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Old 06-07-2013, 09:37 AM   #16
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Stagnant Air Flow in Master Bedroom


as to the question of if a new condenser and an old air handler is a good, well, it depends on the size match and oriface type. Fixed cap tubes were good for many years, but a TVX does a better job of metering the refigerant. check to see what type you have. Additionally, old coils do have a tendancy to clog up with dust, dirt and corrosion.

if it were mine, I would check the size, get it clean, clean, clean and then clean the blower wheel too!!

as to humidity/stuffy, keep an eye on your run times and make sure your system is making condensation, if not, you have some issues (unless you are in phx, where it will be 112 today with about 10 percent humidity, thus not a lot of condensation water will be produced here today!!!)

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Old 06-07-2013, 09:52 AM   #17
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Stagnant Air Flow in Master Bedroom


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Originally Posted by old_squid View Post
Stagnant air flow and uncomfortable feeling are both perceptional explanations that need to be better defined to come to some kind of conclusion as to what may be the issue(s).

Questions I would be asking would be:
What temperature and humidity level does the system maintain?
Does the rest of the house feel "good" to you? IE: Have you tried sleeping for one night in another bedroom and seeing if that room is perfect or has the same "feeling"?
Describe what your experiencing when it feels stuffy or that the air is stagnant.

"Usually" stuffiness and stagnant air feelings are the way your body reacts to higher humidity levels than what you feel comfortable with. These feelings are exaggerated when in bed and covered up.

From more than a thousand miles away I'd suspect that the system is not controlling the indoor humidity to a low enough level. I say this because the usual reaction to too high of humidity is to try and increase air flow to make your body sense that it's more comfortable.

Just a few thoughts with limited information.
Yes, we slept in a much smaller guest room the other night. The ceiling fan is directly over the bed, and you could feel the air move.

All I can say is that in the master bedroom, once the HVAC cuts off (it has "reached its optimal temperature"), it gets hot. It feels like air is not moving at all, even with our one large ceiling fan running. The goal is to feel air moving, even when the HVAC is off.
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Old 06-07-2013, 09:54 AM   #18
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Stagnant Air Flow in Master Bedroom


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Originally Posted by bobinphx View Post
as to the question of if a new condenser and an old air handler is a good, well, it depends on the size match and oriface type. Fixed cap tubes were good for many years, but a TVX does a better job of metering the refigerant. check to see what type you have. Additionally, old coils do have a tendancy to clog up with dust, dirt and corrosion.

if it were mine, I would check the size, get it clean, clean, clean and then clean the blower wheel too!!

as to humidity/stuffy, keep an eye on your run times and make sure your system is making condensation, if not, you have some issues (unless you are in phx, where it will be 112 today with about 10 percent humidity, thus not a lot of condensation water will be produced here today!!!)
I have a small digital humidity reader in my room, and it reports around 51 - 56% humidity.
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Old 06-07-2013, 12:40 PM   #19
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Stagnant Air Flow in Master Bedroom


This really sounds like poor or no return air being taken from the room.

Two tests. Sleep one night with the door propped open about 6" or so. Is that better? Then you may need to add a return duct.

Second test is run the fan for your system and then begin to close the door and stop around 3" away from completely shut and see if the door closes the rest of the way on its own. Now, if the door kind of slams shut and doesn't slam shut without the fan running, then it is likely return air that you need.

Spend the night in one of the other rooms or all of the other rooms with the door shut. Are they stagnant as well? If they are repeat the process with the door propped open 6". If not, then take a look at the doors, is there a big gap under the doors for your other rooms? If there is then take a look at the master bedroom door. Is there a gap there or is it tight to the carpet?

I don't think that cutting the doors down is ever the answer for solving problems like this but it is certainly the cheapest but at the sacrifice of some privacy. It sounds like you can get into that attic pretty well, so adding return air vents would not be too difficult.

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