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How to Stop CCTV Cameras from Fogging Up

This article is a collaborative effort, crafted and edited by a team of dedicated professionals.

Contributors: Muhammad Baballe Ahmad, Mehmet Cavas, Sudhir Chitnis, and Zhen-ya Liu.

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How to Stop CCTV Cameras from Fogging Up – The temperatures are dropping and for some of us, that means our security cameras are starting to fog up. Here are a few quick and easy tips to prevent your outdoor security cameras from fogging up this winter.

Understand the Causes of Fogging

Eye lenses, camera lenses and windows can all fog up under certain circumstances and this can be a problem for CCTV cameras too. Fogging of CCTV cameras can occur when the camera lens is exposed to sudden changes in relative humidity and temperature. In order to reduce the risk of fogging, it is important to understand the causes and preventative measures that can be taken.

Temperature Differentials

Temperature differentials in your monitoring area can contribute to fogging in CCTV cameras. This is because warm, moist air moving through the environment quickly settles on cold surfaces, such as camera lenses or internal components of the camera. For instance, if there are sudden fluctuations in temperature or if a cold winter night brings with it colder temperatures outside, the air inside the building may become cooler; thus forming condensation when it meets further colder surfaces.

You should therefore pay close attention to temperature differences within your property and its surroundings. Your aim is to create a more homogeneous temperature environment by keeping the indoor and outdoor temperatures as close as possible so that moisture does not condense on the surfaces around the camera lens and other sensitive locations. Attempts to warm up any areas with excess fogging may actually do little to help prevent fogging in certain cases; instead making these issues worse. You can also use cooling fans placed directly behind CCTV cameras to help control drastic temperature changes and reduce instances of fogging.


High relative humidity can cause moisture to condense on or inside the camera. This is because tiny water droplets form when warm air collides and mixes with colder air, reaching a saturation point. As the ambient temperature around the camera drops below this point, the moisture in the air will then condense on to surfaces it touches, a phenomenon referred to as ‘fogging’. To combat this issue, it is important to install cameras in areas with a low relative humidity – ideally below 55%. Moreover, when choosing an area for your CCTV setup, keep in mind that this condition may not be consistent across entire rooms. Humidity levels may vary due to ventilation systems and even openings of doors and windows, so it’s best to avoid areas where changes in humidity are more likely.

Another important factor to consider is air flow. If you leave doors or windows open nearby your cameras regularly, cold air from outdoors can rapidly cool down images sensors causing fogging faster than what happens due to relative humidity. To avoid fogging caused by different types of airflow – continuous as well as intermittent – CCTV cameras must be placed in locations where constant sources of cold air don’t exist and away from fans or vents that could bring cold drafts indoors periodically and impact their temperatures drastically.

Dust and Pollutants

Dust and pollutants can reduce the clarity of the image on your CCTV camera. The fine particles will settle on the lens, reducing visibility. High levels of dust and pollutants in the air can also contribute to fogging, created by the combination of warm temperatures inside and outside your camera’s housing along with high humidity. This condensation will form a layer on your lens, obscuring your footage. Regular cleaning can help reduce the impact of dust and pollutants by removing any dirt or debris which has settled on the surface of your lens, although this does not provide a permanent solution if you are operating in an area with high levels of dust or pollution.

Prevent Fogging

Fogging can cause your CCTV footage to be blurry and difficult to view, meaning it can become useless for analysis. Luckily, there are a few approaches you can take to prevent your CCTV cameras from fogging up and ensure clear footage. This article will detail the steps you need to take to stop fogging and keep your CCTV footage crystal clear.

Use a Heater

Using a heater to stop CCTV cameras from fogging up is a useful and reliable way to reduce the risk of video footage becoming interfered with due to bad weather such as mist and fog. Heaters will work by increasing the temperature of the air around the camera lens, this in turn prevents atmospheric moisture from condensing on the lenses. However it is important to make sure that you install your heater correctly so that its heat does not interfere with or cause damage to nearby equipment.

When installing a heater for your CCTV camera you must ensure that:
– Its power supply is matched correctly with its wattage and voltage requirements
– It is kept at least 10 cm away from any other pieces of equipment or nearby surfaces to ensure that they are not affected by its heat
– Install it using anti-vibration mountings in order to prevent any secondary damage caused by vibrations
– Make sure it remains out of sight and where possible keeps out of range of the security cameras
– Secure the heater firmly in place using appropriate fixings

Use a Dehumidifier

Using a dehumidifier to keep your camera enclosure dry is a simple and cost-effective solution for preventing fogging. By reducing the surrounding area’s humidity level, you can keep fog from forming on the lens of the camera. To be effective, your dehumidifier should be able to cycle out more moisture than it takes in; otherwise, it may not provide enough damp-proofing to prevent lens fogging. Additionally, make sure that you replace the dehumidifier’s filter regularly for maximum efficiency.

Another benefit of using a dehumidifier is that it can greatly prolong the longevity of your CCTV system by protecting its components from corrosion and condensation. As the water vapor levels in your CCTV enclosure decrease, condensation won’t form, and this will help protect your electronics from corrosion or malfunction due to moisture accumulation.

Finally, a dehumidifier can reduce dust buildup around your cameras and increase their overall performance and life cycle. Dust is not only unsightly but also affects how well cameras perform as it clogs up vents and blocks air intake outlets on surveillance systems. By keeping cameras dry with a dehumidifier, you can reduce dust accumulation as well as improve their image capture capabilities over time by keeping lenses clear of fog build-up from condensation or water droplets.

