Windows play a bigger role in home energy performance than most people realise. The right glazing, frame material, and orientation can reduce heating and cooling loads significantly, while the wrong choice can increase your HVAC costs for years. In this blog, we explain how energy-efficient windows affect thermal performance, how they influence HVAC sizing, and what to consider during the design phase. If you are drafting a new home or planning a renovation, this information will help you make better design decisions from the start.