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Old 01-25-2013, 04:47 PM   #1
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Bottled water freezing in motorhome

I found it odd that a plastic bottle of water, placed on floor under the dinett seat storage area, was frozen.

The one placed on the kitchen counter, in the open, did not freeze.

I thought that the floor insulation was same thickness as the walls, about two inches.

Also there's only 2 to 4 degreee difference in temperature inside MH as compared to the outside temp. Wal-Mart thermometers don't seem to be as accurate

Don't know if a real high end MH would be better (Which I can't afford)

Any ideas?

Thanks in advance

Fred, US Army Aviation, 61-70
2002 Itasca Winnebago Ford V10
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Old 01-25-2013, 04:58 PM   #2
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Cold always goes down to the lowest point.
Bottom of the refrigerator is always colder then the top shelf.

Heat goes up.

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Old 01-25-2013, 05:10 PM   #3
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And without heated floors high end MHs are no different. Think about it, 2 inches of insulation in the walls and 4 in the ceilings and sub floors will allow more cold temps on the inside of the walls. And as stated by Triker56, that cold is going to settle on the floors.

There is a huge difference in the floor temps in our MH when comparing where the floors are heated and were they are not.

David & Gail Salisbury, NC
2003 American Eagle 42'
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Old 01-25-2013, 06:31 PM   #4
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We have a similar problem...don't feel like it's only your RV...it is just the nature of small spaces in RV's.

First - Visualize this, we have a loft bed up-high over the garage of our Class A toyhauler...This coach has heated basement bins and heavy closed cell foam insulation in all walls and ceiling.

While in very cold climates, the furnace will keep the coach as toasty as we like...but soon after the furnace blower shuts off, the natural impact of "hot air rises" makes the temperature near the floor drop and the tempurature in the loft climb.

We simply run a small fan to keep the air mixed - problem solved

Had the same happen in our last TravelTrailer...and it had Dutchmen's Arctic Package with special insulation and fully enclosed under carriage!
Kim and Steve, Mustang LCDR (USCG Ret), Outlaw #1193
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Old 01-25-2013, 06:51 PM   #5
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Your RV will gain a little bit of heat when sun shines in the windows. This is enough to keep the bottle on the counter, some ~30 inches off the floor, warmer than the bottle on the floor in a storage area, in a 'dead air' spot under the dinette. Insulation only slows the transfer of heat from warm to cold, it doesn't block it completely. Doesn't matter how much you paid for the unit, it's science.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 01-25-2013, 07:23 PM   #6
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If you have no heating inside the MH, then regardless of how much insulation you have, the temperature inside the rig will end up the same as the outside. Insulation just delays the inevitable and reduces the temperature variations because of the thermal mass of interior fittings and equipment and the time lag between changes in temperature on the outside and resulting change on the inside.
Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
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Old 01-27-2013, 02:29 PM   #7
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Thanks for the imput. I never did well in science. But I was very good
at girl watching.

Fred, US Army Aviation, 61-70
2002 Itasca Winnebago Ford V10
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