are the most common type of alarm sensor. They consist of two parts: a magnet and a switch. The magnet is mounted on the window frame, and the switch is mounted on the window. The magnet and switch are connected when the window is closed and the alarm is triggered.

Infrared Motion Detectors

Infrared motion detectors are another common type of alarm sensor. They work by detecting changes in infrared energy. When an intruder enters the protected area, the change in infrared energy is detected, and the alarm is triggered.

Photoelectric Beams

The photoelectric beam is the most common alarm sensor used on double-hung windows. These beams are typically installed in pairs, with one transmitter and one receiver. The transmitter sends out a beam of light that the receiver picks up. If the beam is interrupted, it triggers the alarm.

Glass Break Sensors

Glass break sensors are another type of alarm sensor used on double-hung windows. These sensors detect the sound of glass breaking and then trigger the alarm.

Surface-Mounted and Recessed Sensors

There are also surface-mounted and recessed sensors that can be used on double-hung windows. Surface-mounted sensors are easier to install, but they are more visible and may be more likely to be tampered with. Recessed sensors are less visible, but they can be more difficult to install.

Wireless and Hardwired Sensors

Finally, there are wireless and hardwired sensors. Wireless sensors are easier to install, but they require batteries to be replaced periodically. Hardwired sensors are more difficult to install, but they do not require batteries.

How Do You Install a Ring Sensor on A Double Hung Window?

Installing a ring sensor on a double-hung window is a relatively easy process. However, there are a few things you need to keep in mind before beginning the installation. First, make sure that the area around the window is clear and free of any obstacles. This will allow you to work and ensure that the sensor is installed properly.

Next, determine the best place to install the sensor. It is important to avoid areas where there is a lot of heat or cold air, as this can affect the sensor’s performance. Once you have found an ideal location, use a drill to make a hole for the sensor. Be sure to use the right size drill bit so that the sensor fits snugly in the hole.

After the hole has been drilled, insert the sensor into the hole and screw it in place. Once the sensor is installed, you will need to connect it to your home security system. Consult your system’s manual for specific instructions on how to do this. Finally, test the sensor to ensure that it is working properly. Keep reading for more information about how to install alarm sensors on double hung windows.

How Do You Install a Wired Window Alarm Sensor?

  1. Cut a hole in the bottom of the window frame using a power drill, and a 1-inch hole saw. The hole should be big enough to accommodate the sensor’s wiring.
  2. Install the sensor in the hole, ensuring that the wires are long enough to reach the alarm control panel.
  3. Connect the sensor’s wires to the alarm control panel according to the manufacturer’s instructions.
  4. Test the sensor to make sure it is working properly.

Tips and Considerations for Installation on Double-Hung Windows

  • When installing alarm sensors on double-hung windows, it is important to remember that the window may be opened from the top or bottom.
  • The sensor should be installed high enough on the frame so that it cannot be reached from the outside but low enough so that it can still detect movement.
  • It is also important to ensure that the sensor is not obstructed by any furniture or other objects in the room.
  • Finally, make sure to test the sensor before leaving the premises.

Safety Precautions

Before beginning any work with tools or on a ladder, be sure to take the following safety precautions:

  1. Read all instructions for your alarm system and sensors before beginning installation.
  2. If you are not comfortable working with tools and wiring, please consult a professional for assistance.
  3. Always exercise caution when working with tools and electricity.
  4. Be sure to shut off all power to the area you will be working in before installing.
  5. Follow all local building codes and ordinances when installing your alarm system.

Frequently Asked Question

Where Do the Sensors Go on A Double-Hung Window?

There are two main types of double-hung windows: those with wood frames and those with metal frames. Therefore, the installation process for alarm sensors will be slightly different depending on your window type.

For wood-framed windows, the sensors should be installed on the top and bottom rails of the window. For metal-framed windows, the sensors should be installed on the top and bottom sashes of the window.

Do Casement Windows Need Alarm Sensors?

Installing alarm sensors on casement windows is a great way to improve the security of your home. These devices are designed to detect forced entry and trigger an alarm if someone tries to break in. While most homes come with standard sensors, you may want to consider upgrading to wireless or motion-activated models for added protection.

Do I Need Entry Sensors on Every Window?

If you have an alarm system, you may be wondering if you need to install entry sensors on every window. The answer to this question depends on how your alarm system is set up and how you plan to use your windows.


Installing alarm sensors on double-hung windows is a quick, easy way to make your home more secure. By following the simple steps in this article, you can have peace of mind knowing that your home and family are safe and protected. Thanks for reading our post about how to install alarm sensors on double hung windows.

You may also read: How to Open a Window From Outside

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