System Window and Door Buying Guide ：

1. Material Selection ：

• Aluminum profiles Choose virgin aluminum profiles to ensure that hardness, toughness, and strength meet the required standards. The 6-series virgin aluminum is recommended for its excellent cost-performance ratio. The wall thickness of aluminum profiles should be at least 1.8 mm according to national standards—preferably 2.0 mm—to guarantee stability.

• Glass Choose single-layer, double-layer, or triple-layer insulated glass based on your needs. Original glass from premium brands such as South Glass, Xinyi, and Taiwan Glass is more reliable; be sure to verify that the glass carries the 3C certification. Triple-layer insulated glass or laminated glass offers superior soundproofing and thermal insulation performance. For areas with intense sunlight, you can opt for LOW-E glass.

• Hardware accessories The quality of hardware components directly affects the lifespan of doors and windows. We recommend imported brands such as Belgium’s Sogebau and Italy’s Geze, or well-known domestic brands, to ensure long-lasting durability.

2. Performance evaluation ：

• Thermal and sound insulation It is measured by indicators such as the heat transfer coefficient, air-tightness rating, and water-tightness rating. Performance can be enhanced by filling hollow glass with inert gases (such as argon), using PA66 thermal breaks, and employing EPDM sealing strips.

• Waterproof and windproof Check the quality of the sealing strips (EPDM rubber) and thermal break strips (PA66) to ensure that they meet the required standards for watertightness and wind-pressure resistance.

3. Design style ：

• Overall coordination The design style should be consistent with the decoration style; you can find matching styles whether it’s modern minimalist or European classical.

• Detailed design Consider the window sash opening method (outward-opening, inward-opening, sliding, etc.), color options (with different colors for the interior and exterior), and narrow-frame design (which provides better visibility and daylighting).

4. Price comparison ：

• Cost-effectiveness The prices of system windows and doors vary depending on factors such as materials, performance, and brand. Economy-grade models (500–800 yuan/㎡) are suitable for users with limited budgets; mid-range models (800–1800 yuan/㎡) offer superior performance; and custom-made models (over 2000 yuan/㎡) are ideal for users with extremely high quality requirements.

• Avoidance Tips Be vigilant against the abusive use of the “system window” concept and demand that merchants provide inspection reports. Avoid traps involving low-priced marketing followed by exorbitant markups; clearly specify the costs of auxiliary materials such as hardware and seals. Conduct on-site dimension verification to prevent inflated area calculations.

5. Installation and After-Sales Service ：

• Professional installation Ensure that the supplier provides professional installation services, as installation quality directly affects the performance of doors and windows.

• After-sales service Understand the warranty policy and prioritize brands that offer warranties for entire windows—this way, you can feel more confident in your choice.