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RV-Dreams.com Home -> RV-Dreams Community Forum -> RV Maintenance and Technical Tips -> Effective AC Use
Post Info TOPIC: Effective AC Use
Ckerr


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Effective AC Use
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Sorry about the subject... Wasn't exactly sure how to condense my question to a few words... lol

We have a 40ft toyhauler with 2 AC units -- One ducted with a thermostat in the living area and one with controls on the unit in the bedroom.

They both cool great -- that's not the problem.  What we're finding now that we're transitioning to fulltime living is that the freezing breeze in the living area makes ti very uncomfortable whenever the AC runs!  We end up constantly bumping up the temp to stop the freezing breeze.  And then it eventually gets too warm and we need to turn it down.  My thought is that the thermostat should control this, but it doesn't seem to.

When we first purchased this 5er, we were told that the most effective way to use the ac was to always run the living area unit on HIGH COOL to avoid it freezing up.  We were also told to open the "dump vents" on the unit when we first set up to coool the interior quickly.   BTW, right now these "dump vents" are closed and I'm still feeling the breeze...

Any ideas/suggestions on how to make this set up work better are appreciated.  Also, anything we should check to uncover a problem if there is one...



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Carol

Carol Kerr Welch

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NorCal Dan


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You should be able to adjust the vents so they don't blow cold air directly at you. Does your unit have a remote thermostat? You may have a similar problem that we run into and that is the remote thermostat is on a wall that is getting direct sunlight. The wall warms up and the thermostat keeps calling for cool. Not sure what HIGH COOL means for your thermostat, but on ours we leave it on AUTO for the fan setting. If we don't use the auto setting the unit will run all the time. With it set to auto it will cycle on/off.

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Ckerr


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Thanks Dan.

We have a remote thermostat. It's on the wall just before the steps to the bedroom area. Maybe I'll pick up a small thermometer and put it in that area to check out the actual temp there.

We do run the fan on "auto." We have High and Low settings on Auto as well as High and Low settings on the continuous on setting. I just moved it to "LOW Auto" to see if that makes a difference.

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Carol

Carol Kerr Welch

Wife to Jeff, "Mom" to Chuy; Retama Village Resident

2018 Winnebago Horizon 40A,  Jeep Cherokee Limited, Harley Davidson Trike 

Realtor specializing in RV and 55+ Communities in the Rio Grande Valley

 

 
Bill and Linda


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Two suggestions:  First, if the thermostat is not “digital” change that out.  Not expensive and the ones from Hunter version from Wally World work just fine.  You can then move the temp in 1 degree increments and that can make a huge difference in comfort.  The older type, with the spring and slider control, are just very poor as they have to have a larger swing in temperature before they turn on or off the unit. 

 

Try  - http://www.klenger.net/RV_General/HVAC_Hunter_Tstat/index.html

for instructions and

 

Second, run the fan on low if you like.  It shouldn’t freeze up in normal operation.  If it does, then it is probably low on coolant.  That will make a large difference in the comfort level.  We run ours on low all the time after the rig is cooled down - especially in the evening.

 

Hope that helps.

 

Bill



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Ckerr


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Thanks Bill. It seems to be better with the fan on Auto Low right now. I've been wondering if we could change the thermostat to a digital one. This one seems pretty cheap. I actually think we had it replaced under warranty the first year. But that was 3 years ago and my memory isn't what it used to be...

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Carol

Carol Kerr Welch

Wife to Jeff, "Mom" to Chuy; Retama Village Resident

2018 Winnebago Horizon 40A,  Jeep Cherokee Limited, Harley Davidson Trike 

Realtor specializing in RV and 55+ Communities in the Rio Grande Valley

 

 
Texas TomT


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We have two 13,500 BTU Dometic AC's in our MH with the Dometic Duo-Therm digital thermostat mounted in the hallway, near no windows or outside doors. Each AC is individually controlled (by zone number) and we leave them in Auto most of the time. The way they explain it is, if the room temperature (at the thermostat) is 8° or more away from the set point, then the fan goes to HIGH automatically. If the temp. is withing 4°-8° of the set point, then it blows on MEDIUM. If the temp. is less than 4° from the set point then it blows in LOW fan. It will then switch itself to AUTO to maintain ±2° of the set point after it reaches that point.

Just an F.Y.I. and data is from Dometic for all their AC units.

 



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