FAQ

When buying aluminium windows, do not compare only the profile appearance or aluminium window price. Evaluate the complete system, including profiles, glass, hardware, gaskets, locking, drainage, fabrication quality, tested performance, installation and after-sales support.

The specification should also consider project location, opening size, building height, wind load for windows, rain exposure, external noise, security and thermal comfort.

No. Two aluminium windows may look similar but perform differently because of differences in system design, hardware, glass, gaskets, drainage, fabrication and installation.

Window performance depends on how all these components work together as a complete system—not simply on the aluminium profile.

Start with the architectural and performance requirements of the home. When selecting premium aluminium windows, consider opening dimensions, sliding or casement configuration, glazing area, wind exposure, rain, external noise, security and thermal comfort.

For larger openings, the aluminium sliding windows, glass and hardware should be evaluated as one complete system.

There is no single aluminium window price per sq. ft. in India that applies to every project. Pricing depends on the system, opening type, dimensions, glass specification, hardware, finish and installation requirements.

For premium aluminium windows, comparing the complete project specification is more meaningful than comparing only a generic per-square-foot rate.

Both aluminium and uPVC windows can suit different applications. For large openings, slim sightlines and contemporary architecture, aluminium offers high structural strength and can accommodate larger glazing configurations.

When comparing aluminium vs uPVC windows, also consider opening dimensions, design requirements, weather exposure, glass, hardware, maintenance and expected lifespan.

The better choice is the system that meets the architectural and performance requirements of your project—not simply the material with the lower initial price.

There is no single aluminium window price per sq. ft. in India because specifications vary significantly between projects.

The cost of premium aluminium windows depends on the selected system, opening type, dimensions, glass specification, hardware, locking, finish, performance requirements and installation complexity.

A large sliding window with performance glazing cannot be accurately compared with a small fixed window using only a per-square-foot rate. Compare the complete installed specification and long-term performance, not just the initial price.

The aluminium door price in India depends on the door type, dimensions, aluminium system, glass specification, hardware, locking mechanism, finish and installation requirements.

Sliding doors, hinged doors and large-format glazed doors can have very different specifications and therefore different costs.

For premium aluminium doors, a project-specific quotation based on architectural drawings, opening dimensions and performance requirements provides a more accurate estimate than a generic per-square-foot price.

Schüco aluminium windows and doors are engineered as integrated systems in which profiles, hardware, gaskets, glazing and other components are designed around defined configurations and applications.

Lumani has been associated with Schüco since 2012, combining Schüco systems with project-specific engineering, fabrication, installation and after-sales service.

For architects and homeowners, the important consideration is not only the profile brand but how the complete aluminium window system is specified and executed.

Yes. Lumani Systems has been associated with Schüco since 2012, delivering Schüco aluminium windows and aluminium doors supported by system selection, engineering, fabrication, installation and after-sales service.

There is no single Schüco aluminium window system suitable for every project.

The appropriate system depends on opening dimensions, architectural design, application, glass requirements, building height, wind conditions and expected performance. The system should therefore be selected around the specific requirements of the project.

Schüco aluminium windows and doors are developed as integrated systems in which profiles, hardware, gaskets and other system components are designed around defined applications and performance requirements.

However, the final window performance also depends on correct system selection, glass, fabrication and installation.

Lumani combines Schüco systems with project-specific engineering, fabrication, installation and long-term service.

Air tightness indicates how effectively closed aluminium windows restrict uncontrolled air leakage.

Performance depends on frame design, gaskets, hardware, glass, fabrication and installation. Better air control can contribute to improved indoor comfort, acoustic performance and cooling efficiency.

High-performance aluminium windows can be designed for strong water-tightness performance, but the result depends on the complete system rather than the profile alone.

Achieving water-tight aluminium windows requires appropriate drainage, gaskets, sealing, fabrication and installation. Project-specific rain exposure, wind pressure and opening dimensions should also be considered.

Yes, aluminium windows can be suitable for Indian weather conditions when the system is selected according to the project's location and exposure.

Indian buildings can experience intense heat, dust, monsoon rain, humidity and varying wind pressures. The aluminium profile alone does not determine performance. Glass, gaskets, drainage, hardware, fabrication, sealing and installation must work together.

For this reason, premium aluminium windows in India should be specified according to actual site conditions rather than selected only for appearance.

Yes, aluminium systems can be used for high-rise buildings, but the window must be engineered for the project's wind load, opening dimensions, glass weight, building height and exposure conditions.

