Single Hung vs Double Hung Window: What’s the Real Difference?

The key difference between a single hung and a double hung window is which sashes move. In a single hung window only the bottom sash slides up, while in a double hung window both the top and bottom sashes move independently. That one difference cascades into real impacts on ventilation, cleaning, energy performance, and price — so getting this choice right before you buy matters.

Key takeaways

• Single hung windows have one operable sash (bottom); double hung windows have two operable sashes.
• Double hung windows cost roughly 10–20% more than single hung equivalents.
• Both types are available with ENERGY STAR™ certified glazing packages suited to Ontario’s Climate Zone 2.
• Double hung windows tilt inward on both sashes for easy cleaning from inside — a major practical advantage in multi-storey homes.
• Single hung windows have fewer moving parts, which means fewer seals to wear out over time.

How each window type actually works

A single hung window operates much like a traditional sash window: the top sash is fixed in place, and you push the bottom sash upward to let air in. The meeting rail — where the two sashes overlap — stays roughly in the middle of the frame when the window is fully open.

A double hung window uses the same vertical sliding mechanism but gives you control over both sashes. You can drop the top sash, raise the bottom sash, or run them simultaneously. That flexibility changes how air circulates through a room in ways that single hung windows simply cannot replicate.

If you want to understand how single hung window replacement works in practice, the configuration of the frame and balance systems differs between the two types, which affects both lead times and installation costs.

Ventilation: where double hung wins clearly

Stack ventilation is the main reason many GTA homeowners prefer double hung windows. Warm, stale air rises and exits through the lowered top sash while cooler fresh air enters through the raised bottom sash. You get cross-flow without a fan.

With a single hung window, all incoming and outgoing air must pass through the same opening at the bottom. That works fine for most rooms, but in bathrooms, kitchens, or any space where you need to move humid air out quickly, the double hung arrangement is more effective.

• Double hung: top sash drops for warm air out, bottom sash rises for cool air in
• Single hung: bottom sash only — all airflow through one opening
• Stack effect works passively with double hung — no mechanical assistance needed
• Both types suit standard double-hung window sizes for Canadian residential construction

Cleaning and maintenance comparison

This is where double hung windows earn their price premium for most homeowners. Both sashes on a quality double hung unit tilt inward on pivot hardware, so you can clean the exterior glass from inside the room. On a second or third floor, that matters enormously — no ladder required.

Single hung windows let you tilt the bottom sash in on most modern designs, but the fixed top sash stays put. Cleaning the outside of that upper glass means going outside or reaching from an adjacent window. It’s a minor inconvenience on the ground floor and a real problem on upper storeys.

“The tilt-wash function on a double hung is something I always recommend to my clients with two-storey homes. After 20 years inspecting properties, I’ve seen more people skip window maintenance entirely because access is difficult — and that leads to frame rot, failed seals, and water ingress. Easy access means windows actually get cleaned.” — Marcus Delvecchio, RHI, Registered Home Inspector, Hamilton-Halton region

Maintenance intervals also differ slightly. Single hung windows have fewer weatherstripping seals and balance mechanisms to maintain. Double hung windows have twice the number of sash seals and two independent balance systems, which means more potential points of wear — though high-quality vinyl frames with fusion-welded corners hold up well under Ontario’s freeze-thaw cycles.

Check our guide on common double hung window problems if you’re troubleshooting an existing unit before deciding on a replacement style.

Energy efficiency: closer than you’d expect

Both window types can achieve strong thermal performance when built to current standards. The glazing package — Low-E coatings, argon gas fill, warm-edge spacers — matters far more than whether the window is single or double hung.

That said, double hung windows do carry a slight thermal disadvantage. Two operable sashes mean two meeting rails and two sets of weatherstripping that must seal tightly. Any compression seal degrades over time, and if air infiltrates at the top sash meeting rail, heat loss increases.

Feature	Single Hung	Double Hung
Operable sashes	1 (bottom)	2 (top and bottom)
Typical U-factor range (double glaze)	1.4–1.7 W/m²K	1.5–1.8 W/m²K
Weatherstripping seal points	Fewer	More
Stack ventilation	No	Yes
Tilt-wash cleaning	Bottom sash only	Both sashes

Both types are compatible with ENERGY STAR™ certified insulated glass units, and both qualify for consideration under NRCan’s Canada Greener Homes Grant programme when installed as part of an eligible retrofit. If energy performance is your top priority, read more about energy efficient windows replacement to see which glazing specs apply.

