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Cold basement in summer

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basement zone
2K views 3 replies 4 participants last post by  teddy bear  
#1 ·
Well summer is just around the corner and so my basement is getting cold again. How cold? 66-68F @ 54%RH. We keep the upstairs at 75F so it can be quite the shock moving between the floors. Is there any great way to deal with this?

- 1850 sq ft basement, back wall is half exposed w/windows facing WNW.
- In summer I run my fan 24x7 which does keep the temp around 68F
- When AC is running upstairs the basement goes down to about 66F
- I have a 2-zone system set up so that all ducts are open when AHU is in fan-only mode
- My fan wire is on the medium-low jumper. Heat is on medium jumper, AC is on high jumper
- I have low returns in all rooms of the basement
- I can feel some leakage of cold air in the basement ducts when AC is running. Looks like the seals on some dampers have come off. I'm working with my supplier to have this fixed.

It seems like there are really only 2 options
1) Run the fan on the medium or medium-high jumper

2) Run the heat in the basement zone


Is there any other way to deal with this? I've been tempted to try having the basement ducts stay closed all the time to see if I could draw more air from the basement returns and throw it upstairs (or vice versa) but it seems like that wouldn't work very well as it would force air to balance through the stairwell instead of equally mixing both floors in the return duct.


I realize there's no perfect solution but there's got to be a way to keep the temps a bit more even. Thanks!
 
#2 ·
Temperature stratification (warmer up and cooler down)... is what happens when anything other than a separate system for each level is used.

Having said this... sometimes... somtimes... a zoning system works... most of the time not.

Best approach is to be creative and experiment with it... you will 'stumble' onto something that works.
Problem is... because each house is unique... there is not a 'one size fits all' solution (other than separate systems).

One thing to watch: %RH... as the cooling load goes down... the ability to keep the air dried out... also goes down.
May need a de-hum down there.
 
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#4 ·
A typical midwest basement has a 1-2 ton of cooling capacity until the earth warms. I circulate fan "on" med 24/7 to warm the basement and use the free cooling. A good dehumidifier maintaining 50%RH in the basement helps warm the basement and keeps the home dry.
Been 90^F last few days and still no a/c needed.

Keep us posted.
Regards Teddy Bear
 
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