Thermal Break vs Non-Thermal Break Aluminum Windows: Complete Comparison for Architects

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Thermal Break vs Non-Thermal Break Aluminum Windows: Complete Comparison for Architects<\/h2>\n\n

Choosing between thermal break vs non-thermal break aluminum windows<\/strong> is a critical decision for any architectural project. Thermal break windows use a polyamide barrier between interior and exterior aluminum profiles to reduce heat transfer, while non-thermal break windows are a single continuous aluminum extrusion.<\/p>\n\n

As a general rule: thermal break windows are required for air-conditioned buildings in temperate or cold climates, while non-thermal break windows may be suitable for non-air-conditioned spaces in mild climates. Runheng manufactures both types, with our NH series thermal break systems widely used in Hong Kong and international projects.<\/p>\n\n

Key Differences<\/h2>\n\n

Thermal Performance<\/h3>\n

Thermal break:<\/strong> U-value typically 2.0-3.5 W\/m2K depending on configuration. The polyamide strip (typically 14.8mm to 34mm) interrupts the thermal bridge, significantly reducing heat loss through the frame.<\/p>\n

Non-thermal break:<\/strong> U-value typically 5.0-6.5 W\/m2K. Without the thermal barrier, the aluminum frame conducts heat freely between interior and exterior.<\/p>\n\n

Condensation Resistance<\/h3>\n

Thermal break:<\/strong> Significantly better \u2014 the interior surface temperature stays closer to room temperature, reducing condensation risk in humid conditions.<\/p>\n

Non-thermal break:<\/strong> Higher condensation risk in cool weather as the interior frame surface can become cold enough to reach dew point.<\/p>\n\n

Cost<\/h3>\n

Thermal break:<\/strong> 20-40% more expensive due to the additional polyamide strip, specialized assembly process, and more complex extrusions.<\/p>\n

Non-thermal break:<\/strong> Lower initial cost, suitable for budget-conscious projects in mild climates.<\/p>\n\n

Structural Performance<\/h3>\n

Both types can achieve similar structural ratings. The thermal break does not significantly affect load-bearing capacity when properly designed. Runheng NH series thermal break windows have been tested for wind loads up to 3.0 kPa.<\/p>\n\n

When to Choose Thermal Break<\/h2>\n

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  • Air-conditioned buildings in temperate or cold climates<\/li>\n
  • Projects with energy efficiency requirements (LEED, BREEAM, Green Mark)<\/li>\n
  • Buildings near coastlines or in high-humidity environments<\/li>\n
  • Any project where interior condensation would cause issues<\/li>\n<\/ul>\n\n

    When Non-Thermal Break May Suffice<\/h2>\n

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