I’ve recently had my HVAC system checked and the technician also stressed the importance of proper return airflow. It’s something that often goes unnoticed, but it really plays a critical role in how efficiently the whole system operates. I guess it's not just about heating or cooling — it’s about air balance, which is easy to overlook. Thanks for the insights and resources shared above.

The idea that closing vents to unused rooms will save energy seems logical, but it can actually do more harm than good. When return air is restricted or imbalanced, your HVAC system has to work harder to maintain temperature, which can lead to inefficiencies and even equipment wear over time. A helpful resource I found is this article: https://blendspace.com/can-closing-vents-to-unused-rooms-actually-save-energy/. It clearly explains how blocking vents can increase pressure in the ducts, making the blower motor work harder and potentially reducing airflow overall. What’s more, when return air paths are disrupted, it can lead to hot and cold spots around the house. So instead of saving energy, you might actually see your energy bills go up. It's better to focus on proper zoning or optimizing return air pathways.