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Old 07-10-2016, 08:18 PM   #1
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Using Mylar Thermal Emergency Blankets in Windows?

I've seen the idea of using the emergency Mylar Thermal Blankets in the windows to reduce the heat inside the RV. This seems like a great idea and one I'd like to try but could the big front glass of a Class A get hot enough to break if that is used on the inside of the windshield? We're anticipating a trip to NM, UT, ID and WY and know it's going to be HOT. We're hoping to use BML and NF campgrounds as much as possible so more than likely, won't have the AC on to cool the inside which would in turn cool the windshield at least a little. If we have to park so the front is toward the south/southwest, I'd like to have more between us and the sun than the shade, visor and windshield but don't want to chance damaging the front glass.

Any thoughts?

Karen & Gary
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with furkids Gypsy & Cody &
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Old 07-10-2016, 09:21 PM   #2
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good idea

Having used a lot of reflective sun shades in some very hot climates I've never experienced an issue. One exception that could cause a concern might be a stone chip star or existing crack which could spread.
We've had exceptional performance hot & cold from a product called "Prodex" cuts to size, rolls up when not in use.
I like the space blanket idea though very compact & cost effective indeed.
Happy motoring.
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Old 07-10-2016, 11:50 PM   #3
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The windshield should be OK. However, problems can develop by using the reflective material on the inside of double pane side windows in areas of intense sun.
George R. - Fulltiming since January '03
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Old 07-11-2016, 11:14 AM   #4
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The image shows a product called foil-foam-foil. Lowes sells it in several widths & lengths. Great product.
J.J. Hayden (KN4SH)
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Old 07-11-2016, 02:12 PM   #5
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X2. Some might say this an urban legend, but I'm not gonna take any chances. I use the bubble wrap only on my windshield, and it works great. However, don't use self-adhesive Velcro strips to hold it in place since the heat behind the windshield may melt the adhesive and cause a mess (ask me how I know...)

Originally Posted by gruelens View Post
The windshield should be OK. However, problems can develop by using the reflective material on the inside of double pane side windows in areas of intense sun.
George Schweikle Lexington, KY
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Old 07-11-2016, 03:04 PM   #6
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I use bubble rap for sun and cold. It makes a huge difference. I bought pull binds for the windshield and the front side windows for when I'm driving. They really help in the sun.
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Old 07-11-2016, 03:14 PM   #7
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You can have external covers made for the windows too. I have one for the windshield and it makes a huge difference with the amount of heat that comes through. Of course, The foil "bubble wrap" insulation is great too. We use it in our home here in the desert and it makes quite a difference.
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Old 07-12-2016, 12:22 PM   #8
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I bought two 42 X 48 sun shades for the windshield for $15.95 on E-bay.

Brand New 2 Panels RVs Class A Windshield Magic Sun Shade Sunshade | eBay
Dennis and Katherine
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Old 07-12-2016, 12:30 PM   #9
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I use Reflectix on my coach windows. Haven't bought yet but there are some good front cab window shades on eBay.
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Old 07-12-2016, 12:38 PM   #10
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I have used the Mylar emergency blankets but on the outside of the window. It makes the glass cool as the inside of the coach.
When I used it it was at a rv rally in Goshen, In. in 100 degree temps. When I installed it the glass was too hot to touch. I had to use gloves. In 20 minutes the glass was under 80 degrees and continued to cool to the same temp as inside.
If it was applied inside I don't think it would have cooled down the glass.
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Old 07-12-2016, 01:57 PM   #11
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Agreed, it's best to put something on the OUTSIDE of your big motorhome window. We used a window screen from Prompt - easy to put up and very reasonable in cost. They have them for every make RV. You can notice the difference immediately. If you get one, get a darker color - black or dark brown. You'll be able to see out of it much better than a light-colored one.
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Old 07-12-2016, 02:11 PM   #12
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I have used Reflectix in the front windows while the rig is in storage.

Also use Reflectix in the bedroom windows and the shower skylight.

Air temps have reached 108 degrees and the blacktop was 140 degrees in the storage lot.

The adhesive on the velcro strips did melt, but no damage to the windshields.
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Old 08-17-2016, 07:03 PM   #13
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Old 08-17-2016, 09:12 PM   #14
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I used some fabric with a twist. I sewed in a reflective insulation from Lowes for the front windshield for extra heat resistance. I went on to make ones for the rest of the coach but without the reflective insulation so we had natural light inside. It worked extremely well as we camped the last week in 95+ degree heat with no problems keeping the coach cool. So cool my children and wife kept putting blankets on when we were inside.

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