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Old 06-28-2020, 06:06 PM   #1
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Leave AC on when not there?

I was just wondering what most people set their Air Conditioning system to when away from the boat for a week or so??

It was recommended to set at 85F and another guy said to put in humidity mode.

The boat is on Hilton Head and it gets hot every day till about Oct...

Thanks for suggestions and comments.

Jeff
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Old 06-28-2020, 06:41 PM   #2
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I set my A/C in my Florida condo to 80 deg F when we are not there in the summer.

I don't know what humidity the "humidity mode" controls to on marine A/Cs and I kind of doubt it has a humidity sensor that it controls to.

So setting it to about 80 should work fine.

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Old 06-28-2020, 07:04 PM   #3
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I leave one of mine on set to somewhere around 76-78 when away from the boat in hot, humid weather.
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Old 06-28-2020, 07:05 PM   #4
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I use Moisture mode. Here is the description from Marine Airrr Elite control panel.

Moisture Mode
While in the On Mode, press the Mode Button until the Moisture Mode LED is illuminated. Every four hours, the fan is started and air circulated for thirty minutes. During this time the air temperature is sampled and entered into memory. The cooling cycle is started and continues until the temperature is lowered 2°F (1.1°C). The compressor is allowed a maximum of one hour running time to reach the desired temperature. Four hours after the tempera- ture is satisfied, or the compressor times out, the cycle will be repeated.

The boat may get to 90 degrees, but it is always dry.
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Old 06-28-2020, 09:11 PM   #5
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I set a Peltier effect dehumidifier to run all the time draining into the galley sink. No marine a/c left on because I worry about some casualty to the water supply like the plastic end of a march pump or a loose hose fitting ot God knows what sinking the boat. I once had a hatch top air-to-air unit I did not mind leaving on, and the current boat has a rooftop unit in its hardtop which I could use, but the return for the electric bill would not be worth it since the little dehumidifier does s good job.
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Old 06-28-2020, 10:03 PM   #6
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I left mine in humidity/moisture mode when I left it from mid March to early May unattended in Ft Myers FL. I was very concerned about the strainers because they would clog pretty quickly under normal usage in those warm protected waters. Temps were 80s and 90s.

The boat had no mold or moisture when I returned, and strainers had moderate accumulation. That might help you gauge.
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Old 06-29-2020, 05:57 AM   #7
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I leave the AC set to 85 deg in the summer but.....

If I leave for a week or two, I set it to dehumdify mode so the strainers don't get clogged. Water temp down here in Ft. Myers is 90 deg so stuff grows in the water easily. If I'm around the boat......

I clean the strainers every 3-5 days and fill them up with Bromide pool tablets. I've been doing that for years and it keeps growth out of the lines.

If I don't set the AC to 85 deg., the interior temperature of the boat will go to 125-135 deg in the afternoon and I think that's too hot.
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Old 06-29-2020, 07:10 AM   #8
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During the summer, I leave one unit set at 80 to keep the boat dry and the temperature from getting excessive. The rest of the time I have a 2,000 square foot capable dehumidifier with a humidistat set at 50% relative humidity, that sits on the galley counter and drains into the sink. Both do a great job of keeping the boat humidity low to avoid mold and other types of growth.

Ted
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Old 06-29-2020, 08:39 AM   #9
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If we didn't leave ours on, we would have a mildew explosion with our high humidity down here. Luckily, our marina charges a flat fee for electricity, so it doesn't matter.

We run a dehumidifier, too, that was built into the boat from the factory.
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Old 06-29-2020, 09:18 AM   #10
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OK, a dehumidifier sounds like a good plan, can I get a few recommendations of what type or size?
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Old 06-29-2020, 09:37 AM   #11
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https://www.homedepot.com/p/GE-20-Pi...20LY/310574305 Used this one in S FL on my old 43 Mainship. Set to 50% and drain to overboard sink with hose
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Old 06-29-2020, 10:26 AM   #12
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I put a household dehumidifier in the salon of my boat. Unit cost about 200bucks. Has a hose connected so it piddles into the aircon sump. Uses about 3.5A when running. Boat gets hot as heck in the daytime, but heat decreases RH so unit does not run during the day. Comes on at night. Boat stays nice and dry. I leave the AC units off. Power bill on my shop/dock meter went up about 10bucks a month. When I left the AC's on to control humidity, power bill was up about 50-100bucks a month. And they would come on mostly mid day what humidity was not an issue fighting the solar heat. The dehum is the cat's meow.
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Old 07-01-2020, 11:53 PM   #13
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Use humidity mode. That’s what it’s for.
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Old 07-01-2020, 11:58 PM   #14
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I leave mine on. I would rather pay a little extra in electricity than bake the inside of my boat. And as far as wearing out the equipment, if it is going to fail, I would rather have it fail at the dock than away from it.
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Old 07-02-2020, 08:37 AM   #15
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i use 30 quart dehumidifier. just be sure your wife doesn't put the drain stopper in. yes that was a disaster . i think i'm going to connect my forward ac unit to my monitoring system so i can turn it on before i start my 3 to 4 hour drive to the boat. should make the first entry much better .
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Old 07-02-2020, 10:01 AM   #16
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It is sometimes inconvenient to place a portable dehumidifier in a location where it will self drain. For a few more bucks you can find one with a built in pump that will pump the condensate uphill into a sink or overboard.

I solved the problem by building a whole house dehumidifier into the AC ductwork. It can be run on batteries an anchor.
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Old 07-02-2020, 12:09 PM   #17
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Couldn't you just drain the dehumidifier into the bilge and let the bilge pumps take care of it ?
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Old 07-02-2020, 12:30 PM   #18
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30-35 pint dehumidifier drained directly into the sink is great, no pumps to worry about. I am at the boat frequently enough to empty the tank on the unit but if away for any length, hook it up to a hose make sure to weigh the other side so it doesn't pop out of the sink and let it do it's thing. If temp is the concern then run the AC unit. Have a boat neighbor stop by and check on it for you say every week or every other week.
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Old Yesterday, 01:38 PM   #19
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I did not want to run any of my 3 dometic turbo DTU air conditioners while the boat sat for a long time in the Florida heat/humidity. I bought a relatively inexpensive ($350 USD I think) Haier two hose portable air conditioner.... It has no water accumulating ability.. the water vents outside with the hot air that blows from the Haier. No need to run a cooling water pump like my dometics use... so all thru hulls can be closed....
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Old Yesterday, 02:54 PM   #20
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Quote:
Originally Posted by jefndeb View Post
I was just wondering what most people set their Air Conditioning system to when away from the boat for a week or so??
Jeff
Like others have indicated, we use a dehumidifier from Home Depot draining into one of the sinks. Why run a $2K marine AC when you can run a $300 dehumidifier that also cools the air a bit? A couple of fans on a timer help circulate the conditioned air around the boat and it's three cabins.

Sanderling's asking price has been reduced to $75K!
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