Energy Efficiency Windows And Doors

DERCHI thermal-break aluminum windows and doors are engineered as complete energy systems, combining insulated glazing with high-performance thermally broken frames to reduce heat transfer, lower heating and cooling loads, enhance indoor comfort, and support code-compliant buildings across a wide range of residential and commercial climates.

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System-level energy performance, not just glass specs.

Thermal-break aluminum frames optimized for U-Factor and SHGC targets.

Validated air, water and wind resistance for demanding projects.

Configurable glazing packages for different climate zones and orientations.

Technical support for ENERGY STAR®, NFRC and high-performance building goals.

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Energy-Efficient Thermal-Break Aluminum Systems

Energy efficient windows and doors do not rely on glass alone. DERCHI thermal break aluminum windows and doors combine insulated glazing, engineered frames, sealing, drainage, and correct installation to help reduce energy use and improve comfort.

Whole-window energy logic

When you replace old units, you replace a full system, not a single part. Performance comes from insulated glass, thermal break aluminum frames, multi-chamber profiles, sealing gaskets, drainage paths, and installation working together as one. This system approach is what makes a window or energy efficient door reach Energy Star–level performance, instead of only changing to “better glass.”

Insulated glass and key ratings

DERCHI systems use double tempered glass such as 5+27A+5, often with argon gas, warm-edge spacers, and Low-E coatings to control heat loss and solar gain. These choices improve U-factor, solar heat gain coefficient (SHGC), condensation resistance, and sound control. Our catalogs list full tested data for each series, so you can read and compare U-factor, SHGC, air leakage, water tightness, wind resistance, and sound insulation before you choose.

Thermal-break aluminum frames

Thermal break aluminum windows and doors use thicker profiles than many basic products, often 1.8–2.0 mm, with 35–44 mm insulation strips and multi-cavity sections. Some systems can be filled with insulation material to cut heat flow through the frame. Profile geometry and “isotherm” design help keep interior surfaces warmer and more stable, which supports overall energy efficient windows and doors performance.

Sealing, drainage and installation quality

Triple-seal structures, EPDM gaskets that swell when wet, and continuous foam gaskets reduce air and water paths around the sash and frame. Hidden or pressure-equalized drainage and glued corner connectors help manage rain and wind load at the frame joints. Correct installation then ties the window or door to the wall, so the tested performance in the lab is close to what you see in your home or project.

Why upgrade from old windows and doors

Compared with single glass, non-thermal break frames, and weak seals, DERCHI thermal break aluminum systems lower energy use and reduce drafts, cold spots, condensation, and leaks. They help keep indoor temperatures more stable in both hot and cold seasons. With a clear view of ratings and system design, you can select the right DERCHI energy efficient windows and doors for different climates, building types, and budget levels.

How Do I Know If a Thermal-Break Aluminum Window

or Door Is Energy Efficient?

When you choose DERCHI thermal break aluminum windows and doors, use verified performance data instead of glass type alone. Energy efficient windows and doors rely on certified whole-unit ratings plus a well-designed aluminum frame, sealing and drainage system to manage heat flow and drafts.

Independent Ratings and Certifications

Start with independent labels. An energy efficient door or window should carry test data from bodies such as NFRC and comply with local energy codes. In many regions, ENERGY STAR windows set a clear benchmark for energy efficient windows and doors.

Read the NFRC label for U-Factor and Solar Heat Gain Coefficient (SHGC).

Confirm whether the product meets local ENERGY STAR windows criteria where applicable.

Focus on whole-unit ratings, not center-of-glass values only.

Use these labels to compare thermal break aluminum windows and doors across brands.

System-Level Performance, Not Just Glass

With thermal break aluminum systems, the same glass can deliver different results in different frames. Thermal breaks, cavity design, wall thickness and sealing details all affect the final U-Factor, air tightness and water tightness of the complete unit.

Review U-Factor and SHGC for the entire window or door, including frame and sash.

Look for wider thermal breaks, multi-chamber aluminum profiles and optional insulation inserts.

Check certified test reports for air tightness, water tightness and wind pressure resistance.

Confirm multi-layer seals, quality EPDM gaskets and a pressure-equalized drainage design.

Compare these whole-unit values to choose the most energy efficient door and window solution for your project.

Key Energy Efficiency Terms You Should Know

Understanding these terms makes it easier to compare DERCHI energy efficient windows and doors, read performance labels, and see how thermal break aluminum windows and doors relate to programs such as ENERGY STAR windows and an energy efficient door for your project.

