Preventing Window Condensation: Tips and Tricks for Homeowners 

Written by Jeremy Ryan Created on January 27th, 2025
Categories: Window and Door Maintenance


Winter doesn’t always feel like quite the wonderland—and your windows would surely nod in agreement as they battle condensation. 

If you’ve ever asked yourself, “Why are my windows sweating on the inside?” you’re not alone. Windows sweating inside is a common dilemma, particularly during the colder months when the Calgary humidity turns into a frosty foe. But don’t worry—we’ve got 15 tips and tricks to help you tackle moisture inside windows and keep your view crystal clear.

Table of Contents | Preventing Window Condensation: Tips and Tricks for Homeowners 

1. Understanding Condensation on Your Windows 

  • Interior Window Condensation
  • Exterior Window Condensation
  • The Negative Effects of Window Condensation

2. Stop Condensation on Windows with These 15 Tips 

  • Ventilation is Key
  • Dehumidifiers to the Rescue
  • Use Weatherstripping
  • Triple-Glazed Windows
  • Keep Your Home Warm
  • Install Exhaust Fans
  • Use Window Insulation Kits
  • Install Storm Windows
  • Use Ceiling Fans Wisely
  • Use a Hygrometer
  • Houseplants: A Double-Edged Sword
  • Dry Clothes Outside (When Possible)
  • Check for Leaks
  • Check for Damage
  • Choose the Right Window Manufacturer

3. Window Manufacturer Near Me: Combat Condensation with Western Windows  


Understanding Condensation on Your Windows  


Before diving into solutions, it’s important to understand what causes condensation both inside and outside your windows.


Condensation on Inside of Window 


Condensation on the inside of windows happens when warm, moist air inside your home comes into contact with the cooler surface of the window. This type of condensation is more common during the winter months when the temperature difference between the indoor and outdoor air is significant. High indoor humidity levels, inadequate ventilation, and poor insulation can exacerbate the issue, making your windows appear as if they’re sweating.


Exterior Window Condensation


Condensation on the outside of windows generally occurs when the window surface is cooled to a temperature below the dew point of the outside air. This often happens on cool mornings or evenings and is usually a sign that your windows are well-insulated. While it might seem concerning, outside condensation is typically not an issue, as it doesn’t affect indoor comfort but rather indicates energy-efficient windows.

Condensation inside a window


The Negative Effects of Window Condensation


Condensation on windows isn’t just a foggy annoyance—it can lead to various issues in your home:

  • Mould Growth: Persistent moisture creates the perfect breeding ground for mould and mildew, which can affect indoor air quality and health. If you notice condensation, it’s always best to take action right away. 
  • Structural Damage: When window condensation happens, it can spell trouble for the structure of your fixtures. Over time, excess moisture can seep into window frames, leading to wood rot and deterioration.
  • Energy Inefficiency: Condensation on windows often indicates poor insulation, leading to higher energy bills as your heating system works overtime.
  • Obstructed Views: Foggy windows obstruct natural light and outdoor views, diminishing the comfort and aesthetic appeal of your home.


Stop Condensation on Windows with These 15 Tips 


1. Open Windows When Possible: Ventilation is Key 


The first rule of thumb in preventing window condensation is to improve ventilation. Proper ventilation allows for the exchange of moist indoor air with drier outdoor air, effectively reducing indoor humidity levels. Start opening your windows when the weather permits as this helps reduce the moisture inside homes, ultimately minimizing condensation on windows.


2. Dehumidifiers to the Rescue


Calgary humidity can be incredibly unpredictable—and that’s why a dehumidifier will be your new best friend in managing indoor moisture levels. By extracting excess humidity from the air, these devices help prevent condensation on the inside of windows. Dehumidifiers work by drawing moist air over refrigerated coils, causing water to condense and be collected, leaving drier air to circulate back into the room. Condensation issues will think twice about causing trouble when you have a dehumidifier in your home. 


3. Use Weatherstripping


Not only is weatherstripping great for keeping your home warm, but it also reduces moisture build-up by sealing gaps around windows and doors. This prevents cold air from seeping in and warm air from escaping, maintaining a stable indoor temperature and reducing the likelihood of windows sweating inside. Effective weatherstripping can significantly lower energy costs and enhance comfort.


4. Triple-Glazed Windows


With the extreme winter weather in the city, double glazed windows often just won’t cut it. When considering window replacement in Calgary, triple-glazed windows are a stellar choice. These windows feature three panes with insulating gas layers in between, such as argon or krypton, providing superior insulation compared to single or double-glazed options. 

This design minimizes heat transfer, keeping the interior window glass surface warmer and reducing the likelihood of condensation on windows. They’re a smart investment for those looking to beat the chill and keep moisture at bay.


5. Keep Your Home Warm


Maintaining a consistent indoor temperature can help combat condensation. When indoor air is warmer, it can hold more moisture without reaching the dew point, thus reducing the formation of condensation on windows. Turn up that thermostat a notch and let your home’s warmth do the heavy lifting in preventing window condensation. A stable indoor temperature also contributes to overall comfort and energy efficiency.