Clean the Camera Regularly

Preventing a camera from fogging up is accomplished by cleaning the camera regularly. This means making sure the camera lens is free of dirt, dust and debris which can prevent air from circulating properly and cause fogging. The camera’s glass surfaces should be washed with a lint-free cloth, using warm water and mild detergent. Whenever wiping down the lens do not rub it harshly as this may scratch it or leave streaks which can distort your image.

For cameras located in harsh environments like where dust, smoke, or chemicals are present frequently cleaning may need to be more frequent to ensure quality images are maintained. It is recommended that cameras located in harsh environment should be cleaned at least several times a week and after any major event that produces dust or smoke such as welding or cutting metal parts in a workshop environment.

Additionally, the interior of the camera should be inspected regularly to make sure that moisture isn’t building up inside due to condensation which can also cause fogging problems on the lenses. If this is discovered any fans or filters located within the unit should be replaced or serviced to address this issue as well as cleaning any inside components of the cameras air intake such as dust filters located on top of enclosure etc.

Reduce the Risk of Fogging

Blurred or fogged CCTV images can be a huge security issue, as they are useless in identifying persons or objects, and can be exploited by criminals. Maintaining a clear image is paramount for a successful surveillance system. In order to reduce the chance of your CCTV cameras fogging up, there are a few preventive steps you can take. Let’s cover these in more detail.

Install a Protective Cover

Installing a protective cover over your CCTV camera can be an effective way to reduce the risk of fogging. This cover is often made from metal and is installed around the lenses of the camera to protect them from moisture. If you live in a high humidity area, you may want to get a cover that’s been treated specifically for this purpose, as these covers are more efficient at keeping moisture away from the lenses. Covers should also be fitted properly with enough room for ventilation, as stagnant air can create condensation on the lens. Having your cameras professionally installed will ensure that they are placed in an area that is not prone to fogging and protects them against any damage caused by weather or vandalism.

Use Anti-Fog Sprays

Using an anti-fog spray is a simple and effective solution for reducing the risk of fogging. It works by creating a superfine layer of invisible film on the lens surface that prevents condensation from clinging to the glass. Anti-fog sprays are generally very affordable and simple to apply. Just spray a light mist on both sides of the camera lens, allow it to dry for a few minutes, and then wipe any residue off with a soft cloth or brass wire brush, if necessary. Make sure you repeat this process every two months or so in order to reap its full benefits. To maximize efficiency, keep your camera protected from external elements whenever possible – especially during rainy weather – as these can contribute significantly to fogging.

Install an Anti-Fog Filter

Installing an anti-fog filter is one of the best ways to reduce the risk of your CCTV cameras fogging up. This type of filter is designed to reflect humidity away from camera lenses, preventing condensation. It’s important to check that the filter you choose is compatible with your CCTV cameras as different models have different requirements.

Another important point to consider before installing an anti-fog filter is the type of environment you’re in. If it’s a cold, wet climate, then a regular filter may not be enough and you may require additional protection. For example, if you are located in an area with high levels of humidity, then an extra layer such as VivaTech’s vapor shield will provide maximum protection against moisture and fogging up your cameras.

The installation method for each anti-fog filter will also differ depending on the model and brand but it can generally be accomplished using simple tools such as a pair of scissors or a screwdriver set. If any part of the installation process feels too complex or dangerous, always refer to the manufacturer’s instructions for assistance or contact a professional for further assistance.


Troubleshooting CCTV cameras can be a difficult task and one of the more frequent problems that arises is the camera lens fogging up due to environmental conditions. It can severely affect the quality of footage and can even cause cameras to completely malfunction. In this article, we will talk about how to identify if your CCTV cameras are fogging up and how to prevent it from happening.

Check the Camera’s Settings

Before adjusting the camera’s settings, it is important to check the manual as each camera model may differ. One suggestion to reduce the amount of condensation on the lens is to reduce the brightness or contrast settings by using the menu on the display monitor. However, this will also reduce image clarity and may affect security measures if outside surveillance requirements need to be met. Additionally, lowering temperature and humidity settings can help, but this should be done carefully as decreasing humidity levels too much can also lead to dust accumulation within the device. Reducing light intensity can also be beneficial for night vision cameras as a way of reducing fogging up of lenses.

Check the Lens

Check the lens of the CCTV camera to check for signs of dirt and debris. Dirt, dust, fingerprints and smears can contribute to fogging due to the way they absorb moisture. Ensure that all lenses are free from any filthy appearance and fingerprint free by wiping with a lint-free cloth located in the installation bag of most CCTV systems.

Another key point is to make sure that the entire lens is covered with a high-grade optical grade anti-stat dust repellent spray which will help repel dust and dirt so it does not attach itself to any part of the camera body or lens area. Make sure not to apply this directly onto the glass as it may have a detrimental effect on the visibility quality; instead use a lint-free cloth as mentioned above.

Replace the Camera if Necessary

Depending on the severity of the fogging, it may be necessary to replace the camera. If your existing camera has been exposed to extreme weather conditions over an extended period of time, then it may pose a real problem. Replacing the camera ensures that a new model with enhanced fogging prevention capabilities will replace it, allowing for clear recording quality. The cost for replacement can range from a few hundred dollars for compatible indoor models to several thousand dollars for outdoor cameras and associated hardware. If you are unsure about the best choice for your system, contact a qualified technician for assistance.

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