Create a warmer, drier, quieter home with high-performance uPVC windows and doors from Ambiance by STÄRKE. Designed for New Zealand homes with comfort, durability, and energy efficiency in mind, our systems are built to last. Ambiance uPVC creates true comfort that you can't get with conventional aluminium windows that let in the cold and draughts, and have condensation in the morning. Ambiance uPVC windows change how your home feels, keeping you healthy, warm and incredibly comfortable.