19+ Causes & Fixes to Get Rid of Inside & Outside Window Condensation

Condensation is one of the most common problems that homeowners experience. It reduces humidity and can cause extra expenses and unforeseen issues within the property.

This home problem refers to the formation of water droplets and frost on a surface, which raises the amount of water vapor in the atmosphere. It formed for various reasons, including the internal surface temperature of the window being lower than the dew point of the surrounding atmosphere. Or it might be caused by high interior humidity and chilly outside temps.

So how do we beat it? Here, we will identify the factors that cause humidity to drop at home and the different ways to prevent it.

window condensation

Cold Moisture at Home (An introduction)

Humidity problems at home form through moisture.

We know that air contains water, which we call humidity, and that this water forms a vapor. When we expose a cold surface to water-containing air, part of the water will simply settle in it, interact with other water molecules, and form visible water droplets.

Water molecules build a weak chemical bond with the oxygen in the silicon dioxide in the glass, causing it to stick. Water will condense on practically any cold surface in theory. Still, if those weak bonds aren’t formed, they will just bead up like water on a surface. Unless the humidity is relatively high, the water will likely evaporate after a few minutes.

For example, a cold surface will develop if you take a slow, hot breath and blow it against a window. If you watch it closely, you’ll observe the water re-evaporate and return to the gaseous state. This occurs because your breath is hotter than the window, yet it cools down and evaporates back into the air after some time.

In your daily life, you can observe examples of this. When you bathe, cook, or simply breathe, humidity levels rise. Another example is a cold beverage in a warm room with visible water droplets on the glass. This is the most basic kind of condensation.

Why do I Get Condensation on my Windows?

A lot of people believe that windows automatically cause condensation. In principle, it is triggered either by humid or cool air coming into contact with cold surfaces. Or when vapor-filled air comes into contact with cold surfaces. And it is likely to be experienced throughout different seasons as well.

The seal has failed, which is why this is happening. When the inside seal is damaged, moisture from different temperatures can condense on the inside.

It occurs whenever the conditions are favorable. It is more prevalent during the winter when it is pretty cold outdoors. The windows get extremely chilly as well, and moisture from the inside air condenses on them.


Before we learn how to stop this air problem, we need to understand the different forms of it.

Indoor or interior

It happens to the interior panes due to numerous factors such as air conditioning, cooking, showers, etc. Cool air formed as a result of well-insulated structures trapping within humid air.

Excessive moisture in the house causes interior window condensation, most common in the winter when warm air condenses on chilly windows. Usually, when the seal between the panes fails, or the desiccant within the windows becomes soggy, it is when it happens.

Outdoor or exterior

It happens when the interior of the window is substantially colder than the exterior.

When humid air is outside, the shallower layer closest to the window gets chilled below its dew point temperature. It can no longer hold the quantity of water vapor as it did. Water vapor sublimates on the cold glass surface, forming visible droplets.

Gap condensation on double-glazed windows

It takes place when two glass panes are used for double-glazed windows or doors.

This developed because the cold windows reduce the air temperature in contact with them below the dew point, causing water vapor in the air to concentrate as water.

When the seal between the spacer and the two glass panes weakens, a reaction occurs. In specific ways, it falls apart. This provides a channel for moisture to accumulate and condense on the coldest surface.

Moisture moves to a minor dense area of the atmosphere. Once the gas has wholly leaked out, the free space between the panes is filled with moisture.

Problems Caused by Condensation

The most severe issue is black mold, wood rot, and other buildups.

Molds require a sufficient amount of water to spread and flourish; thus, they love damp environments. If your windows are abnormally moist, this is the first sign of a probable infestation. And of course, inadequate or inappropriate ventilation, as well as missing or improperly applied sealant, can all contribute to precipitation, potentially causing structural damage.  When a seal fails, mold spores may follow and begin to grow in the resulting damp environment.

If this problem is left untreated, it can cause issues with your windows and the surfaces below. Water allowed to run onto lower surfaces may cause wet and dry rot or even black mold.

A typical complaint is an inconvenient and unsightly look caused by mists, especially in older homes and humid areas. It may be more than just an aesthetic concern. Aside from foggy views or dark and dismal regions, the main issues are decreased energy efficiency and the possibility of wet, rot, and mildew spreading and damaging the frames.

How to Fix the Problem

There are several aspects to consider to fix this issue. These vary from controlling the humidity, moisture levels in the house, maintaining the temperature, air movement within, and keeping cold air away from your home are the keys to preventing misting.

