AC keeping back and front rooms cold?

[ShawnCBerg]

http://www.lazydays.com/RvShop/Product/1022844

Looked at this travel trailer tonight and really liked it. AC seemed like it had been on and set to a low temp (55 degrees) all day. It was nice and cold in the main part of the RV but the back room and master bedroom were considerably warmer. Each of those rooms only had one small vent that barely blew any air out. Is this normal? I like it nice and cold when I'm sleeping and I'm curious if this is a normal issue with TTs or if this TT may have an underpowered AC unit? Doors/curtains were open for both rooms, by the way.

[Mike_Up]

ShawnCBerg wrote:
http://www.lazydays.com/RvShop/Product/1022844

Looked at this travel trailer tonight and really liked it. AC seemed like it had been on and set to a low temp (55 degrees) all day. It was nice and cold in the main part of the RV but the back room and master bedroom were considerably warmer. Each of those rooms only had one small vent that barely blew any air out. Is this normal? I like it nice and cold when I'm sleeping and I'm curious if this is a normal issue with TTs or if this TT may have an underpowered AC unit? Doors/curtains were open for both rooms, by the way.

Sounds like something is broke, maybe the vent leaking cold air into the ceiling.

My trailer keeps every area nice in cold. I have many vents. The bedroom areas are always nice and cold even when it's in the high 90s in direct sun. Never have to set the thermostat lower than 70 degrees.

Maybe that's one you should pass on.

**EDIT** They may have had the AC shroud vents (Chiller) open. That's not suppose to be open unless you want to cool the main living area quickly, then you close those vents. It takes the air away from the other ceiling vents.

See Here This is what I have in my Jayco.

Coleman wrote:
Designed for use with Coleman-Mach rooftop air conditioners with ducted distribution systems. Exclusive DirectFlow Louver System provides cool air where you need it for personalized comfort in any RV. Open the specially designed Louvers to channel cool air straight down into the cabin. Close the louvers to divert cool air through your existing duct system. Exclusive EZReach Filter System provides quick access to the washable air filter. Slender profile provides plenty of overhead clearance. Wall thermostat sold separately.

[Bob_Shaw]

I had that problem with my previous 5th wheel, so, for this one I had them install a second a/c in the bedroom. Guess what the rear a/c cools the bedroom just fine in this larger 5'er, with the same size a/c unit. I read on hear that some of the ducted a/c units are not sealed well between the unit and the ducting, and you lose a lot of cool air into the ceiling. So, first I'd check that the dump vent is fully closed, then check to see if you're losing air around the ducting, both ends, and possibly check for some obstruction in the duct. JMHO

[rbpru]

Balancing air and heating in difficult, I use a fan to push air where I would like it.

It it no different than trying to get uniform heat in your house.

[spoon059]

Vented air conditioners have dump vents on the AC themselves. When those dump vents are open, the majority of the air dumps straight into the main room and minimal air goes through the vents to the end rooms. I would guess that the dump vents were open, cooling the main room. If you close those dump vents, it will push the cooler air through the vents and cool down the ends of the trailer.

That being said, your vents run through the roof. They displace insulation and can get hotter because of the sun beating down on the roof. Air coming out of the vents, especially at the furthest ends from the AC unit will be warmer than straight from the dump vents.

You are down in Florida... make sure you have the upgraded AC unit if you can. My Jayco came standard with a 13.5K AC unit, but I paid a minimal upgrade to get a 15K AC unit. Depending upon how and where you camp, it might be a good idea to consider a second AC unit and 50 amp service. Heat and humidity can overwhelm a single AC unit.

[Jframpey]

I have only 1 A/C unit in a 31' TT. It cools fine - 2 outlets in the bedroom. The A/C does have vents on the unit that can be opened to direct all of the air out of the unit... It's called an artic blast feature or something like that... It's designed to cool the main area faster after initial hookup. Make sure that's not open - it will send no air to the bedroom while cooling the main area.

[TJHUB]

Hunterred wrote:
Try closing the vents in the living area, if you can keep the ends cool the middle won't have a choice but to follow

This works perfect for me.

[deltabravo]

Hunterred wrote:
Try closing the vents in the living area, if you can keep the ends cool the middle won't have a choice but to follow

Ditto.

[Hunterred]

Try closing the vents in the living area, if you can keep the ends cool the middle won't have a choice but to follow

[Golden_HVAC]

It does seem like you need more vents in each section of the RV. You mention that they have a very cold living area, where the A/C is located, but to warm in the other areas with only 1 vent, for say 8 or 10' of the RV length. This shows how poorly the designers thought about the air distribution.

They could have put another vent in each room, and then it would have been equally cool from front to back. . .

It reminds me of a motorhome that I looked at once. It had a passenger side shower, mid couch. Under the shower was a grey line, going under the driveshaft, to the drivers side grey tank. I thought this was a horrible design. Not only low, and might get damaged by some road debris, like a tire tread or something, but also what if you stop quickly, and all that grey water flows forward in the tank, into that 4" line going up to the shower! You would have a personal version of a geyser!

I have never seen anything like it on any other coach that I have looked at! I can only wonder why the production staff kept building RV's with such a design, and the company never fired the designer for coming up with such a plan for the grey water.

Good luck on your RV search. It seems like that brand of RV is not designed properly, and the 'fix' might be that you will have to buy a second A/C unit.

I have a 30' Bounder with single A/C. I have two vents in the rear bedroom, one in the kitchen, and three towards the drivers compartment. It seems to keep about equal temperature all over the coach.

Good luck,

Fred.

[Terryallan]

Did you notice what speed the fan was on. If on low, that could be the reason for low flow. also IF the vents in the bedroom were not sealed where they connect to the hose. It could be losing air into the overhead. I do know my single AC will pretty well freeze me during the night. Much depends on the R value of the TT

[midnightsadie]

most tt should have two ac units but that runs the cost up, you could put a fan up front to blow air back. but two is all ways better than one.