Do casement windows seal better than double hung?

Author: Suzanne Christiansen  |  Last update: Tuesday, October 7, 2025

Double-hung and casement windows both offer excellent energy efficiency, with casement windows having a slightly tighter seal around the window when closed and locked. Both styles are durable.

What is the downside of casement windows?

Another downside of casement windows is that they may not be as secure as other window styles, such as sash windows. This is because casement windows often only have one locking point, which can be forced open.

Do casement windows last longer than double hung?

Double-hung windows may open and close easily at first, but over the years, they may become more difficult to open if not maintained properly. When it comes to durability, double-hung windows usually win out when compared to casement windows, especially casement windows that are made of wood.

Which window seal is best?

Silicone seals are known for their durability and flexibility. They can be used on both wood and metal frame windows, making them a versatile choice. Silicone is also resistant to extreme temperatures and UV rays, which means it won't degrade quickly over time.

What are the most airtight windows?

Casement windows are better at stopping air infiltration than any other type of operating window because of the tight seal that can be achieved around the entire sash.

Casements vs double hung, which is better?

What are the best windows for air leakage?

One thing is for certain, you can rule out wood, fiberglass and composite windows. These windows almost always have a higher air leakage rating than vinyl windows. Vinyl windows with double or triple panes are excellent at keeping air out of your home.

Which type of window tends to be more airtight?

Casement windows are significantly more airtight than double hung windows. No operating window closes tighter or more securely than a casement window, allowing secure entry points to your home and family's safety.

Which window type is most prone to air leakage?

Single- and double-hung. Both sashes slide vertically in a double-hung window. Only the bottom sash slides upward in a single-hung window. These sliding windows generally have higher air leakage rates than projecting or hinged windows.

How often should you replace window seals?

How long do window seals last? Most window seals will last longer than 10 years. In fact, you will likely find that most window and door manufacturers will give you a 10 year guarantee. That being said, we recommend checking your window and door seals every 5 years.

What is the best type of window sill?

Stone window sills

Stone is the most durable option you can install and will last forever. Whether you use a manufactured stone like quartz or Corian, or a natural stone like marble or granite, a stone window sill will resist moisture, humidity, sunlight and require little maintenance.

Do casement windows seal better?

Double-hung and casement windows both offer excellent energy efficiency, with casement windows having a slightly tighter seal around the window when closed and locked. Both styles are durable.

What is the disadvantage of double-hung windows?

Due to their design, which includes multiple movable parts and sashes, double-hung windows can be more prone to air infiltration compared to other window types. Over time, the seals around the sashes may wear down, leading to drafts and decreased energy efficiency.

Are casement windows out of style?

Chances are, you're picturing a double-hung window with two sashes mounted vertically in the frame. Casement windows, a style that hinges open to the side with a crank, are sometimes thought of as outdated or old-fashioned. But this could not be further from the truth.

Which window is better, casement or double hung?

Your windows should let plenty of air into your home when they're open—and keep the air outside when they're closed. Although both casement and double-hung windows offer excellent ventilation and energy efficiency, casement windows are ideal for this category.

What is an issue you need to consider when using casement windows?

One of the most common hassles homeowners have with casement windows is difficulty opening them due to the sashes becoming stuck. This can be attributed to neglected hardware, malfunctioning window locks or expansion and contraction due to temperature changes.

Why do casement windows leak?

Check the weatherstrip on your casement or awning window for gaps, damage, or permanent compression (flattened weatherstrip). We recommend replacing any weatherstrip with gaps or displaying signs of damage or normal wear.

How much does it cost to get a window resealed?

This often calls for window seal repair or a full window replacement. Window seal repair costs $70–$245, but most homeowners spend $120 or under.

Is it worth getting windows resealed?

There are many benefits of resealed windows that can help improve your home. Moyes Glass wants to help you reap all the benefits of windows and natural light. When you have your windows professionally resealed, you will see better energy efficiency in your home which will help lower energy bills.

Where not to caulk around windows?

Quick answer: Don't caulk the weep holes, moving portions, or the tops of your windows.

What type of window seal is the best?

The three main materials used for window gaskets and seals are:
  • Silicone is a more durable option that can be used for both wood and metal frame windows.
  • Neoprene is the most durable option and is typically used for metal frame windows.
  • Felt is the most common type of gasket and is typically used for wood frame windows.

Do double-hung windows leak air?

Slightly lower efficiency: Double-hung windows can let some air pass between the two sashes, but not enough to make a significant difference.

What windows have the best R value?

Windows with high R values include double-glazed windows, triple-glazed windows, and argon-filled windows. Double-glazed windows have two layers of glass with a space in between, while triple-glazed windows have three layers of glass.

How can I make my windows more airtight?

  1. Use Weather Strips. Weather strips are an inexpensive way to seal doors and windows in your home. ...
  2. Install New Door Sweeps. Installing a door sweep along the bottom of an exterior door can block out cold air. ...
  3. Apply Foam Tape. ...
  4. Insulate with Window Film. ...
  5. Hang Insulated Curtains. ...
  6. Recaulk Windows and Doors. ...
  7. Use a Door Snake.

What type of windows keep cold air out?

Triple-pane windows are the most advanced and energy-efficient choice for cold climates. They contain three layers of glass in addition to two insulating spaces filled with air or gas. This design offers superior insulation, keeping heat loss to a minimum.

Why are casement windows so expensive?

Casement window costs are on average 10% more expensive than double hung windows due to the complex mechanisms involved in the crank opening. Double hung windows are also the more widely used among the two, which leads to higher competition among manufacturers, keeping costs down.

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