Single Hung vs Double Hung Windows: What's the Difference?

Picking between a single-hung and double-hung window sounds simple enough until you’re standing in a showroom trying to figure out why one costs more, cleans differently, and behaves differently in a Chicago winter. We get this question all the time at Chicago Window Guys, and the honest answer is: both are great window types, but the right one depends on where it’s going and what you need it to do.

Here’s what we’ll cover in this guide:

By the end, you’ll know exactly which window type fits your situation and why.

What’s the Difference Between Single and Double Hung Windows?

Both window types look nearly identical from the street. The difference is how the sashes move.

What Are Single-Hung Windows?

A single-hung window has two sashes: a fixed top sash and a movable bottom sash. Only the bottom sash slides up and down. The top sash stays permanently in place.

Single-hung windows are the most common window type in older Chicago homes. They’ve been around since the 17th century, and their simple design is a big part of their appeal.

What Are Double Hung Windows?

A double-hung window has two fully operable sashes. Both the top sash and the bottom sash slide independently, so you can open the top, the bottom, or both at the same time.

Double-hung windows are more popular in newer builds and upper floors. They offer more flexibility for ventilation and are significantly easier to clean from inside your home.

Single Hung Window vs Double Hung Window: A Quick Summary

Here’s the shortest version: choosing between single-hung and double-hung windows comes down to how the sashes hang and move. In a single-hung window, only the bottom sash can move. In a double-hung window, both sashes hang independently and slide.

Side-by-Side: Single-Hung vs Double-Hung Windows

Energy Efficiency: Which Window Type Performs Better in Chicago?

Chicago winters are brutal. Energy efficiency matters a lot here, and this is one area where single-hung and double-hung windows actually differ.

Why Single-Hung Windows Have a Slight Edge

Single-hung windows are generally more energy-efficient because only one sash moves. That fixed top sash creates a permanent, stable seal that doesn’t shift or wear down the way a movable sash does over time.

Fewer moving parts means fewer places where air can sneak through. That’s a meaningful advantage when January temperatures drop below zero.

According to the U.S. Department of Energy, both single- and double-hung windows typically have higher air leakage rates than hinged window types like casements or awnings. But between the two hung options, single-hung windows tend to seal more consistently.

Can Double-Hung Windows Be Just as Energy-Efficient?

Yes, with the right upgrades. Modern double-hung windows come with compression seals, multi-layer weatherstripping, and precision-locking mechanisms that dramatically reduce air infiltration at both sashes.

At Chicago Window Guys, we install double-hung windows with ENERGY STAR-rated glass and low-E coatings that handle Chicago’s climate zones well. When installed correctly, a quality double-hung window can match a single-hung window’s thermal performance. The key word is “installed correctly.” A gap of even 1/16 of an inch around the top sash will cost you on your energy bill.

What Actually Drives Energy Efficiency

Honestly, the sash design is only part of the energy efficiency equation. These factors matter more:

• Glass panes: Double-pane or triple-pane glass makes a bigger difference than whether the window is single or double-hung.

• Frame material: Vinyl and fiberglass frames insulate better than aluminum.

• Low-E coatings: These reflect heat and UV rays, reducing heat transfer in both summer and winter.

• Argon gas fill: Gas-filled panes reduce heat transfer significantly compared to air-filled units.

• Professional installation: Even the most energy-efficient replacement window underperforms if it’s not installed with an airtight seal.

If you’re replacing windows primarily for energy savings, the glass package and installation quality will drive more of your results than the choice between single-hung or double-hung.

Cleaning: The Benefit of Double-Hung Windows That Often Decides It

This is the one area where double-hung windows win clearly. And for homeowners with two-story homes, easier cleaning often becomes the deciding factor.

How Double-Hung Windows Make Cleaning Easier

Both sashes on a double-hung window tilt inward. That means you can clean the exterior glass of both the top and bottom sash from inside your home, without a ladder, without a squeegee on a 12-foot pole, and without asking your neighbor to spot you.

For upper-floor windows, this is a genuine convenience and a real safety advantage. Cleaning a second-floor single-hung window from outside is a ladder job. On a double-hung window, it’s a 10-minute indoor task.

Cleaning a Single-Hung Window

Single-hung windows don’t tilt. The fixed top sash can only be cleaned from the outside of the home. On the ground floor, that’s not a big deal. On the second floor, it becomes a hassle.

If your home is all one story, this difference barely matters. If you’ve got a two-story Chicago bungalow, it’s worth thinking about seriously before you choose a single-hung window for your bedroom.

Ventilation: How Single- and Double-Hung Windows Provide Airflow

Both windows offer ventilation through the bottom sash. But double-hung windows offer something single-hung windows can’t.

The Ventilation Advantage of Double-Hung Windows

With both sashes operable, double-hung windows create a natural convection loop. Warm air rises and exits through the open top sash while cooler air flows in through the bottom sash. This cross-ventilation effect works particularly well in Chicago summers when you want airflow without running the AC.

It’s also a smart setup for homes with young children. Parents can open just the top sash on upper floors, getting ventilation while keeping the lower sash closed for safety.

