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Do You Need To Close Attic Vents In Winter?

Posted on October 18, 2024

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Attic Vents In Winter

Attic vents are a crucial part of your roofing system, and your home’s comfort depends on their functioning. The primary purpose of these vents is to move the hot air outside your home, keeping your attic and living areas cooler. This is especially important in summer when outdoor temperatures can get very high. 

Due to their ability to keep your roof and attic cooler, many homeowners mistakenly believe these vents are only useful in warm weather. In winter, homeowners often seal their windows, doors, and other areas that might let cold air in, and some close their attics. But is that a good idea? Should attic vents be closed in winter? 

In today’s blog post, we answer this question and more so you are prepared for the upcoming season. Let’s get started! 

What Are Attic Vents?

Attic vents

Before we dive into whether or not you should close attic vents in the winter, let’s take a moment to understand what these vents are and why they’re important.

Attic vents are designed to allow air to circulate in and out of your attic. This circulation helps control the temperature and humidity levels inside the attic space. You’ll typically find two types of attic vents:

  • Intake vents (like soffit vents): These are located under the eaves of your roof and allow cool air to enter the attic.
  • Exhaust vents (like ridge vents or gable vents): These are placed at higher points of the roof to let warm, moist air escape.

This natural airflow keeps your attic in balance. Contrary to popular opinion, these vents are not only useful in the summer, attic ventilation plays a year-round role in maintaining your home’s health. So no, you should not close your attic vents in winter

Also Read: Roof Vents 101: Ventilating Your Attic the Right Way

Clearing The Common Misconception: Closing Vents in Winter

Closing vents in winter

It’s a common belief that as soon as winter hits, you should close off attic vents to keep warm air inside the home. The thinking behind this is pretty straightforward: cold air in the attic means more energy is needed to heat the rest of the home. Unfortunately, this assumption can lead to costly mistakes.

Let’s break down some reasons people think they should close attic vents in winter:

  • To prevent cold air from entering the attic: Many people worry that open vents will let in cold air, making their home chillier.
  • To save on heating bills: The assumption is that if the attic is sealed off, your heating system won’t have to work as hard, leading to savings.
  • To avoid drafts: Homeowners often assume attic ventilation causes drafts, making the house less comfortable.

However, the reality is that closing attic vents can actually lead to problems that are much worse than a little cold air. Without proper ventilation, moisture builds up in the attic. That trapped moisture can cause mold growth, rotting wood, and even damage to your roof’s structure.

Why Attic Ventilation Is Important in Winter

As we have covered in the earlier section, closing your attic vents during winter is not a good idea. But why is keeping them open in the winter so important? The key lies in understanding how ventilation and insulation work together to protect your home from the cold weather and other harsh conditions: 

Preventing Moisture Buildup and Condensation

One of the biggest threats to your home in winter is moisture. Your home is more vulnerable to the effects of moisture buildup in the winter. Every time you cook, take a shower, or do any other chore, moisture is present. This warm, humid air naturally rises and ends up in the attic. Now, if your attic vents are closed in winter, all that moisture gets trapped, and this is where the problem begins.  When the warm air hits the cold roof deck, it turns into condensation. Over time, this moisture can lead to mold growth, wood rot, and a host of other issues that can weaken the structural integrity of your roof and attic.

Reducing the Risk of Ice Dams

Ice dams can occur in colder climates and can be a nightmare for homeowners. In states like Oklahoma, these are fairly common. 

They form when warm air from your home heats the roof, causing snow to melt and refreeze at the eaves, which are relatively cooler. This creates a dam that prevents proper drainage. Any water that backs up behind the dam can leak into your home and cause damage. Proper attic ventilation helps regulate the temperature of your roof, reducing the likelihood of ice dams forming in the first place.

Keeping Attic Temperatures Consistent

You might think that keeping the attic cold in winter is a bad thing, but it actually helps maintain a consistent temperature across your home. When warm air escapes into the attic and gets trapped, it can cause uneven heating and cooling. By keeping your attic vents open, you allow cold air to enter the attic and keep the temperature consistent, which helps your insulation do its job more effectively. This balance prevents heat from getting trapped and stops moisture problems in their tracks.

Energy Efficiency and Insulation Protection

Without proper ventilation, the trapped heat and moisture in your attic can also reduce the effectiveness of your insulation. Over time, this can lead to higher energy bills as your HVAC system works overtime to maintain a comfortable temperature. By ensuring proper airflow, you can protect your insulation and keep your home more energy-efficient throughout the year.

But What About Heat Loss Through Attic Vents?

You might still be thinking, “Won’t keeping my attic vents open in the winter cause me to lose heat?” This is one of the most common concerns homeowners have, but the good news is that your attic ventilation has very little to do with heat loss inside your home.

Here’s why: The key to keeping your home warm in winter is insulation, not ventilation. The insulation in your attic acts as the barrier that stops warm air from escaping. The job of the vents is to remove any moisture and maintain consistent airflow, preventing issues like mold, condensation, and ice dams. In fact, closing off your attic vents can make heat retention harder.

How to Maintain Attic Vents This Winter

Here are a few easy steps to keep your attic ventilation in top shape this winter:

  • Clear any blockages: Make sure your vents aren’t covered by insulation, leaves, or other debris. Blocked vents can restrict airflow, leading to moisture problems.
  • Check for ice or snow buildup: After snowfalls or freezing weather, inspect your vents to ensure they aren’t clogged with ice or snow, which can prevent proper ventilation.
  • Inspect for damage: Regularly look for any signs of damage or wear on your attic vents, especially after storms or heavy winds. 

Also Read: 3 Types of Attic Vents & Best Brands You Should Know In 2024

Prepare Your Roof For Winter With Our Premier Roofing Services

Winter is tough on your roof, and ensuring your attic vents are properly maintained is just one part of the equation. At A. Fricker Roofing and Waterproofing, we’re here to help you prepare your roof for the colder months with expert inspections, repairs, and maintenance. Whether it’s ensuring your attic ventilation is functioning correctly or addressing any other roofing concerns, our team of professionals is ready to provide the solutions you need.

Don’t wait until winter sets in—reach out to us today at (918) 402-7167 for a thorough roof inspection.

Attic Vents In Winter