Wind load for windows becomes increasingly important as building height and exposure increase. The aluminium system, glass, hardware, anchoring and installation should therefore be evaluated together before the specification is finalised.

The best aluminium windows for large openings depend on the opening dimensions, glass weight, wind load, desired operation and architectural requirement.

Large aluminium sliding windows and doors are often considered where expansive glazing and uninterrupted views are important. However, the selected system must be capable of supporting the proposed sash dimensions and glazing.

For large openings, system capacity should be verified before the architectural design is finalised—not after.

Neither is universally better.

Aluminium sliding windows are useful for large openings and spaces where projecting shutters may not be desirable. Casement windows operate on hinges and can offer a different sealing and ventilation configuration.

The right choice depends on the opening size, room function, ventilation, architecture and required air, water, acoustic and wind performance.

The best aluminium windows for noise reduction combine an appropriate window system with correctly specified acoustic glazing, effective gaskets, sealing and professional installation.

Simply increasing glass thickness does not automatically create a better acoustic window. The complete assembly—including the surrounding wall and installation interface—affects real-world sound reduction.

For high-noise locations, acoustic requirements should ideally be identified before selecting the aluminium system and glass.

Wind load for windows indicates the wind pressure that a window and its glazing may need to withstand.

Building height, project location, opening dimensions and exposure conditions can influence wind pressure. Selecting the appropriate aluminium window system, glass and configuration helps reduce the risk of excessive deflection, deformation and wind-related noise.

Properly designed aluminium windows can significantly reduce outside noise, although acoustic performance depends on the complete assembly.

Depending on the profile system, glass and building construction, acoustic insulation can range from approximately 30 dB to 52 dB. Effective soundproof aluminium windows require the glass, gaskets, sealing, frame system, fabrication and installation to work together.

The right glass depends on project location, orientation, window size, solar exposure, external noise, security requirements and desired indoor comfort.

Depending on the application, premium aluminium windows may incorporate toughened, laminated, insulated, solar-control or Low-E glazing.

A Double Glazed Unit (DGU) consists of two panes of glass separated by a spacer.

DGU can contribute to thermal insulation and acoustic performance when combined with an appropriate aluminium window system. Actual performance depends on the glass combination, cavity, coating, frame system and complete window specification.

DGU and laminated glass serve different purposes.

DGU glass can contribute to thermal and acoustic performance, while laminated glass can be specified for safety, security and acoustic requirements.

The appropriate glass for premium aluminium windows and doors should be selected according to the project's actual performance requirements.

Low-E glass for windows has a low-emissivity coating designed to help control heat transfer through glazing.

When correctly specified, Low-E or solar-control glass can contribute to energy-efficient aluminium windows. Selection depends on orientation, climate, glazing area, solar exposure and required thermal performance.

U-value measures the rate of heat transfer through a window or building component and is expressed in W/m²K.

Generally, a lower U-value indicates better thermal insulation. When choosing energy-efficient aluminium windows, evaluate the complete window and glazing configuration rather than the glass alone.

Correctly specified energy-efficient aluminium windows can help manage unwanted heat transfer and air leakage, potentially reducing the cooling load on a building.

Actual energy consumption, however, also depends on glass specification, orientation, shading, glazing area, building envelope and HVAC performance.

Jumbo glass refers to extra-large glass panels used for expansive views and larger glazed openings.

When planning jumbo glass with large aluminium sliding windows or doors, factors such as dimensions, weight, wind pressure, transportation, site accessibility, installation and future replacement should be considered.

There is no single glass specification that is best for every aluminium window.

Glass should be selected according to window dimensions, solar exposure, orientation, external noise, safety, security and thermal requirements. Depending on the application, options may include toughened glass, laminated glass, DGU, solar-control glass or Low-E glass for windows.

The glass and aluminium system should always be evaluated together as one assembly.

Single glazing uses one pane of glass, while Double Glazed Units (DGU) use two panes separated by a cavity.

Double glazing can provide better thermal and acoustic performance when appropriately specified. However, performance also depends on glass type, coatings, cavity configuration, aluminium system and installation.

For energy-efficient aluminium windows, DGU can be valuable where the project's thermal or acoustic requirements justify it—but double glazing should not be selected simply because “double must be better.”

Properly specified energy-efficient aluminium windows can help control solar heat gain, heat transfer and uncontrolled air leakage.

Performance depends on the combination of the aluminium system, glazing, Low-E or solar-control glass, U-value, SHGC, sealing and installation. Building orientation, shading and total glazing area also affect cooling demand.

