Lang Exterior appears to have a strong reputation based on recent customer reviews. Their windows and doors are frequently praised for their quality, efficiency, and aesthetic appeal. These products seem to serve a range of clients, from homeowners to professional remodeling contractors, with some customers displaying loyalty over decades. The company’s customer service, and specifically service representatives such as Tim, Beth, and Theresa, are frequently recognized for their competence and dedication to customer satisfaction. However, there is an isolated incident where a consumer faced issues with condensation, frost, and drafts due to potentially lower-quality products installed by a third-party contractor. Overall, the recurring themes in the feedback are high-quality products that contribute to energy efficiency and an exceptionally patient and customer-centric service experience.