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Double Hung Window Systems

Top & Bottom Sash Operation

Aluminium double hung window systems offering independent top and bottom sash operation for heritage, period and contemporary architectural applications.

Double hung window systems are specified where traditional window aesthetics are required alongside the practical performance of modern aluminium framing. The ability to operate both the top and bottom sash independently provides flexible ventilation control — opening the top sash allows warm air to escape at ceiling level while the bottom sash draws cooler air in at occupant level. This makes double hung systems particularly suited to heritage and period buildings, education facilities, aged care environments and architect-designed homes where a traditional window profile is part of the design intent. Hunter Windows supplies and installs double hung window systems from the AWS Elevate range, available across multiple series configurations to suit project scale and performance requirements.

double hung windows newcastle hunter

Typical Applications

Double hung window systems are commonly specified across:

  • Heritage and period building refurbishments and additions
  • Education facilities requiring traditional window profiles
  • Aged care environments where familiar window operation is preferred
  • Architect-designed homes with traditional or contemporary-classic aesthetics
  • Commercial buildings in heritage conservation areas
  • Multi-residential developments with traditional facade treatments

Key Performance Considerations

System selection should account for:

  • Sash operation — both top and bottom sashes operate independently; balancing mechanism quality directly affects ease of operation and long-term performance
  • Weather resistance — double hung systems have more joints and seals than fixed or awning systems; series selection should reflect exposure conditions and required water penetration resistance
  • Acoustic performance — glazing selection and frame depth affect acoustic outcomes; relevant to education, aged care and apartment applications
  • Thermal performance — U-value and SHGC ratings vary across series; the ThermalHEART series provides thermally broken frames for projects with elevated NCC energy requirements
  • Heritage and planning compliance — some heritage conservation areas specify window profile dimensions, sight line widths and glazing bar patterns; early confirmation of planning requirements is recommended
  • Glazing capacity — maximum glass thickness varies by series, affecting double glazing and laminated glass options
  • Safe4Kids compliance — friction stay and restrictor options are available where fall prevention requirements apply

Available Range

463 Architectural Double-Hung Window

Double Hung Aluminium Render 463

Architectural Double-Hung Window

  • Commercial-grade with bold frame lines for a premium, elegant finish
  • Thick, strong sashes for large glass spans and unobstructed views
  • Easy installation in brick veneer and cavity brick
  • Both sashes hinge back into the room for easy cleaning of both sides of the glass
  • Secure with a custom key or non-key locking cam handle
  • Tested for compliance and drainage at 450Pa water resistance
Maximum Frame Height* 1050mm
Maximum Panel Width* 1155mm
Maximum Glass Thickness ≤20mm
SHGC Range 0.2-0.58
Uw Range 3.6-6.5

*Maximum Frame Height and Panel Widths indicated are interdependent and subject to individual site conditions.

Brochure
Full Technical Specifications (AWS)

Certified

AS2047
BAL-40
Acoustic Rating
Cyclone Rating

464 ClearVENT™ Sashless Double-Hung Window

Double Hung Aluminium Render 464

ClearVENT™ Sashless Double-Hung Window

  • Sashless design for unobstructed views
  • Fully operable double hung window for maximum ventilation
  • Easy to use with counter pulley system
  • Fixed sill glass panel for top ventilation
  • Compatible with Series 50 or 51 hinged and bi-fold doors
  • Key or non-key locking shoot bolts
  • Compatible with external flyscreens
Maximum Frame Height* 1526mm
Maximum Panel Width* 1210mm
Maximum Glass Thickness ≤6.38mm

*Maximum Frame Height and Panel Widths indicated are interdependent and subject to individual site conditions.

Brochure
Full Technical Specifications (AWS)

Certified

AS2047

Hardware Options

Awning Window Winder
Developed to complement the modern design and clean lines of the Architectural Series, the ANDO™ range brings a fresh and sleek look to residential or commercial windows and doors.
Read More Here

Energy Performance & Thermal Ratings

Double hung window systems are WERS rated, providing verified U-value and Solar Heat Gain Coefficient (SHGC) data for use in NCC energy compliance calculations and thermal modelling.

Key energy performance factors for specification:

  • U-value — measures the rate of heat transfer through the window assembly; lower values indicate better thermal insulation
  • SHGC — measures solar heat gain through the glazing; selection depends on climate zone, orientation and shading strategy
  • Glazing selection — performance outcomes vary significantly with glass type; double glazing, low-e coatings and laminated options are available across the range
  • ThermalHEART series — thermally broken aluminium frames reduce heat transfer at the frame, improving overall window U-values for projects with elevated energy performance requirements

SHGC and U-value ranges for each series are shown in the Available Range section above. For detailed energy performance data and climate zone guidance, see our WERS & Energy Performance and Thermally Broken Frames resource pages.

Integration

Double hung window systems integrate across facade, sector and specification decisions:

  • Facade Solutions — commonly used within commercial framing assemblies and heritage facade treatments; can be combined with fixed glazing panels and transoms to replicate traditional window arrangements across larger openings
  • Sectors — particularly relevant to education and aged care projects where traditional window profiles are preferred; also applicable in architectural homes and commercial buildings within heritage conservation areas
  • Specification — glass selection, colour finishes and hardware are all configurable; glazing bar and colonial bar options may be available on selected series for heritage applications; refer to the Specification section for detail on available options

Frequently Asked Questions

For system selection, heritage application advice or to submit drawings for review, our team is available to assist.

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