Windows should therefore be treated as part of the building envelope rather than as an isolated product.

A thermal break aluminium window uses an insulating material between the internal and external aluminium sections to reduce direct heat transfer through the frame.

This can improve the thermal performance of the window, particularly when combined with appropriate glazing such as DGU or performance glass.

Whether a thermal-break system is required should be determined by the project's climate, glazing area, orientation and required thermal performance.

Leakage can occur because of inadequate drainage, blocked tracks, incorrect sealing, fabrication issues, poor installation or a system unsuitable for the site's exposure conditions.

Achieving water-tight aluminium windows requires system design, fabrication, drainage, sealing and installation to work together.

Many aluminium sliding windows have drainage paths designed to manage water entering the outer track area.

Problems can occur when drainage openings become blocked, tracks are incorrectly fabricated or installation prevents water from draining properly.

Difficult operation can result from dirty tracks, alignment issues, roller condition, hardware adjustment, sash weight or installation-related problems.

Correct system selection and periodic aluminium window maintenance help maintain smooth operation.

Because the aluminium profile is only one component of the finished window.

Incorrect measurements, unsuitable glass, fabrication tolerances, hardware adjustment, drainage, anchoring, sealing or poor aluminium window installation can compromise performance.

This is why system selection, fabrication and installation should be treated as one process.

Ideally, aluminium windows and aluminium doors should be planned during the architectural and construction design stage rather than after openings are already complete.

Early planning helps coordinate opening dimensions, sill conditions, façade interfaces, glass specifications and window configurations.

Difficult operation can result from dirty tracks, roller wear, alignment problems, hardware adjustment, excessive sash weight or poor installation.

Correct system selection, installation and periodic aluminium window maintenance help maintain smooth operation.

Premium aluminium windows and aluminium doors can incorporate security features such as laminated safety glass, multipoint locking, key locking, internal glazing beads and burglar-resistance configurations, depending on the selected system.

Security should be evaluated as a combination of glass, locking, hardware and system design.

Aluminium windows and doors are available in architectural finishes including plain, textured, sparkling and wood-effect options.

Colours can include grey, black, dark wenge, walnut and other project-specific shades, allowing the window finish to coordinate with the façade and interior design.

Premium aluminium windows and doors can incorporate laminated safety glass, multipoint locking, key locking, internal glazing beads and other security configurations depending on the selected system.

Security depends on the complete combination of glass, locking, hardware, frame and installation, not simply the strength of aluminium.

Premium aluminium windows are generally low-maintenance, but periodic cleaning and inspection are important.

Good aluminium window maintenance includes keeping tracks and drainage channels clean and periodically checking gaskets, handles, rollers, locks and moving hardware.

Lumani provides different warranty periods for different components:

• Profiles & coating: 10 years
• Accessories & hardware: 3 years
• Glass: 1 year for specified white dots and bubbles; breakage excluded
• Stainless Steel 304 Grade Mesh: 10 years against corrosion

Accidental damage and other specified exclusions apply. Your supplied warranty material separates coverage by component rather than applying one identical period to the complete assembly. Pasted markdown

Warranty coverage may be affected by unauthorized modifications, third-party alterations, misuse, improper maintenance, chemical exposure, structural movement, security-system interference or non-recommended cleaning practices.

Following recommended aluminium window maintenance procedures is therefore important for maintaining applicable warranty coverage.

Accidental damage is excluded where specified. Glass breakage is not covered under the stated glass warranty.

The 1-year glass warranty covers specified white dots and bubbles, subject to the applicable warranty conditions.

Yes. Lumani provides after-sales service for aluminium windows and doors after installation and project handover.

For reported service requirements, the team aims to respond within 48 hours and resolve the issue within the following 7 working days, subject to the nature of the service requirement and availability of required components.

Well-designed and properly installed aluminium windows are intended for long-term use, but there is no responsible single lifespan figure that applies to every installation.

Actual service life depends on system quality, environmental exposure, usage, fabrication, installation and maintenance.

Lumani's approach is specifically built around long-term operability, preventive checks, process-controlled execution and after-sales accountability rather than treating project handover as the end of the relationship.

Yes. Premium aluminium windows are generally low-maintenance, but low maintenance does not mean zero care.

Tracks and drainage channels should remain clean, while gaskets, rollers, handles, locks and moving hardware should be inspected periodically. Appropriate cleaning methods should also be followed to protect the finish and system components.

Lumani's brand philosophy specifically emphasizes systems designed to stay aligned, stay silent and stay functional with minimal upkeep.