Glazing Performance Terms

U-Factor:

Heat flow rate through the whole window or door unit. Lower U-Factor means better insulation and lower heating and cooling load.

Solar Heat Gain Coefficient:

Fraction of solar heat that passes through the glazing. Lower SHGC cuts unwanted summer heat gain; higher SHGC can support passive solar gain in cold climates.

Low-E Coatings:

Thin metal layers on the glass surface that reflect infrared heat while allowing light to pass. Different Low-E types balance solar control, glare and daylight.

Low-E Coatings:

Thin metal layers on the glass surface that reflect infrared heat while allowing light to pass. Different Low-E types balance solar control, glare and daylight.

Insulated Glazing Units:

Two or more panes of glass separated by a sealed cavity with spacers and edge seals. IGUs reduce heat transfer and noise compared with single glass.

Gas Fills:

Inert gas inside the IGU cavity that slows heat transfer more than air. Gas fills help lower U-Factor and reduce condensation risk on the glass edge.

Thermal-Break Aluminum Frame & System Terms

Thermal Break:

Non-metallic strips that separate the inner and outer aluminum profiles. They cut conductive heat flow through the frame and support stable interior surface temperatures.

Profile Wall Thickness & Cavity Design:

Aluminum wall thickness and the number and layout of internal cavities. Thicker walls and multi-chamber designs improve strength, wind resistance and thermal performance.

Frame Depth & System Design:

Overall depth of the frame and sash, including space for glass and cavities. Deeper frames can hold thicker IGUs, wider thermal breaks and more insulation chambers.

Warm Edge Spacers:

Spacer materials at the edge of the IGU with lower thermal conductivity than standard aluminum. They reduce edge heat loss and help limit condensation around the frame.

Gaskets & Weatherstripping:

Continuous EPDM or similar seals at contact lines between sash, frame and fixed lights. Multiple sealing lines improve air tightness, water tightness and real-world comfort.

Air Tightness / Water Tightness / Wind Resistance / Sound Insulation:

System-level test ratings for the complete window or door. Better air and water tightness cut drafts and leaks; higher wind resistance protects large openings; sound insulation (dB) supports quiet interiors in busy or high-rise locations. Together with U-Factor and SHGC, these metrics define how truly energy efficient windows and doors perform in daily use.

ENERGY STAR® and Climate-Oriented Design

ENERGY STAR® guidance and NFRC ratings give a clear framework for choosing energy efficient windows and doors. They help you see how thermal break aluminum windows and doors, energy star windows and each energy efficient door perform in real climate conditions.

Understanding ENERGY STAR and NFRC Ratings

ENERGY STAR® sets target ranges for U-Factor and SHGC by climate zone, so you can check if a product fits your region rather than rely on marketing claims. NFRC labels then provide tested U-Factor, SHGC and related data for the whole window or door, not just the glass.

DERCHI products carry NFRC-based U-Factor and SHGC values together with air tightness, water tightness, wind pressure and sound insulation figures, using double tempered insulating glass with argon gas and wide thermal breaks. This lets you compare energy efficient windows and doors across brands using one standard format before you decide on style or hardware.

Do I Need ENERGY STAR-Certified Products?

ENERGY STAR® certification is a useful reference, but it is not the only factor in system selection. The right specification also depends on climate zone, building orientation, window-to-wall ratio, opening size and glass configuration. Cold or mixed climates may focus on lower U-Factor and tight air control, while hot sunny climates often need lower SHGC and solar control glass.

Coastal, high-rise and typhoon-prone projects require higher wind pressure, air tightness and water tightness ratings from the frame and hardware, not only an ENERGY STAR® label. DERCHI uses project climate and facade conditions to recommend thermal break aluminum windows and doors, glass builds and system combinations that align with your energy efficient windows and doors strategy.

DERCHI Thermal-Break Aluminum Frame Technology

DERCHI thermal break aluminum windows and doors are built as full frame-and-glass systems. The thermal break, profile design and sealing work with insulated glazing to deliver energy efficient windows and doors for a wide range of projects.

How Thermal-Break Aluminum Reduces Heat Transfer

In a DERCHI system, the thermal break separates the inner and outer aluminum parts and extends the path for heat flow. Wide insulating strips, multi-chamber profiles and optional insulation inserts help lower frame U-Factor and support the glass package in meeting project targets.

