a/c ducting whisper quiet a/c

Kathi-27

Well-known member
just had our rear a/c unit replaced. freezing up and not cooling very well over 90 degrees. had the tech double check ducting from a/c to duct. found it wasn't done very good at factory, alot of leaks. redid the transition and tape up all the leaks. has never had that much air flow before. can feel air 1-2 feet from vent. had trouble keeping rv below 80 degrees when was in the 90's before. now a/c cycles like it should and can get down to low 70's with no problem. there seems to be a problem with the factory not knowing how to work with ducting or doesn't care.
 

sdwelling

Active Member
It's a factory. Push it out, let the customer complain if it's not right. Hopefully they won't find "it."

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TravelTiger

Founding Texas-West Chapter Leaders-Retired
just had our rear a/c unit replaced. freezing up and not cooling very well over 90 degrees. had the tech double check ducting from a/c to duct. found it wasn't done very good at factory, alot of leaks. redid the transition and tape up all the leaks. has never had that much air flow before. can feel air 1-2 feet from vent. had trouble keeping rv below 80 degrees when was in the 90's before. now a/c cycles like it should and can get down to low 70's with no problem. there seems to be a problem with the factory not knowing how to work with ducting or doesn't care.

What model and floorplan do you have? How did they seal up leaks? (Did they do it with the unit removed?)


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Kathi-27

Well-known member
What model and floorplan do you have? How did they seal up leaks? (Did they do it with the unit removed?)


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2017 3875fb yes they found the duct problem when they had the unit off to replace it. the only way to get excess is with unit removed. found someone on the forum had this problem so had them inspect it when they had it off. suspected there was a problem cause didn't have good air flow out of vents in living area. was good in bedroom and bathroom. had to run front a/c at upper 60 degrees to keep living area at 78-80 degrees when over 90 degrees outside. rear a/c was just not keeping up. now just the rear a/c by it self will cool living area to 80 degrees without the help of the front unit. with both can get living area down to low 70's. can feel air up to 16-24 inches from vents now. could hardly feel air before unless front unit was also on. they used silver backed a/c tape.
 

bob.karen

Member
took our new 3870fb out on its maiden camping trip this weekend. it was in the 90,s all weekend. not only did the a/c's struggle to keep up, but they are extremely noisy. then they start a oscillating rumble. some vents have decent airflow coming out of them and some have none. anyone else have this issue? any advise?

thanks
bob and karen c.
 

Kathi-27

Well-known member
took our new 3870fb out on its maiden camping trip this weekend. it was in the 90,s all weekend. not only did the a/c's struggle to keep up, but they are extremely noisy. then they start a oscillating rumble. some vents have decent airflow coming out of them and some have none. anyone else have this issue? any advise?

thanks
bob and karen c.
rv a/c are a little noisy. you will get use to it and really won't notice it. scroll through the a/c section you will find several ideas on a/c. also look at heat and a/c operation guide in the tools section has good info. we have found that the bedroom gets about 4 degrees cooler than the living room. so we set the bed room 3-4 degrees cooler than the living room and have a tower fan at the top of steps blowing towards the living room. helps a lot. do not use ceiling fan when using a/c. found it hampers a/c operation. when it gets to in the 90's all rv's a/c have to work hard to keep unit real cool but they should at least be comfortable.
 

bob.karen

Member
rv a/c are a little noisy. you will get use to it and really won't notice it. scroll through the a/c section you will find several ideas on a/c. also look at heat and a/c operation guide in the tools section has good info. we have found that the bedroom gets about 4 degrees cooler than the living room. so we set the bed room 3-4 degrees cooler than the living room and have a tower fan at the top of steps blowing towards the living room. helps a lot. do not use ceiling fan when using a/c. found it hampers a/c operation. when it gets to in the 90's all rv's a/c have to work hard to keep unit real cool but they should at least be comfortable.

i did finally get better. but while laying in bed the bed vibrates when the a/c is on. and that rumble is terrible... i will check out the other posts for ideas. thank you very much
 

bob.karen

Member
rv a/c are a little noisy. you will get use to it and really won't notice it. scroll through the a/c section you will find several ideas on a/c. also look at heat and a/c operation guide in the tools section has good info. we have found that the bedroom gets about 4 degrees cooler than the living room. so we set the bed room 3-4 degrees cooler than the living room and have a tower fan at the top of steps blowing towards the living room. helps a lot. do not use ceiling fan when using a/c. found it hampers a/c operation. when it gets to in the 90's all rv's a/c have to work hard to keep unit real cool but they should at least be comfortable.

why do some vents have airflow and some dont?
 

danemayer

Well-known member
i thought the rectangle ones were return and the round ones supply. each unit has 2 rectangle ones with looks like a mesh filter
The rectangular ones are returns. The round ones are cold air into the living area. I noticed in June that new units on display at the Goshen Rally had rectangular returns.
 

esscobra

Well-known member
yes that's correct- over dec shutdown - they started the new roof truss/insulation design with the new duct design that way- 2 returns and the round ones are output- mine was one of the first to have it when factory restated production
 

clark261

Member
A ducted AC system distributes cool air throughout the RV using a network of ducts that run along the ceiling. In the ceiling of such a unit, there are numerous vents or ducts. These ducts are joined together using flexible foil furnace duct pipe or sheet metal ducting that looks like it belongs in a house.
 

2019_V22

Well-known member
A ducted AC system distributes cool air throughout the RV using a network of ducts that run along the ceiling. In the ceiling of such a unit, there are numerous vents or ducts. These ducts are joined together using flexible foil furnace duct pipe or sheet metal ducting that looks like it belongs in a house.
A nonsense reply to a 5 year old thread....
 
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