So should I open or close basement supply?!

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  #1  
Old 12-07-17, 05:44 PM
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So should I open or close basement supply?!

See im totally confused by this. I have a return and a supply in my basement (finished) but if I open up the supply vent in the basement it absolutely destroys air flow upstairs. Like hardly will come out compared to that vent being closed. Why?!

Am I actually better keeping that vent open even though it destroys air flow on first floor?! Im assuming my furnace (gas forced hot air) would run longer/come on more often because the thermostat is upstairs where now the airflow would be a lot less? Btw all my supplies come through the ceiling on the first floor. Am I actually spending more energy this way too(basement closed.) Btw there is a closed door that seperates basement and first floor (single story L Ranch)

Ive heard so many conflicting things on what I should do.(including here)Someone please enlighten me!
 
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Old 12-07-17, 06:28 PM
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How much heat do you need in the basement ?
Instead of opening the vent all the way...... open it partially.
Allow it to heat the basement gradually.

My basement is below ground and I don't have any open supplies to it. Being below ground it stay pretty warm. I have one that can be opened if needed but rarely, if ever, gets opened. Absolutely nothing is open in the basement in the summer time.
 
  #3  
Old 12-07-17, 07:37 PM
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Not a lot of heat. Itís around 62 right now. But closing it wonít create a negative pressure? I have a return down there as well. Also was curious if it was bad for my system?

Thanks!
 
  #4  
Old 12-08-17, 04:49 AM
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There is no bad, it's just balancing the air flow.

If you dont spend a lot time in the basement then close the register, you want to put heat where people are.
 
  #5  
Old 12-08-17, 05:40 AM
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Thanks! I will play around with the damper a bit and figure out a happy medium. Its just that the supplies come through the ceiling upstairs so was wondering if itd be worth to send more downstairs
 
  #6  
Old 12-08-17, 11:59 AM
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I open up everything in the basement in the winter and everything upstairs in the summer. Conversely, I'm closing two or three vents on the other floor during those seasons to balance.
 
  #7  
Old 12-08-17, 01:57 PM
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Thanks. Yea I donít really use the basement much. I go down on the computer a few times a day but thats it. In the future when the kids are older I will use it more. I was just under the heat stack effect would make a difference.

No Im asking a million questions but since thermostat is upstairs (in the warmest part of the house in a hallway) would I maybe better opening the basement vent and getting lower flow upstairs, causing it to run a bit longer? Just trying to think of all scenarios where everything is actually pleasant feeling.
 
  #8  
Old 12-12-17, 12:41 PM
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That's the idea - my thermostat is upstairs so by closing some of the vents up there, the furnace has to run longer because a greater percentage of the air is now being dumped downstairs.
 
  #9  
Old 12-13-17, 07:41 AM
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Personally I'd cover most of the basement return as well. To insure you have good draw upstairs.
 
  #10  
Old 12-24-17, 03:54 AM
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I live 30+ miles north of Pittsburgh, Pa. and I too have a finished basement. My basement is used year round as a play/work area. My house is a single story with about 2000 sq. ft. on the first floor. I run the furnace fan 24/7 and have run it for 20+ years that way. It has a multi speed fan that runs on the lowest speed for continuous air circulation , medium speed for heating and high speed for A/C. In the winter I open all 6 supply registers and close them in the summer. I also have 5 return grills that stay open all the time. The temperature is always slightly cooler in both the winter and summer. By continuously circulating the air in both floors all areas stay fresh and none get that stale air smell. The door separating the basement from the first floor can be open or closed with no noticeable difference. Now, I am not sure why when you open 1 supply register it would affect the main floor air flow that greatly but it may be time to seek professional help, or maybe utilizing different fan speeds if available for different modes of operation. This works for me and may give you something to consider. Everyone gives you their advice. this is what I do and may help you decide what to do.
 
  #11  
Old 12-24-17, 01:59 PM
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"...I am not sure why when you open 1 supply register it would affect the main floor air flow..."

It is because all too often forced air systems are not designed, just thrown into a house plan as an afterthought. This is often compounded by the builder who often will move ducts or registers to be able to fit in some other part of the construction. Sometimes it goes so far as making a duct smaller just so it will fit.
 
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