Cost comparison

Single hung windows are cheaper, full stop. The additional balance hardware, pivot hardware, and weatherstripping on a double hung unit adds to both manufacturing cost and installation time.

Window size (approx.)	Single Hung (supply & install, CAD)	Double Hung (supply & install, CAD)
Small (24″ × 36″)	$550–$750	$650–$850
Medium (30″ × 48″)	$700–$950	$850–$1,100
Large (36″ × 60″)	$900–$1,200	$1,050–$1,400

Prices are estimates for the GTA market in 2026. Final quotes depend on frame material, glazing package, and site-specific installation requirements.

If you’re replacing multiple windows across a full home, even a $150–$200 difference per unit adds up fast. On a 12-window project, choosing single hung throughout could save $1,800–$2,400 — money that could go toward a better glazing package on each unit.

Use our window cost estimator to model both options for your specific project.

Which rooms suit which type?

Not every room calls for the same solution. Here’s a straightforward split based on how each room gets used:

Single hung works well for:

• Ground floor bedrooms and living rooms with easy exterior access
• Basement installations where cleaning from outside is simple
• Rooms where budget is a primary factor and ventilation demands are low

Double hung works well for:

• Upper-storey bedrooms and bathrooms
• Kitchens where humidity needs to exit quickly
• Heritage or traditional home styles where the divided-lite aesthetic matters
• Any room where interior-only cleaning is a practical requirement”I specify double hung for upper floors and single hung for ground-level rooms as a default starting point. The cleaning argument alone justifies the price difference upstairs. But I’d never tell a homeowner to install double hung everywhere — the additional seal points at the top sash meeting rail are a real long-term consideration in Ontario’s climate, where thermal cycling is aggressive.” — Priya Rangan, BCIN, Building Designer, Fenestration and Thermal Envelope Specialist, Brampton, ON

Pros and cons side by side

	Single Hung	Double Hung
Cost	Lower	Higher (10–20%)
Ventilation	Basic	Superior (stack effect)
Cleaning access	Bottom sash only	Both sashes tilt in
Seal complexity	Simpler	More seal points
Aesthetic options	Standard	Same + traditional divided-lite
Energy performance	Slightly better sealing potential	Comparable with quality hardware

For a full breakdown of the pros and cons of double hung windows, including long-term performance data, that page goes into considerably more detail.

Making your final decision

If you’re replacing windows on a single-storey home and your priority is keeping costs down while maintaining solid thermal performance, single hung is a perfectly sound choice. The simpler seal geometry is not a drawback — it’s a feature in a climate with -20°C winters.

If you’re working on a two-storey or three-storey home, double hung pays for itself in practical terms. The ability to clean both panes from inside, combined with passive stack ventilation, makes daily life easier and protects your frame investment by actually getting cleaned on a regular schedule.

Either way, the glazing package is where performance lives. A single hung window with triple glazing, Low-E 366 coating, and a warm-edge spacer system will outperform a double hung unit fitted with basic double glazing every time. Talk to a TotalSeal consultant about pairing the right sash configuration with the right glass specification for your home.

You can also explore our double hung window replacement and single hung window replacement pages to see current product options, or read up on how to measure single hung windows if you’re preparing for an in-home quote.

FAQ

Are single hung windows cheaper than double hung?

Yes. Single hung windows typically cost 10–20% less than double hung windows of the same size and glazing package. The saving comes from fewer balance mechanisms, pivot hardware, and weatherstripping components in the single hung design.

Can double hung windows improve ventilation compared to single hung?

Yes. Double hung windows enable stack ventilation — warm air exits through the lowered top sash while cooler air enters at the bottom. Single hung windows cannot replicate this because the top sash is fixed.

Which type is easier to clean?

Double hung windows are easier to clean on upper floors because both sashes tilt inward, allowing exterior glass to be cleaned from inside. Single hung windows only allow the bottom sash to tilt, leaving the upper exterior pane inaccessible without going outside.

Do single hung or double hung windows perform better in Ontario winters?

Both can perform equally well when fitted with ENERGY STAR™ certified glazing. Single hung windows have slightly fewer seal points, which can reduce air infiltration risk over time, but the glazing specification matters far more than sash count in determining thermal performance.

Is it worth upgrading from single hung to double hung during a replacement?

It depends on the floor level and how the room is used. For upper-storey rooms and bathrooms, the cleaning convenience and ventilation improvement generally justify the added cost. For ground-level rooms with easy exterior access, single hung remains a practical and cost-effective option.