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Old 19-06-2021, 08:25   #1
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Leaving Air Conditioner running on when not at boat

I have always had a hang-up about leaving my air-conditioner on when leaving the boat in the summer. There is so much water flow that a small leak in a fitting or a thru hull could be disastrous.

I have noticed this year that most boats leave their AC on all the time and there is always water flowing in and out. I haven't heard of any boats sinking because of that, so I wonder if my concern is overblown. I do run a humidifier and it drains into the sink. I'm sure it gets hot in there, but I don't know of any issues caused by that.

I'm just curious what others do.
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Old 19-06-2021, 08:43   #2
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Re: Leaving Air Conditioner running on when not at boat

A good example of what is wrong in the world.

"the release of one gram of R134a would have the same global warming effect as releasing 1,410 grams of carbon dioxide"

Air conditioners have declimatized people so that they actually are dependent on them the same as illegal substances. If the power grid fails, these days people actually die as a result.

Air conditioning is bad for health and environment. There is no way to actually power all of them in a sustainable way, making use of A/C an entitlement issue. The worst part is you admit using it when you aren't even around making it a complete waste.

Very old boats last a long time without a/c. If you think it is somehow good for the boat, then there is something wrong with your boat.
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Old 19-06-2021, 08:49   #3
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Re: Leaving Air Conditioner running on when not at boat

To get to OP’s point, I agree that leaving AC on in unattended boat presents unnecessary risks. I also leave mine off. Have dehumidifier in the sink, but just drains to limited capacity internal pail. Pail fills in about a week. I’d rather have a hot humid boat than risk water ingress.
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Old 19-06-2021, 08:55   #4
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Re: Leaving Air Conditioner running on when not at boat

I typically leave mine on, but turned up to a higher temperature. That way it's not running flat out burning tons of power, but it keeps the humidity down in the boat and keeps it from getting excessively hot on really hot, sunny days if I'm not on board. If the weather is decent, I often turn it off upon arrival.

As far as flooding, mine have 3/4 inch intakes and outlets. Even if one fails, the bilge pumps will easily keep up until someone notices the problem. But I also don't typically leave the boat unattended for more than a few days at a time during the season.
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Old 19-06-2021, 09:04   #5
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Re: Leaving Air Conditioner running on when not at boat

Leaving a marine AC unit on while away from the boat is akin to leaving the dockside water connected to your pressure water system on while away from the boat, one small failure that could lead to disaster.
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Old 19-06-2021, 09:20   #6
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Re: Leaving Air Conditioner running on when not at boat

Quote:
Originally Posted by seandepagnier View Post
A good example of what is wrong in the world.

"the release of one gram of R134a would have the same global warming effect as releasing 1,410 grams of carbon dioxide"

Air conditioners have declimatized people so that they actually are dependent on them the same as illegal substances. If the power grid fails, these days people actually die as a result.

Air conditioning is bad for health and environment. There is no way to actually power all of them in a sustainable way, making use of A/C an entitlement issue. The worst part is you admit using it when you aren't even around making it a complete waste.

Very old boats last a long time without a/c. If you think it is somehow good for the boat, then there is something wrong with your boat.
Did you read the question?
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Old 19-06-2021, 09:28   #7
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Re: Leaving Air Conditioner running on when not at boat

I have to agree with smj.
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Old 19-06-2021, 09:31   #8
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Re: Leaving Air Conditioner running on when not at boat

Quote:
Originally Posted by seandepagnier View Post
The worst part is you admit using it when you aren't even around making it a complete waste.
You obviously didn't read my post. I don't leave mine running. Save the anger for someone else.
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Old 19-06-2021, 09:32   #9
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Re: Leaving Air Conditioner running on when not at boat

Quote:
Originally Posted by smj View Post
Leaving a marine AC unit on while away from the boat is akin to leaving the dockside water connected to your pressure water system on while away from the boat, one small failure that could lead to disaster.
My thoughts exactly.
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Old 19-06-2021, 09:35   #10
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Re: Leaving Air Conditioner running on when not at boat

Wow, such paranoia about water leakage. Doesn't anyone inspect and maintain their seacocks and hoses.

Back to the main question:

I lived aboard in Washington DC and Annapolis MD for three years while I was working, my last job, now 20 years ago. If you know DC summers you know how hot it gets. I ran AC and reverse cycle heat 24/7 summer and winter. With typical 90 degree plus summer days I doubt I could stood living in that environment for long.
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Old 19-06-2021, 10:07   #11
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Re: Leaving Air Conditioner running on when not at boat

We use a dehumidifier. Our out of town neighbor used to run the a/c unattended. They did have someone who checked on the boat weekly. It's a good thing because their bilge pump quit and they got minor sole damage.
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Old 19-06-2021, 10:20   #12
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Re: Leaving Air Conditioner running on when not at boat

Leaving a marine AC can be done in a marina if you have a strong bilge pump, and a run time alarm on it. Not really recommended though. The safer way to do it is a window shaker pointed through the front hatch. It will drip outside, and you can get really small ones that will get the job done with minimal power use. A good amount of solar/wind should be able to keep up with it easily.

In a perfect world of course you could just sail North until you don't need it any more.
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Old 19-06-2021, 10:22   #13
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Re: Leaving Air Conditioner running on when not at boat

My boat is berthed in hot & humid Houston.
When away from the boat I use an el cheapo domestic window AC, fitted into a frame that replaces my bottom washboard.
I run it on the "dehumidify" setting, and it works great to keep the mustiness & mold away
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Old 19-06-2021, 10:45   #14
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Re: Leaving Air Conditioner running on when not at boat

Quote:
Originally Posted by seandepagnier View Post
A good example of what is wrong in the world.

"the release of one gram of R134a would have the same global warming effect as releasing 1,410 grams of carbon dioxide"

Air conditioners have declimatized people so that they actually are dependent on them the same as illegal substances. If the power grid fails, these days people actually die as a result.

Air conditioning is bad for health and environment. There is no way to actually power all of them in a sustainable way, making use of A/C an entitlement issue. The worst part is you admit using it when you aren't even around making it a complete waste.

Very old boats last a long time without a/c. If you think it is somehow good for the boat, then there is something wrong with your boat.
Guess you donít live in Florida.
Ever try to get mold out of your boat after no A/C?
Yes we live in a world where we are addicted to many things.
I for one run my A/C 24/7 at my dock. Pristine interior no mold or foul smells.
Would you not run the A/C in your house? When your gone?
Turn up the temp still removes humidity.
Safe travels and stay well!
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Old 19-06-2021, 10:53   #15
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Re: Leaving Air Conditioner running on when not at boat

Quote:
Originally Posted by PamlicoTraveler View Post
You obviously didn't read my post. I don't leave mine running. Save the anger for someone else.
Sanctimonious thread hijackers salivating for opportunities to signal their virtue by lecturing others are the reason I almost never post here anymore.
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