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re: A/C Ducting Design - Jumper Ducts for Hot Bedrooms with a Hallway Return
Posted on 5/24/19 at 6:16 pm to deeprig9
Posted on 5/24/19 at 6:16 pm to deeprig9
It is the same regardless of a separate air handler. Positive pressure whether from choked supply or lack of returns give the same results. If you don't have less restrictive path somewhere your blower will produce less cfms and deliver less cooling unless you have an ECM blower.
This post was edited on 5/24/19 at 6:16 pm
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Posted on 5/25/19 at 7:06 am to notsince98
quote:
You have to think of supply and return. Anywhere there isn't enough return, the static pressure for that supply is higher than elsewhere so the flow goes elsewhere down the easiest path.
Ok, this makes some sense.
I still don’t think it’s the OP’s issue though. I’ve never seen this personally with returns in bedrooms. I still stand by the fact more often then not there are bedrooms that get frigid cold because they are small and have one vent or larger with 2 or 3 that’s still greater then the average on the handler, thereby putting more cold air in that room.
Having a gap under the door would solve this same thing. It wouldn’t take a large gap at all, 1/2 inch gap on a 30 inch door would be very similar to a 4 or 6 inch return.
I’d look into adding larger duct to the bedroom vents first personally. If they are 6” make them 8” that type of thing.
I don’t see how one 6” return is going to eliminate a pressure situation preventing the needed airflow. You are talking about the pressure into the entire room pushing back into a 6” return. That’s a very small hole in a large container, I just don’t see it making a huge difference. I think the situation is likely more that he is not getting enough pressure from the handler in the first place by it being too far from the handler, not big enough venting, etc.
This post was edited on 5/25/19 at 7:09 am
Posted on 5/25/19 at 2:57 pm to baldona
You still aren't getting it.
It is warm air I want to expel from the bedrooms so a bottom gap or or whatever is going to expel the cooler air. A gap at the top of the door would make sense but is unsightly.
I need to do a proof of concept.
It is warm air I want to expel from the bedrooms so a bottom gap or or whatever is going to expel the cooler air. A gap at the top of the door would make sense but is unsightly.
I need to do a proof of concept.
Posted on 5/25/19 at 3:09 pm to deeprig9
Have you tried adjusting the damper going to the rooms from the plenum? Could be something simple.
Before I cut holes and/or re-engineered a system, I’d get someone to come out at look at what you have, take some airflow and temperature readings, maybe service the system and then give you a recommendation.
I’m trying to visualize what you’re describing, without pictures, and I might be right, but I could also be way off.
Before I cut holes and/or re-engineered a system, I’d get someone to come out at look at what you have, take some airflow and temperature readings, maybe service the system and then give you a recommendation.
I’m trying to visualize what you’re describing, without pictures, and I might be right, but I could also be way off.
Posted on 5/25/19 at 3:30 pm to Citica8
This time of year ain't nobody got time for that. "Hi, I know it's the middle of a heat wave but Im wondering if you have a guy who can come out and talk to me about ducts and whatnot "
Ill try to put together some visual reference later but I feel I have explained it pretty well.
Ill try to put together some visual reference later but I feel I have explained it pretty well.
Posted on 5/25/19 at 7:21 pm to deeprig9
A HVAC company that’s big enough should have someone available to come out and take a few readings for airflow and temperature, if they don’t, call another one. Some will have infrared cameras, it could be an insulation issue.
You might think it’s explained well, but it’s got little pieces of information scattered through 2 pages of this thread, a lot of which is important to figuring out the problem. Especially since we can’t see it.
In the OP it read as if it was one unit, later it reads like there is an upstairs unit and a down stairs unit. If this is the case you shouldn’t be losing all of your cold air to the bottom floor even if doors are open. Unless it was a really poor design, which it could be.
There is a reason why houses use a centrally located return for a unit now, if your house was designed for this it shouldn’t be that inefficient if everything is functioning properly, which is why I would have a professional come out before you start cutting into the ceiling and duct work.
Another thing you can do, since you keep mentioning heat rising and cold air falling is the use of fans to circulate the air to limit the layering affect.
You might think it’s explained well, but it’s got little pieces of information scattered through 2 pages of this thread, a lot of which is important to figuring out the problem. Especially since we can’t see it.
In the OP it read as if it was one unit, later it reads like there is an upstairs unit and a down stairs unit. If this is the case you shouldn’t be losing all of your cold air to the bottom floor even if doors are open. Unless it was a really poor design, which it could be.
There is a reason why houses use a centrally located return for a unit now, if your house was designed for this it shouldn’t be that inefficient if everything is functioning properly, which is why I would have a professional come out before you start cutting into the ceiling and duct work.
Another thing you can do, since you keep mentioning heat rising and cold air falling is the use of fans to circulate the air to limit the layering affect.
Posted on 5/26/19 at 6:40 am to deeprig9
quote:
It is warm air I want to expel from the bedrooms so a bottom gap or or whatever is going to expel the cooler air. A gap at the top of the door would make sense but is unsightly.
A 1/4” or 1/2” gap on the bottom of the door is normal and not noticeable. Do you have a door sweep or something preventing any airflow out of your bedroom doors?
Your return pulling warmer air from the bedrooms makes some sense. In the winter you will do the same though remember.
All I’m saying is normally bedrooms stay cooler as they don’t have exterior doors and what not to lose their cold air. I still think your issue is they are not receiving enough air from the handler. I’m not saying your idea is bad, I just don’t think it’s the best cure.
Posted on 5/26/19 at 2:58 pm to baldona
quote:
I still think your issue is they are not receiving enough air from the handler.
Agree. Which is why I recommended having someone come out and look at the system. Could be losing air between the returns and the vents, or the coil could need to be cleaned.
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