Block off vents in tall room?
Just bought a new home and have a heating issue with the great room/living room. I'll try to explain without boring you to death.
First the room:
1. When running the first floor heater it can take awhile to heat this room.. no real mistery there. But all the all heat from this room ends upstairs in the hall way and sometimes 4 bedrooms if the doors are open. So by the time this room gets confy (70 degrees) the upstairs can be a balmy 76 or 78 degrees. I set it to 66-67 when we go to bed at night but sometimes wake up sweating when it turns on.
2. If the bedroom doors are shut upstairs, the rooms can get extra cold since the halway (where the thermostat is) stays warm and never turns on to heat the rooms.
Would it be ok to block the vents in the tall room during the winter? I think this would be only needed during the winter aynway since during the summer the air would be staying on the first floor. Would this hurt the system in anyway?
You limited your focus on just one room in your house when the base problem is with the entire house when it comes to how your HVAC systems work together.
Closing off the registers in the large room will causes changes in the first floor system's operation. Not all of them good. Depending on where the thermostat is located for that system you may or may not help the problem at all.
Dual system homes with open common areas that cause chimney effects with the air movements are hard sometimes to resolve. Most of the ability to make things a lot better all depends on the original installation and layout.
The first thing I'd suggest is a test to see if the simplest of things can help. Turn both system fans to "on" instead of "auto" and allow them to run continuously 24/7. This sometimes can minimize the chimney effect that you're experiencing. I stress the sometimes.
The other thing that would help in this instance would be a drawing showing the home, rooms, register locations (both supply and returns) and where the thermostats are located.
How about a couple of ceiling fans to blow that heat down? Try the fan on all time option and then install ceiling fans
Here are a couple of photos that may help
First image is looking back at the kitchen. The return is in the formal dinning room that is beyond the archway I have labled.
You can also see that upstairs hallway is almost right above the registers.
This next photo shows the third register which is right above the stairs.
I am wondering what running the fans all day will do? Does it wear out the system faster? does it run up my electric bill?
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