The colder it is outdoors, the more likely cold steam may form. If you have single-pane ones, there may be no way to help without making your home excessively dry.

There are a few remedies you can try, all of which depend on the severity of the problem.

#1. Maintain the proper temperature in your home

It is essential to control the temperature in your home. The problem can only exist if a surface is cold on which moisture may accumulate; keeping windows and walls warm is crucial. Use your furnace to boost the temperature during the winter months, especially if the humidity is intense.

First, purchase a Hygrometer to determine your humidity levels. You should aim for approximately 35% or not higher than 40% for your comfort.

When the humidity in the house becomes too high, take action to lower it. When the temperature outdoors is below 0 degrees Fahrenheit (-18 degrees Celsius), keep the humidity in your home between 15 and 25 percent. When the temperature outdoors is between 0 and 40 degrees Fahrenheit (-18 and 4 degrees Celsius), keep the humidity indoors between 25 and 40 percent.

#2. Keep interior air moving (FAN ON)

After you’ve determined that your humidity level is correct, create an open airflow. Remove window covers and run fans on the furnace and ceiling fans, as well as anything else that will keep the air circulating. If your furnace has a humidifier, ensure it is correctly adjusted.

Changing the direction of your ceiling fans’ movement during the winter will help push warm air up and spread it, preventing moisture from gathering and accumulating on your surfaces. If you have exhaust fans in your kitchen and bathroom, they can help you remove excess water from the air. Ceiling fans should be rotated counterclockwise throughout the summer, on the other hand.

#3. Proper ventilation

When showering, use bathroom vents and fans. After your shower, leave them on for at least 20 minutes. When cooking, use kitchen and stove fans. After you’ve finished cooking, run them for around 15 minutes. When doing laundry, make sure your dryer vents to the outside. When using a wood-burning fireplace, keep the damper open at all times. A gas fireplace must have a chimney that ducts outside, and a wood-burning fireplace must have a chimney that vents outdoors.

ventilation being improved

#4. Consider Air exchanger

This is a heat exchanger with a built-in ventilation fan. These are pretty pricey, but they will help you save money on energy by reducing energy loss. Furthermore, because this device raises the temperature of your home, it will aid in the prevention of wetness.

Installing an air Exchanger is the best option, which pumps fresh air into your house via a heat exchanger; however, this will be impossible if you live in an apartment. It’s a bit expensive, but it’s an efficient way to get rid of stale air and bring in fresh air.

#5. Raise or moderate the dew point

Cool air problems arise on any surface when the temperature dips below the dew point of the air. To avoid it, elevate the temperature or decrease the dew point. Even low dew points will condense on the icy glass; thus, the most reasonable approach to lower it is to raise the surface temperature. This is often accomplished by using numerous layers of window material or boosting the glass’s heated airflow. You may also want to increase the air conditioner’s temperature.

#6. Put off Humidifier

Humidifiers are designed to increase the amount of moisture in the atmosphere, leading more mist to form as condensation. When there is a moisture problem, shut off any humidifiers, especially those linked to the furnace.

#7. Put up a Dehumidifier

Conversely, dehumidifiers are required to remove water vapor from the air, making them perfect solutions for homes vulnerable to dampness. You may either install a whole-house dehumidifier or buy a portable unit that you can move about anywhere in the house. For best results, empty the drip pan/basin on the dehumidifier frequently to keep moisture from dissipating back into the space.

This method works; however, it is costly and results in dry air in your home. If you’re going down this route, we recommend this unit from Vremi.

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Here's an Energy Star-rated solution to getting the air moisture levels under control!

#8. Improve Insulation

Why not try the insulation kits? These kits are units that may be installed outside your panes to prevent congestion from forming on the inside. While these kits can help compensate for the loss of energy efficiency caused by condensation, they cannot fix the problem independently. However, if you want to save money on your heating expenses, insulation kits can assist. We’ve included the one we really like underneath.

Insulator Kit
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Insulator Kit
Great insulator kit from 3M.

#9. Invest in Air Deflector

Raise the temperature of the room, especially the area lying closest to the window. Perhaps AC vents in the ground or ceiling are blowing cold air on them. Installing deflectors to divert the air might help.

#10. Warm up the windows

Another solution is to keep the windows warm, which you may achieve by adding thermopane or storm windows or upgrading older single-pane ones with double or triple glazing. The air gap between the panes prevents the interior pane from becoming cold enough to condense the water vapor in the air.