PA insulating strips between interior and exterior aluminum profiles

Profile wall thickness and frame depth sized for strength and thermal control

Multi-chamber frame and sash designs to cut conductive heat transfer

Compatible with argon-filled insulated glazing and warm-edge spacers

Supports energy efficient windows and doors in cold, mixed and hot climates

Air, Water, and Structural Performance

Thermal break aluminum frames must also control air and water movement. DERCHI systems use engineered gaskets, multi-layer sealing and pressure-equalized drainage to maintain tested levels of air tightness, water tightness and wind resistance for each energy efficient door and window.

Three-layer sealing around frame, sash and fixed lights

EPDM gaskets, including swelling gaskets at exposed positions

Pressure-equalized drainage paths and protected outlet covers

Reinforced profiles and hardware layouts for high wind-load zones

System-level tests for U-Factor, SHGC, air, water and structural performance

Durability and Lifecycle

Long-term performance is part of DERCHI frame design. Aluminum alloys, coating systems,insulating strips, gaskets and spacers are selected to keep thermal and weather performance stable over the service life of the product, including for ENERGY STAR windows projects where long-term energy results matter.

Aluminum profiles with robust wall thickness for shape stability

Durable surface finishes, with options for powder and fluorocarbon coatings

EPDM and foam gaskets designed for ageing and UV resistance

PVDF-treated spacer bars to help resist discoloration at the glass edge

Verified performance through third-party testing for global markets

High-Performance Glazing Options for DERCHI Systems

DERCHI pairs insulated glass with thermal break aluminum windows and doors to build energy efficient windows and doors that fit different climates and building types. Low-E coatings, gas-filled cavities and spacer choices work with the frame to control heat gain, glare and comfort, and to support projects that target ENERGY STAR windows criteria where required.

Low-E Glass Combinations

DERCHI offers a range of Low-E insulated glazing units that balance U-Factor, SHGC and visible light.You can match the glass package to the climate, façade orientation and the performance target of each energy efficient door or window opening.

Glass package	Typical climate focus	Performance trend	Typical application
Double tempered IGU 5+12A/20A/27A+5 with argon	Mixed or mild climates	Lower U-Factor, moderate SHGC	Standard thermal break aluminum windows and doors
Single- or double-silver Low-E IGU with argon	Cold or mixed climates	Lower U-Factor, controlled solar gain	Living rooms, bedrooms, main façades
Low-E IGU with warm-edge spacer (optional)	Cold and high humidity zones	Improved edge temperature, reduced condensation	High-performance energy efficient windows and doors
Low-E IGU for curtain walls and large spans	Harsh sun or strong wind exposure	Lower SHGC, controlled glare	High-rise façades, commercial fronts

Triple Glazing, Laminated Glass and Safety

For projects that need stronger thermal, acoustic or safety performance, DERCHI can move beyond standard double glazing. Triple glazing, laminated glass and IGU-plus-laminate build a higher level of comfort and protection into the same frame platform.

Triple glazing options for cold climates and high-noise locations

IGU plus laminated pane for higher impact resistance and sound control

Multiple PVB interlayer thicknesses for different safety levels

Laminated or wired glass for guardrails, stair openings and overhead glazing

Sunroom and roof glazing packages that combine safety with thermal control

Technical Downloads for DERCHI Energy Performance

Download two brief technical guides on DERCHI thermal break aluminum windows and doors to support energy efficient windows and doors design.

Energy Standards：

Explains U-Factor, SHGC and air tightness, and how tested window and door data relate to codes, climate zones and ENERGY STAR windows.

Download Energy Standards PDF

System Performance：

Summarizes glazing options, thermal-break frames and configurations for windows and energy efficient doors in different project types.

Download System Performance PDF

Matching DERCHI Thermal-Break Solutions to Climate and Application

Different climates and building types need different thermal break aluminum windows and doors. By combining the right DERCHI system series with suitable glazing and sealing options, you can build energy efficient windows and doors that meet local code and support ENERGY STAR windows performance targets where required.

Cold and Heating-Dominated Climates

In cold or heating-led climates, the priority is to reduce heat loss and improve comfort near the window or door. DERCHI focuses on low U-Factor, triple glazing and wide thermal breaks for these projects.

Use triple-glazed systems such as K5N for main living spaces and bedrooms.

Select argon-filled insulated glazing with Low-E coatings to reduce conductive and radiant heat loss.

Combine wide thermal breaks and optional insulation inserts in frames and mullions.

