Double Hung Windows
Jason White
Content Writer
August 12th, 2026
Double hung windows use two vertically stacked sashes that can both move within the frame. This gives homeowners more ventilation flexibility than a single hung design while maintaining the traditional proportions many homes are built around.
Because both sashes can operate, homeowners can open the lower section, upper section or a combination of the two depending on airflow preferences. This makes double hung windows a practical option for bedrooms, living spaces, upper floors and rooms where a classic window appearance is preferred.
Their vertical design also means the window does not project inward or outward when opened. This can be useful near walkways, landscaping, patios and other exterior areas where clearance is limited.
Glazing options can include double pane or triple pane configurations depending on comfort, room exposure and project goals. Homeowners can also consider grille patterns, privacy glass and frame colours to match the style of the home.
Northline’s double hung windows are custom-made for each measured opening and manufactured in Ontario. This helps accommodate both newer construction and older Ottawa homes where existing dimensions may vary.
Professional installation remains important for smooth sash movement. Proper frame alignment, weather sealing, insulation and final hardware adjustment all contribute to reliable everyday operation and long-term window performance.
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Double Hung Basics
How Double Hung Windows Work
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Double hung windows use two vertically stacked sashes that move independently within the frame.
Two Operable Sashes
Both the upper and lower sections can move, giving homeowners more flexibility than a single hung window.
Vertical Operation
The sashes slide up and down rather than swinging into or out of the room.
Flexible Ventilation
Homeowners can open the lower sash, upper sash or both depending on the desired airflow.
Traditional Window Proportions
The divided sash layout creates a classic appearance that works well on many residential exteriors.
No Exterior Projection
Because the sashes stay within the frame, the window does not extend over walkways or landscaping when opened.
Balanced Everyday Function
The design combines familiar operation with more ventilation flexibility than a single operable sash.
Ventilation
The ability to operate both sashes gives double hung windows several ventilation options throughout the year.
Lower Sash Ventilation
Opening the lower sash allows fresh air to enter at a lower level in the room.
Upper Sash Ventilation
The upper section can also be opened where homeowners want airflow higher in the opening.
Using Both Sashes Together
Opening both sections can create a different airflow pattern than using only one sash.
Bedroom Comfort
Double hung windows can provide flexible ventilation in sleeping areas during milder Ottawa weather.
Upper-Floor Applications
They are especially practical where homeowners want ventilation without an outward-opening sash on higher levels.
Seasonal Airflow
Spring and fall are often well suited to natural ventilation when outdoor temperatures are comfortable.
Comparisons
Double hung and single hung windows share a similar traditional appearance, but their sash operation creates different levels of flexibility.
Number of Moving Sashes
Double hung windows allow both sashes to operate, while single hung windows generally have only one movable section.
Ventilation Options
The additional operable sash gives double hung windows more ways to control airflow.
Cleaning Access
Depending on the selected product, double hung windows may provide easier interior access to both sashes for cleaning.
Hardware Complexity
With two operable sashes, double hung windows use more moving components than single hung designs.
Traditional Appearance
Both styles offer familiar vertical proportions and can work well on classic residential architecture.
Project Priorities
Single hung windows may suit homeowners who want simpler operation, while double hung windows provide more flexibility.
Choosing the Right Style
The better option depends on ventilation preferences, room use, cleaning considerations and overall design goals.
Glass & Comfort
Double hung windows can be paired with different glass packages depending on room exposure, comfort goals and overall project priorities.
Double Pane Glass
Double pane glazing can provide a practical option for many residential replacement projects.
Triple Pane Glass
Triple pane configurations may be worth considering where stronger thermal performance and winter comfort are priorities.
North-Facing Rooms
Windows with colder exposure may benefit from higher-performance glazing.
Larger Double Hung Units
As the glass area increases, glazing choice can become more important for overall room comfort.
Privacy Glass
Obscured glazing can be useful in bedrooms, bathrooms or side-facing openings where privacy matters.
Consistent Whole-Home Glazing
Homeowners replacing multiple windows may want to coordinate glass packages across different styles for a more consistent result.
Our Process
STEP 01
Tell Us About Your Project
Tell us what windows or doors you’re replacing and what you need from the project.
STEP 02
Measure & Recommend
We measure your openings and recommend the right window or door options for your home.
STEP 03
Install With Care
We complete the installation with careful fitting, insulation, sealing and finishing.
STEP 04
Final Walkthrough
We review the finished work, confirm proper operation and complete the warranty registration.
From single window replacements to full-home upgrades, Northline keeps the process straightforward from start to finish.
Payment Options
Window Rebates
Home Renovation Savings Program
Eligible window and door upgrades may qualify for rebates through Ontario’s Home Renovation Savings Program, helping homeowners reduce the cost of improving comfort and energy efficiency.
$100/Opening
