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While we're at it let's not forget unbalanced returns. It isn't uncommon to find 75% of the air going through one of the returns while the others barely move any air. Especially true when one return is a lot closer to the air handler.
Originally Posted by udarrell
I use angies list to look up providers (calling up the higher rated ones). I've called 4, 1 of whom refused to do a Manual J / D, two said they don't do it at all and one said they'd have a senior guy give me a call back. I'll be trying a couple more
I've currently got a 1" 18x20 filter installed (The return plenum is 21*22*20). From what i'm reading on here. It sounds like I should have a 4" filter of 20*25 size (2.5 tons = 1000 cfm and 1000/2 = 500 sq inch of filter). Should I ask them to replace the plenum and get a bigger one installed with the capacity for that sized filter.
The BR2 is getting too hot while BR3 is getting too cold.
I've measured temperatures of
MBR (location of thermostat) = 75, BR2=81, BR3=70
Keeping the doors of all rooms opens its much more even +/- 3 degrees
None of the guys so far have mentioned installing dampers on the returns or anything like that, what do you mean by unbalanced returns? and how would that be rectified? closer ones needing to be smaller not to pull all the required air?
One other thing, reading the forums here it seems that the Ductboard triangles are the worst thing to do and that is what I currently have. Three Flex take-offs going to triangles. One for the MBR, one for BR2 and one for BR3/4 and then flex ducts going to the registers from the triangles.
I read that the best thing to have is wye's. I would eventually like to upgrade that to a 3 zone system and therefore the triangles made sense from that perspective.
None of the techs commented on them being bad. One mentioned that they prefer using metal junction boxes instead but nobody recommended changing them out.
Would the square metal junction boxes be better then the triangles or have the same problems. Basically should I keep the triangles or spring for an upgrade
I find if very odd that BR2 and BR3 are 10 degrees apart even though they both are the same size rooms and have the same size and length of ductwork. Does BR3 face North or have lots of glass areas? Is BR3 hotter than other rooms in the summer? Does BR3 vents seem to have lower airflow coming out of the vents vs BR2? Is BR3 conductor pinched/blocked or obstructed in some way?
A lot of times new construction homes have worse air leakage and pressure imbalance issues than older homes. Check out this site www.comfortinstitute.org to learn more about a home energy audit/home comfort checkup
Originally Posted by mudgod