On the surface, closing vents in unused rooms seems like a good way to save energy. But after doing some research, I found it’s more complicated than it looks. Closing vents can increase pressure in your HVAC system, which can actually reduce efficiency and even lead to damage over time. Your system was designed to move air throughout the entire house, and blocking part of that flow can confuse the thermostat and make the system run longer than necessary. I highly recommend checking out this resource:
https://blendspace.com/can-closing-v...y-save-energy/. It gives a really solid explanation of why this method might not save energy—and in some cases might even cost you more. Instead, it suggests alternatives like sealing duct leaks, improving insulation, and using a programmable thermostat. I followed some of those tips and noticed a steady drop in my energy usage.