What is a double-hung window?
A double-hung window is a very common type of window found in homes across the country. It has two separate glass panels. Builders call these panels sashes. Both the top sash and the bottom sash can slide up and down inside the window frame. This is different from a single-hung window, where only the bottom part moves and the top part stays fixed in place.
In most modern versions, both of these sashes can also tilt inward. You simply unlock the window, slide the sash up a few inches, and pull the release latches on the top corners. The whole glass panel drops forward into your hands. This means you can clean the outside glass right from inside your living room. You don't need to climb a tall ladder just to wash your second-story windows.
Why this design matters
This window style gives you great control over the fresh air coming into your house. Hot air naturally rises to the ceiling. Cool air sits closer to the floor. When you open the top sash, the hot indoor air escapes outside. When you open the bottom sash, the cool outdoor breeze blows inside. Opening both at the same time creates a cycle of fresh air that cools a room down quickly. During the spring and fall, you can turn off your air conditioner entirely and rely on this natural airflow. This saves you money on your monthly energy bills.
This setup is also very helpful for families with small children or pets. You can leave the bottom sash closed and locked. Then, you just open the top sash to get fresh air. This keeps kids and pets safely inside while still letting your house breathe. Good ventilation can also help your HVAC & Climate Control system run better by keeping stuffy rooms comfortable.
Replacement costs
Eventually, old windows leak air and need replacing. The price to replace a double-hung window usually falls between $400 and $900 per window, including labor. These ranges vary widely depending on the materials you choose and where you live. A basic vinyl window sits at the lower end of that price range. A premium wood frame or fiberglass window pushes the cost much higher.
Labor alone can cost $150 to $300 per window. If your contractor has to fix rotted wood inside the wall before they install the new window, expect to pay extra for that repair work. If you're planning a big project, you can learn more about what to expect on our Window Replacement Cost page. Keep in mind that custom sizes or special glass coatings will also add to your total bill.
What to watch out for
Double-hung windows have a few moving parts that can wear out over time. Here are the most common issues you might face:
- Broken balances: The balance is a hidden spring or weight mechanism inside the frame. It holds the window up when you open it. If your window slams shut on its own, the balance is broken.
- Drafts and leaks: The spot where the two sashes meet in the middle is called the check rail. If the window isn't locked tight, air can leak through this gap. Always lock your windows to seal out cold air.
- Painted shut: In older historic homes, previous owners often paint right over the window seams. This glues the top sash in place. You'll need to carefully score the paint with a utility knife to get it moving again.
If you notice major wood rot around the outside frame, you might want to look at our guide to Windows & Doors for tips on when to call a professional.
