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  1. #1
    Setting Up Camp
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    OK to leave A/C ON when Away from Trailer?

    What is the general wisdom here? An RV tech who serviced my 295RL in Fort Myers Florida said that he has seen many trailers that had a fire due to leaving the A/C on when away from the trailer. Because of his advice I have been leaving mine off when we are sightseeing for the day. Coming back today the trailer was 95° inside… in Michigan. I have a friend who bought a brand new Grand Design Fifth Wheel and has it stored for the summer with the A/C set to 80. Is he looking for trouble?

  2. #2
    Rolling Along
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    The AC is no more or less likely to cause a fire that the one in a sticks & brick. Do you turn your AC off when you leave home?
    2010 Jayco 26(SOLD)
    2011 Keystone Outback 277RL(SOLD)
    2021 Grand Design 268BH
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  3. #3
    Site Team Member traveldawg's Avatar
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    We always leave ours on. Threat of fire from and AC would never have entered my mind.

    We always make sure certain things are unplugged and the water is shut off at the outside when we leave for the day tho.
    Larry KE4DMG
    2022 F-350 KRU SRW LB - Airlift 5000+, ForScan, 37 RDS Aux Tank,
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  4. #4
    Site Sponsor NB Canada's Avatar
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    Why would it start a fire any more when you are gone than when you are there?


    2021 Imagine 2400 BH
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    2021 Imagine 2400 BH
    2018 GMC Sierra 4x4 Crew 1840lb payload

  5. #5
    Rolling Along
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    Never heard of a fire caused by a overused A/C. Only thing I can think of that could cause a fire was ould be electrical or the fan motor which seems unlikely as it would probably die out before getting to start a fire. Not saying it isn't possible or hasn't happened, just never heard of it. My guess is if A/C units were left running, so were dual fuel refrigerators. Fires caused by that are heard of.

    Newly full timing in our 2021 Momentum 395MS-R with our tow pig being a 2021 F-450 KR

  6. #6
    Site Team Redapple63's Avatar
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    You be fine leaving it on.
    2019 GMC 3500 SRW Sierra Denali Duramax
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  7. #7
    Seasoned Camper
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    Based on our full time experiences, about 1 in 5 mobile RV service techs actually know what they are talking about, I don't think the one you spoke with knows what he's talking about candidly. Since our second month full-time I never call them, we just fix stuff ourselves...it's part of the journey. And on AC, our dog would die if we didn't leave the AC on, we just monitor temp remotely while we're out for the day. Best wishes.
    Jeff & Ally
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  8. #8
    Site Team Member traveldawg's Avatar
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    Quote Originally Posted by NB Canada View Post
    Why would it start a fire any more when you are gone than when you are there?


    2021 Imagine 2400 BH
    2018 GMC Sierra 4x4 crew
    Maybe because motors and electronics and even the compressor is generating heat? Maybe because some active electrical component goes bad under power? Maybe the OP ins't familiar with electronics and is asking a good question and wants some good feedback?

    I would have thought you would have known that.

    IMO electronics and electrical items normally fail under power more often than when just idle. Not that idle electronics/mechanics don't do it tho.
    Larry KE4DMG
    2022 F-350 KRU SRW LB - Airlift 5000+, ForScan, 37 RDS Aux Tank,
    2019 310GK-R - Sailuns; MorRyde IS; Disc Brakes; 20K Reese Goosebox
    Search kalakamods for my mods


  9. #9
    Site Sponsor NB Canada's Avatar
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    Quote Originally Posted by traveldawg View Post
    Maybe because motors and electronics and even the compressor is generating heat? Maybe because some active electrical component goes bad under power? Maybe the OP ins't familiar with electronics and is asking a good question and wants some good feedback?

    I would have thought you would have known that.

    IMO electronics and electrical items normally fail under power more often than when just idle. Not that idle electronics/mechanics don't do it tho.
    Huh?
    My point was if it was thought it could cause a fire when you are gone why would you use it when you are there


    2021 Imagine 2400 BH
    2018 GMC Sierra 4x4 crew
    2021 Imagine 2400 BH
    2018 GMC Sierra 4x4 Crew 1840lb payload

  10. #10
    Rolling Along
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    It is possible but occurrences are rare. I have a customer that left his boat AC running 24/7. The fan motor froze up and lost all of it's smoke. If he had been a few minutes later showing up it would probably gone up in smoke. That said, that's the only time in 20 years that I have seen it happen.
    2010 Jayco 26(SOLD)
    2011 Keystone Outback 277RL(SOLD)
    2021 Grand Design 268BH
    2013 Ford F250 XLT, 6.2L Gas

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