You can be living in a house and have a zoned system and never actually know how or why it’s set up the way it is. They go to their thermostat and set it at whatever temperature is comfortable for them, and that’s the extent of their knowledge. I ask people “How much do you know about your system?” More often than not, the answer is “I don’t know anything.” Most people don’t understand the way their HVAC works. Two trunks are controlled by the thermostat upstairs, the others are controlled by the thermostat downstairs. One of the trunks feeds upstairs, and the others feed downstairs. If your home is built for zoning, you might have two trunks coming off of the front of the furnace, and two off of the back. Close the damper halfway or three quarters so a little bit of air is going in there. It’s not that big a deal if you close dampers in rooms that are used only three weekends a year, when family or friends come to visit. Most people close dampers because they want more airflow to a specific area. You can breathe, but it’s much easier to breathe without the mask. High static pressure is like running a marathon while wearing a mask. The furnace has to overwork to compensate for that. High static pressure also means you’re not getting enough return air to the furnace. It puts stress on the blower motor because it’s trying to move air that isn’t moving as freely. High static pressure can lead to other issues. The main detriment is that it causes high static pressure. And the main street is jammed with traffic. So now there’s more traffic in that neighborhood. Is it getting stuck? Is it going down another neighborhood road? Is it where it’s trying to go? If you try to turn down one road, and it’s closed, then try to turn onto another road, and that one is closed, you can understand what happens to the traffic on the main road. If you start closing off all of the neighborhood streets, the traffic gets congested.
Those neighborhood streets are the supply runs that have the dampers in them. Off of the main streets, you have neighborhood streets. So you take the largest volume of air and split it in two directions. Then, surface roads such as High Street are the trunk lines. The highway is the supply plenum coming out of the top. After all, your ducts are very similar to roads. If you close the vent for that room, that forces the air - at least some of it - to another room that might be a little chilly.īut let us consider traffic patterns. After all, isn’t it a waste of money to heat something that no one can enjoy? For instance, if you’re dumping heat into a room that no one is using, it makes sense to cut off that room’s source of heat. This article will explore these questions, address some of the situations in which closing a vent causes more harm than good, and the underlying issues of closed vents.Ĭlosing an air vent (or two) may solve problems. How many? For how long? Why? Is there a better solution? But it’s not recommended, especially if you close multiple vents all of the way and keep them closed.Īnd there are caveats. The quick answer is, Yes, it is OK to close air vents.
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