For us, the problem wasn’t the windows at all — it was the ducts. After scheduling a service to improve indoor air quality, the team found old dust and even bits of construction material stuck inside the system. The difference after cleaning was incredible. Instead of that heavy, stale air, the house felt light and breathable again. Even my partner, who usually doesn’t notice these things, kept saying how much better the place felt. It was such a relief to finally solve the issue.