As the outdoor temperatures drop below freezing, many homeowners will notice condensation forming on their windows, and sometimes even on their door jambs. While it may seem concerning at first, this is often a sign that your windows are doing their job!
Welcome to the concept of “good condensation”, which reflects the efficiency of your new windows. Let’s explore what this means, why it happens, and how homeowners can manage it effectively.
Why does condensation occur?
Condensation happens when warm, moist air inside your home meets a cooler surface, like your window panes. The temperature difference causes the moisture in the air to condense into water droplets. Ontario homeowners will notice this most commonly in the winter months, when the temperature difference between the indoors and outdoors is at its greatest.
"Good Condensation" is a sign of energy efficiency
If you are seeing condensation on the inside of your windows after installing new ones, it’s not necessarily a problem – in fact, it’s often a good thing and indicates your products are working.
New energy-efficient windows are designed to prevent heat from escaping your home. This keeps your indoor environment warmer and at a consistent temperature, but it also means that the warm, humid interior air is more likely to condense on the colder surface of the glass pane. Think of this type of condensation as evidence that your windows are sealing your home effectively.
A sign of high humidity
While “good condensation” indicates your windows are working effectively, it’s also a sign that the humidity inside your home may be too high. Balancing indoor humidity is critical, not just for preventing excessive condensation, but also for your overall comfort and health.
Ideal Interior Humidity Levels:
- 30 to 50% is recommended for a comfortable indoor environment.
- Below 30% can seem too dry and cause discomfort.
- Above 50% is high humidity which causes excess condensation and potential mold growth.
Interior Relative Humidity Levels (By Temperature, to Minimize Moisture/Condensation) |
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| Outdoor Temperature | Below -30°C | -29°C to -23°C | -23°C to -18°C | -18°C to -12°C | -12°C to -7°C | -7°C to 4°C |
| Indoor Relative Humidity | ≤ 15% | ≤ 20% | ≤ 25% | ≤ 30% | ≤ 35% | ≤ 40% |
| Table Courtesy: FGIA - Fenestration & Glazing Industry Alliance | ||||||
Why Dehumidification is Important
If your windows are fogging up more than you would like, the best course of action is to focus on dehumidifying the area. Here are some effective ways to manage indoor humidity:
- A dehumidifier is a classic, reliable tool for keeping indoor moisture levels in check.
- Improve ventilation by using exhaust fans in kitchens and bathrooms.
- Open windows occasionally, even during winter. This can help release trapped interior moisture.
- Lower your thermostat slightly. By lowering the temperature a little, the air’s ability to hold moisture is reduced.
How Do I Handle "Good Condensation"?
Here a few simple tips we recommended to homeowners to help manage condensation:
- Wipe away excessive moisture with a clean cloth, this will reduce the chances of mold developing.
- Use insulating curtains, or blinds, to help reduce the temperature differences.
- Ensure proper air flow around windows by keeping furniture and drapes away.
"Bad Condensation" vs "Good Condensation"
It’s important for Ontario homeowners to remember that not all condensation is equal! While “good condensation” on the interior of the window is a harmless sign of efficiency, “bad condensation” could indicate a greater problem. Here’s how we tell the difference:
- “Good Condensation” appears occasionally and on the inside of windows during cold weather. It commonly occurs when the temperature difference is greatest between indoors and outdoors.
- “Bad Condensation” is a persistent moisture between window panes, or around frames, that potentially indicates seal failure or poor installation.
Conclusion
The bottom line is that condensation can be a surprising, but positive, sign of energy-efficient windows and doors. By better understanding the cause, and taking simple steps to manage humidity, Ontario homeowners can enjoy the benefits of new windows without concern. Remember, these water droplets mean your windows are keeping the heat inside, where it belongs – saving you money on energy bills and keeping your home cozy all winter.
Frequently Asked Questions
About Window Condensation
Why am I seeing condensation on my new windows?
Condensation forms when warm, moist air inside your home comes into contact with cooler surfaces, like your window panes. This is a natural occurrence, especially during winter, and often indicates that your windows are effectively preventing heat from escaping.
Is condensation on my windows a sign of a problem?
Not necessarily.
Occasional interior condensation on windows is usually a sign of energy efficiency, as the warm air inside is being retained.
However, persistent moisture between panes may indicate a seal failure, which should be inspected.
What's the difference between "good condensation" and "bad condensation"?
“Good condensation” occurs on the interior surface of windows due to higher than normal humidity levels and efficient heat retention.
“Bad condensation” appears between glass panes, around frames, or on walls, which could indicate poor installation, damaged seals, or excess humidity levels.
How can I reduce condensation on my windows?
To minimize condensation on surfaces during winter:
- Use a dehumidifer.
- Turn on exhaust fans in bathrooms and kitchens.
- Open windows occasionally to improve airflow.
- Adjust your thermostat to maintain a consistent temperature.
What is the ideal humidity level for my home?
An ideal indoor humidity level is usually between 30% and 50%. This range minimizes condensation while maintaining comfort, and healthy air quality.
Why didn't I notice condensation on my old windows?
Older windows allowed heat to escape more easily, which reduces the temperature difference that causes condensation. With modern, energy-efficient windows, the improved insulation keeps the interior surface cooler, making condensation more noticeable.
Can condensation damage my windows or home?
Occasional condensation on the glass is harmless, and can be cleaned up with a small towel.
However, excess moisture can lead to issues like mold growth, or damage to nearby walls and furniture.
How do energy-efficient windows help reduce my energy bills?
Energy-efficient windows are designed to prevent heat loss, keeping your home warmer in winter and cooler in summer. By improving insulation, they reduce the need for heating or cooling, ultimately lowering energy costs.