Favour inward-opening casement and tilt-turn styles for strong air

Apply these packages to high-rise apartments and houses in cold or alpine regions.

Mixed Climates

Mixed climates need a balance between winter heat retention and summer solar control. Here the glass specification, shading and opening type should work together with the thermal break frame to keep conditions stable across the seasons.

Use double-glazed 5+27A+5 IGUs with Low-E for most façades.

Adjust SHGC with different Low-E types or built-in blinds for east and west orientations.

Choose inward-opening windows and energy efficient doors with strong air and water ratings.

Mix casement windows with sliding or folding doors for terraces and balconies.

Apply these solutions in temperate cities with both heating and cooling loads.

Hot and Cooling-Dominated Climates

In hot or cooling-led climates, the goal is to limit solar heat gain and manage strong wind and rain events, especially in coastal and typhoon zones. DERCHI thermal break aluminum windows and doors combine low SHGC glazing with robust sealing and drainage.

Use Low-E insulated glazing with low SHGC for sun-exposed elevations.

Select systems with EPDM swelling gaskets, multi-layer sealing and pressure-equalized drainage.

For coastal and high-wind areas, choose windows and energy efficient doors with high wind pressure ratings.

Use sliding windows and doors with anti-typhoon rollers and high/low track designs where space is tight.

Combine shading, such as overhangs or blinds, with glass selection to reduce cooling demand.

High-Performance and Sustainable Building

DERCHI thermal break aluminum windows and doors are designed as part of the building envelope,not as stand-alone products. By combining low U-Factor glazing, insulated frames and high air tightness, they help reduce heating and cooling loads and support truly energy efficient windows and doors in new build and renovation projects.

Whole-building energy performance

Triple or double insulated glazing, argon gas and wide thermal breaks lower heat transfer through the façade and help reduce HVAC demand.

Tested and certified values

NFRC-based U-Factor and SHGC data, together with air, water and wind ratings, give a clear basis for energy efficient door and window selection and for projects that target ENERGY STAR windows requirements.

Durability and lifecycle

6063-T5 aluminum profiles, robust wall thickness,fluorocarbon or powder coatings, EPDM gaskets and engineered spacers help keep thermal and weather performance stable over the service life of the building.

Comfort and indoor environment

High air tightness, strong water tightness and 30–37 dB sound insulation support stable temperatures, low drafts, reduced condensation and a quieter interior near windows and doors.

Ready for high-performance standards

System-level performance makes DERCHI energy efficient windows and doors suitable for low-energy, near net-zero and other performance-driven building designs in global markets.

Customized Solutions for Energy Efficient Windows and Doors

We design and configure energy efficient windows and doors around each project, not as a standard package. From structure to style and branding details, you can match thermal break aluminum windows and doors, every energy efficient door, and even ENERGY STAR® windows to your space, budget, and climate needs.

Structural and Style Customization for Unique Projects

We develop structural layouts and profiles that match your building type and performance targets. This helps you get the right look and the right energy performance in one plan.

Select frame depths and profiles for different wall types and insulation levels

Define opening types for each room: casement, tilt-turn, sliding or fixed units

Adjust mullion layouts to balance daylight, views, and wind load requirements

Combine thermal break aluminum windows and doors with other façade systems

Align section details with local installation methods and site conditions

Private Whole-Home Energy Solutions

We provide whole-home packages that link every window and door into one clear scheme. The focus is on comfort, simple operation, and lower heating and cooling demand.

Plan room-by-room window and door configurations for your full house or apartment

Match glass types and U-Factor / SHGC targets to each elevation and climate zone

Define energy efficient door solutions for entries, balconies, patios, and terraces

Coordinate shading, insect screens, and ventilation needs in one schedule

Prepare clear window and door lists to support design, quotation, and installation

Personalized Design, Colors, and Brand Elements

We support detailed design preferences so the system fits your brand and interior style while still meeting ENERGY STAR windows or similar targets.

Specify profile colors and surface finishes for interior and exterior sides

Customize glass selections: tints, Low-E types, patterns, and privacy options

Choose hardware styles and handle designs to match project aesthetics

Add logos or brand marks on glass, hardware, or accessories where needed

Align all visible details so every energy efficient window and door looks consistent across the project

Ready to Customize Your Project?

Align your energy efficient windows and doors with your floor plan, brand, and climate needs.

Choose a dedicated path for custom doors or custom windows.

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