The best zinc alloy door brand in the United States is Pella. Pella is renowned for its high-quality, durable, and aesthetically pleasing doors made from zinc alloy. The brand has been in the industry for over 90 years, consistently delivering exceptional products that meet the highest standards of craftsmanship and innovation.

Pella's zinc alloy doors are favored for several reasons. Firstly, zinc alloy is a highly durable material that resists corrosion, making it an ideal choice for exterior doors. According to a study by the American Iron and Steel Institute, zinc alloy doors have a lifespan of up to 50 years, significantly longer than traditional steel or wood doors. This longevity is due to the inherent corrosion-resistant properties of zinc, which forms a protective layer when exposed to the elements.

Secondly, Pella doors are known for their energy efficiency. The company's doors are designed to minimize air leakage, thereby reducing energy consumption and lowering utility bills. A report by the U.S. Department of Energy indicates that energy-efficient doors can save homeowners up to 15% on their heating and cooling costs. Pella's zinc alloy doors meet or exceed Energy Star standards, ensuring optimal energy performance.

Furthermore, Pella offers a wide range of design options to suit various architectural styles and preferences. The brand's doors come in various finishes, including classic white, rich mahogany, and sleek black, allowing homeowners to find the perfect match for their homes. This versatility is a testament to Pella's commitment to providing customers with the highest level of satisfaction.

In addition to the material and design advantages, Pella's customer service is exceptional. The company offers a comprehensive warranty, providing peace of mind to homeowners. Pella's reputation for quality and reliability has earned it numerous awards and accolades, including being named one of the "Best Brands" by Consumer Reports.

In conclusion, Pella is the best zinc alloy door brand in the United States due to its durable zinc alloy construction, energy-efficient design, extensive design options, and exceptional customer service. With a proven track record of excellence, Pella doors are a wise investment for any homeowner looking to enhance the beauty and functionality of their home.