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Old 09-16-2020, 03:47 AM   #1
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A question on managing humidity with air-conditioning

I was wondering about people‘s experiences with running their air conditioners during the summer months in humid climates while stationary (as opposed to when in motion). Were you able to control humidity effectively without over-cooling your bus? And what kind of air conditioning you were using, rooftop units, mini splits, etc. A lot of controlling humidity has to do with the air-tightness of the space.. My initial thought is that without a lot of work done on the windows and doors, that is not often very good. I would like to hear what your experience has been.
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Old 09-16-2020, 04:10 AM   #2
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Most rooftop units and mini-splits are thermostatically controlled to prevent over-cooling. However, the fans generally run non-stop when the unit is on whether the compressor is running or not.
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Old 09-16-2020, 12:16 PM   #3
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Quote:
Originally Posted by CHEESE_WAGON View Post
Most rooftop units and mini-splits are thermostatically controlled to prevent over-cooling. However, the fans generally run non-stop when the unit is on whether the compressor is running or not.
I'm thinking this might be an issue that has not gotten that much attention. I'm thinking about HVAC issues from the perspective of someone who would be living in their bus. As I gain more and more experience with my current bus more and more questions come up. I really don't like humid spaces and I am mold sensitive so I am interested in keeping any space that I will be living in below 60% humidity. But just as I learned that the winter weather moves easily through my windows and so does the humidity in the warmer weather. I am slowly tightening up my bus. I removed five of my large 54 x 28" windows a few weeks ago and replaced them with some nice 18 gauge sheet-metal. I will be working to get the remaining windows to be less leaky. Sealing the doors, especially the main door is high on my agenda as well. I also have to think about making the right choices with regard to the HVAC equipment. I am retaining the factory air-conditioning and I'm planning to supplement it with what will probably be a pair of mini split units. It seems like the biggest question with any HVAC system is the question of sizing it correctly for to the climate and the structure. It seems that this is crucial because if you oversize your system and it cools your structure too quickly then it won't be able to do a good job of dehumidifying. Instead, if I understand this correctly, you want your AC to run almost continuously and to do so without over-cooling your space. When you have achieved this happy state you will also have achieved the conditions necessary for optimum dehumidifying. Good HVAC contractors do a lot more than just sell and install equipment, they really have to have some pretty good knowledge about the science and technology of what they're doing. I'm thinking it couldn't hurt to try to apply some of that knowledge to what we are doing with buses. I'm hoping others have also thought about this and can enlighten me.

Or, as I keep saying, maybe I just need to move to a place where the weather is more moderate than it is here in Southeastern Wisconsin.
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Old 09-16-2020, 03:14 PM   #4
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minisplits are the best option for humidity control , they will lower their fan speeds before lowering the compressor speed.. the result is ice cold air whiuch removes humidity well.. you can also run your minisplit forced into low fan speed which helps.. it will run the fan all the time which can cause humidity isues on cool but damp days.. where you dont need much cooling at all but its raining outside..
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Old 09-16-2020, 08:38 PM   #5
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[QUOTE=cadillackid;406000]minisplits are the best option for humidity control , they will lower their fan speeds before lowering the compressor speed.. the result is ice cold air whiuch removes humidity well.. you can also run your minisplit forced into low fan speed which helps.. it will run the fan all the time which can cause humidity isues on cool but damp days.. where you dont need much cooling at all but its raining outside..[/QUOTE

Thanks for that info. They occasionally have some good HVAC discussion over at greenbuildingadvisor.com They are followers of the Building Science Corp. and are evangelists for building houses in the best way possible using the latest tools and techniques. It is pretty interesting.

With regard to sizing my HVAC system. I think it will be fairly unlikely that I over size it, in part because of space and electrical limitations. Yeah because I’m having to be very frugal with my budget.
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