6. Install Exhaust Fans


Exhaust fans aren’t just for the kitchen—they can also work wonders in bathrooms and laundry rooms. These fans expel humid air directly outside, preventing it from circulating and condensing on cooler surfaces like windows. The goal is to expel moist air outside, reducing the chance of condensation on the inside of windows. So whenever you’re cooking or taking a shower, keep in mind that the regular use of exhaust fans during any activities that generate moisture is absolutely essential.


7. Use Window Insulation Kits


Window insulation kits are a cost-effective solution for those looking to keep condensation at bay. These kits typically consist of a clear plastic film that adheres to the inside of window frames, creating an additional insulating layer. This layer reduces heat loss and helps keep the interior glass surface warmer, making them an excellent ally in the battle against moisture inside windows.


8. Install Storm Windows


Storm windows don’t just protect you from the elements—they’ll make condensation think twice about forming on your fixtures. By installing storm windows, you can enhance your home’s insulation and significantly reduce the occurrence of moisture on windows. Did you know that. this additional layer can also protect against drafts and reduce noise?


9. Use Ceiling Fans Wisely


Ceiling fans aren’t just for summer cooling. Set them to spin clockwise during the winter months to push warm air down from the ceiling, helping to maintain a uniform temperature throughout your home. This can reduce the chances of condensation forming on your windows by keeping the temperature consistent and preventing pockets of cooler air near window surfaces.


10. Use a Hygrometer to Avoid High Humidity Levels


Your home simply isn’t complete without a hygrometer that helps monitor the humidity in your home. These devices provide a real-time reading of indoor humidity levels, allowing you to adjust your strategies accordingly. Aim for a humidity level between 30% and 50% to prevent condensation on windows. Knowing the humidity in Calgary can help you make the right adjustments, such as increasing ventilation or using a dehumidifier when needed.


11. Houseplants: A Double-Edged Sword


Houseplants are lovely creatures that bring plenty of benefits to any home—but they can also increase humidity levels by releasing moisture through a process called transpiration. Who would’ve thought they could be one of the causes of window condensation?

If you’ve got a mini indoor garden situation going on, consider moving some plants away from windows or reducing their numbers to help prevent window condensation. Alternatively, opt for plants that are less prone to releasing moisture if maintaining your green oasis is a priority.


12. Dry Clothes Outside (When Possible)


Calgary weather doesn’t always permit outdoor drying, but when it does, take advantage! Drying clothes indoors can significantly raise humidity levels, contributing to windows sweating inside. If drying outside isn’t an option, consider using a dryer with a vented exhaust to the outdoors to keep indoor moisture levels in check.


13. Check for Leaks


Sometimes, the answer to “Why are my windows sweating?” is simple: a leak. Regularly check for leaks around windows and doors, sealing any gaps you find. This prevents cold air from meeting warm indoor air, which often results in condensation. Use caulking or weatherstripping to seal leaks, improving energy efficiency and comfort.


14. Check for Damage


Over time, windows can suffer from wear and tear. It might look like they’re just sitting there all day, but their job is tough. Cracks, broken seals, or other damage can lead to increased condensation problems, as they allow cold air to enter and warm air to escape, creating the perfect conditions for condensation. Regularly inspect your windows for any signs of damage, and address any issues promptly. If necessary, consult with reputable window installation companies for repairs or replacements.


15. Choose the Right Window Manufacturer


If condensation seems to persist despite all these tips, then it might be time to opt for window replacement in Calgary. Companies that specialize in energy-efficient windows can provide solutions that combat condensation effectively. Look for window suppliers with a strong reputation for quality and innovation to ensure your investment pays off in reduced condensation and improved comfort.


Window Manufacturer Near Me: Combat Condensation with Western Windows


Condensation on the inside of windows is a common issue, but with the right strategies, it’s a problem you won’t have to be stressed out about any longer. 

For those in Calgary seeking the best solutions, Western Windows is your top source for new windows that effectively combat condensation. Since 1977, we’ve built a reputation as one of the premier window installation companies that offers top-tier products and excellent customer service.

Request a free estimate today! 

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Western Windows Experts
At Western Windows, we understand that your home is your sanctuary, and we believe that the right windows can make all the difference in enhancing its comfort, beauty, and energy efficiency. Through our blog, we aim to provide you with valuable insights, tips, and inspiration to help you make informed decisions about your window needs. Whether you're looking to upgrade to energy-efficient windows, enhance your home's curb appeal, or simply seeking guidance on maintenance and care, we're here to guide you every step of the way. Thank you for choosing Western Windows—we're committed to exceeding your expectations and helping you achieve the home of your dreams.
Jeremy Ryan
At Western Windows, we understand that your home is your sanctuary, and we believe that the right windows can make all the difference in enhancing its comfort, beauty, and energy efficiency. Through our blog, we aim to provide you with valuable insights, tips, and inspiration to help you make informed decisions about your window needs. Whether you're looking to upgrade to energy-efficient windows, enhance your home's curb appeal, or simply seeking guidance on maintenance and care, we're here to guide you every step of the way. Thank you for choosing Western Windows—we're committed to exceeding your expectations and helping you achieve the home of your dreams.