This may be costly, but it will enhance your home’s energy efficiency, allowing you to save money on your utility costs.

#11. Give them a good cleaning

Before taking any drastic remedies, it would be prudent to assess the problem by thoroughly cleaning the windows. The fogginess may have been coming from a buildup of a cleaning chemical or grease in the kitchen.

#12. Increase the flow of outside air

When the weather allows, take advantage of the chance to open your windows and let the fresh air inside your home. Opening up lets the heavier, heated air exit and circulates any moisture accumulated in the ducts or seals. When you leave open drapes and curtains, it allows air to flow against the panes, which dries off wetness on the panes and blocks buildup from developing. The ideal time to open them, as well as the curtains, is on bright days when the sun’s warmth and light will dry off moisture.

#13. Upgrade Your Panes

Upgrading your windows is a better, although more expensive, option. It indicates that you are wasting heat in the winter and gaining heat in the summer by opening up to the outside.

The problem is because of worn and broken seals in double-pane windows. You can fix this by replacing the panes, which is a reasonably inexpensive and easy procedure.

However, replacing the entire unit becomes a more likely remedy if the situation has gotten worse.

Whereas moisture has leaked out of the seals into the frames, causing them to rot and grow inflated. When considering replacement, it is wise to consult with an expert to determine the best choice for you.

#14. Seal Openings

Weatherstripping by far will keep cold air from blowing in and cooling the walls and windows. It will not only save you money on energy costs, but it will also prevent dampness. It’s a kind of weatherproof strip applied to windows to keep cold air out of joints and frames.

You should also consider installing a storm window, especially if yours only have a single pane of glass. This type will create a barrier between the outside and the interior of your home, reducing moisture.

Whether you have cold or warm weather coming in your direction, the weather sealing tape underneath can help, and will in addition also save you money on your energy bill.

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This weather sealing tape from 3M is a cost-efficient solution to look into.

#15. Caulk up cracks and openings wherever you see them

Cracks and openings are other opportunities for chilly air to enter your home. You can use caulk to insulate around any cracks to keep the walls and windows from cooling. GE Sealants is a trusted company that you can use for the purpose.

GE Sealants
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GE Sealants
At less than $10 per tube, you cannot find a better offer on your sealant.

#16. DIY Alternative

You may use a 12 cm strip of Styrofoam against the glass on the inside of the window’s bottom. A 15 cm wide piece of coarse bubble wrap at the bottom of the glass might also work. Simply saturate the bubble wrap and lay it, bubble side up, against the glass.

#17. Homemade Insulator (Visqueen)

Another alternative is to cover the windows with Visqueen and seal the edges in some way. For example, you might make a Styrofoam frame, wrap your Visqueen over that frame, and tape it to the frame. Create an inch of isolated space for insulation and prevent moisture from inside the structure from condensing on the glass, causing mold. It would also help to insulate your interior and to avoid air leaks. Keep you warm, save money on heating, and prevent decay.

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Here's a great plastic poly sheeting you can use from Norkan.

#18. Fix structural damage of the house

Because of the activities in these areas, some rooms, such as restrooms, wet rooms, and kitchens, are more prone to condensation. When you heat only in some rooms to save energy, the hot air flows and collides with the cold surfaces in the unheated areas, resulting in condensation.

#19. Remove exterior wall obstructions

Remove plants and furniture away from the outside walls to allow for proper circulation and ventilation.

#20. Moisture absorber

It uses a unique material that efficiently absorbs water and protects the window’s area. The “water snake” is the most frequent. It effectively absorbs moisture around the glass. Mini dehumidifiers and charcoal bags are popular in some houses. Nonetheless, they serve the same purpose as humidity absorbers.

Dry & Dry
584 Reviews
Dry & Dry
If you've got issues with moisture in your house, this can be a great solution if you don't want a humidifer running.

How do you Remove Moisture from Double Pane Windows?

If the seal is breached, it is impossible. There is no way to get the moisture between the panes of a double-glazed window once the seal fails. When the seals break, the windows no longer appropriately insulate. They are now costing you money to cool and heat the rooms in the summer and winter, respectively.

If you reside in a humid area, the ensuing fog on the glass may worsen with time and may even sprout mold. It is reasonable to have them re-sealed or replace the pane. Still, the cost is high enough that replacing the entire thing is the most cost-effective option. Replace them with a suitable replacement.

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