Single-Hung Windows and Ventilation

Single-hung windows provide ventilation through the bottom sash only. In most rooms, that’s plenty. But in a second-floor bedroom on a 90-degree August night in Chicago, you’ll notice the difference.

If natural ventilation is a priority, double-hung windows give you more control. If you have central air and ventilation is a secondary concern, single-hung windows provide more than enough airflow for most inside your home.

Are Single Hung Windows Cheaper Than Double Hung Windows?

Single-hung windows cost less. That’s a consistent fact across every brand and frame material we work with.

Double Hung Cost vs Single Hung Cost

Single-hung windows consistently cost less than double-hung windows in the same size, frame material, and glass package. When comparing window vs window at the same spec, the double hung cost is typically higher due to the added hardware and manufacturing complexity.

Double-hung windows and single-hung windows may be priced similarly at the budget end of the market, but the gap widens as you move into mid-range and premium tiers. Single-hung windows and double-hung windows both represent excellent value, but they serve different needs.

Single-hung windows have fewer moving parts, which means simpler manufacturing and lower material costs. Hung windows typically cost less on the single-hung side for the same reason a manual car costs less than an automatic: fewer mechanisms.

Single-hung window pricing generally runs lower than double-hung equivalents in the same frame material and glass package. The cost gap narrows as you move up in quality, but it doesn’t disappear.

Double-Hung Window Cost

Double-hung windows cost more because the hardware, manufacturing tolerances, and weatherstripping requirements are all more complex. Both sashes need to slide smoothly, seal tightly, and tilt reliably for years of use.

The good news: double-hung windows may offset some of their higher cost over time through resale value and ease of maintenance. Buyers in competitive Chicago neighborhoods often prefer double-hung windows, and that preference shows up in home appraisals.

Installation Costs for Both Window Types

Installation costs vary by window size, frame condition, and whether it’s a full-frame or pocket replacement. At Chicago Window Guys, we quote every project individually because a standard double-hung in a wood frame behaves very differently than the same window going into aging aluminum stops on a 1960s Chicago three-flat.

Want an accurate quote for your home? Contact our team and we’ll walk you through it.

Differences Between Single-Hung and Double-Hung Windows: Safety and Security

Both window types provide solid home security when locked properly. But there are a few practical differences worth knowing.

Lock Mechanisms and Security

Single-hung windows lock through a latch on the bottom sash. It’s a simple, reliable design with fewer points of failure. Double-hung windows have two locking points, one for each sash. The added mechanism adds flexibility, but also adds one more thing to check when you leave the house.

A double-hung window left with the top sash slightly open is less secure than a single-hung window with its one operable sash fully closed and latched. That’s not a knock on double-hung windows. It’s just a reminder that security comes from habit, not just hardware.

Homes with Young Children

If safety around kids is a concern, double-hung windows offer more control. You can open the top sash while leaving the bottom sash locked, keeping airflow without creating an opening a child could reach.

Many of our clients specifically ask for double-hung windows on upper floors for this reason.

Double-Hung vs Single-Hung Windows: What We Tell Our Customers

We’ve installed thousands of replacement windows across the Chicago metro area since 2010. Here’s the honest guidance we give every customer when they’re trying to choose a single-hung or double-hung window.

Choose a Single-Hung Window If:

• You’re replacing ground-floor windows where cleaning from outside is easy, and ladder access isn’t an issue.

• Budget is a top priority, and you want to maximize coverage without compromising on glass quality or installation.

• You have a historic Chicago home, and single-hung windows match the original character of the architecture.

• Energy efficiency is your primary goal, and you want the slightly tighter air seal of a fixed top sash.

Choosing a Double-Hung Window Makes More Sense If:

• You have second-floor or higher windows where cleaning from the outside isn’t practical.

• You want maximum ventilation control, especially in bedrooms and living spaces where airflow matters.

• You have young children and want the ability to open the top sash only for safety.

• You’re doing a whole-home replacement and want windows that hold resale value over time.

Our Most Common Recommendation

Our most common recommendation for Chicago homes is a mixed approach: single-hung windows on the ground floor where budget and energy efficiency are priorities, and double-hung windows on upper floors where cleaning and ventilation drive the decision.

That split strategy gets customers the benefit of double-hung windows where it matters most without paying the double-hung premium on every opening in the house.

Ready to Choose the Right Window for Your Chicago Home?

Choosing between a single-hung and double-hung window doesn’t have to be complicated. Both are reliable, proven window types that work well in Chicago homes. The right choice comes down to where the window is going, what you need it to do, and what your budget looks like.

At Chicago Window Guys, we’re Chicago’s #1 reviewed window installation company with over 100 five-star reviews and more than 15 years of experience helping homeowners across Arlington Heights, Evanston, Naperville, and the entire Chicago metro area make confident window decisions.

We offer a price-match guarantee and a lifetime warranty on every installation. Whether you’re replacing one problem window or doing a full home window replacement project, we’ll help you find the right window type at the right price.

Get a free, no-pressure quote today. Call us at (847) 701-1322 or fill out our quick online form, and we’ll get back to you fast.