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Heat reduction through windows.
#11
Roaming Kat had a clear UV / IR tint added to her front windshield, but I've not seen her post here in a while.
She said it made a significant difference in heat, and I believe it. I wonder if looking at it or though it with polarized sunglasses caused the 'rainbow effect'

i see lots of high end cars with heated windshields, if I look at them with polarized sunglasses they look pinkish but without glasses they are clear.


I ordered the larger roll of the 'Jahoot ' static cling mirror tint and peeled off the too short piece on my rear conversion van window on drivers side and redid it.

One interesting result is that I added a second small layer in the middle, right where my center blackout panel resides, and then busted out the IR gun.

The bed plywood receiving direct sunlight though one layer of the Jahoot was 91.5 F, the part receiving direct sunlight through two layers of jahoot was 89.5f.
But if I placed IR gun directly upto the jahoot, the area with 2 layers was 2 degrees hotter than the adjacent area with one layer. I put some masking tape on each as the IR gun does not work properly on reflective surfaces, and the result was the same, the glass with two layers of 'Jahoot' was hotter than that with just one.

The 'too short' piece I removed, I added to a door pop out window and there is now 3 layers of tint there, one limo tint and two of 'jahoot' atop it. It is basically impossible to see into the van through it in daytime, even across the van to the other not black out panelled window.

But two layers of 'Jahoot' might radiate more heat from the window itself to the interior than just one. I am not understanding the physics of that, yet, but it is hard to argue with actual measurements.

I also 'jahooted' my center smoked glass conversion van window and have a good portion of the roll left over.

I might do an ~ 6 inch strip at the top of my windshield. I have some extremely degraded now purple and cloudy Limo tint up there from 2001 or so, poorly done, in three pieces. Not sure the legalities of narrow mirror like tint strips on the top of the window, but if I get pulled over I can rip it down in two seconds and make the cop think they are hallucinating.

Amazon has been sending me links to similar products as the 'jahoot'. These products are the same dimensions, but 2x the price. perhaps they have better clarity, Perhaps they are the same dang product with a different name and price tag.

https://www.amazon.com/gp/product/B07P9J..._426928630

I wont be the one to figure this question out though.

I am extremely happy with the heat reduction on those windows on which this product is applied. The clarity is far from perfect, but not an issue, its not like I intend on taking pictures through it. I should be able to turn down the speed on my fans to keep the same internal temperatures with this stuff on the windows, even with my insulated black out panels in place atop it.

now I want to see if the non mirrored jahoot, just the black stuff, attenuates the wifi signal as much as the reflective stuff so obviously does. Those back windows that these letters will pass through when i click 'post reply' can still be seen through more than I like, and perhaps i can reduce the heat coming through those too and gain some more privacy.
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#12
I put some of that black 'non mirrored' Jahoot in my passenger side front window( 17" width is not enough to cover it completely.

The Non mirrored part is in quotes, as it is more mirror like than the silver stuff.
I made a bad assumption.

Once the clear backing is pulled away it is extremely reflective. Fiona behind the black Jahoot is completely invisible where the silver stuff she was mostly invisible. The silver is much more obvious from a distance too. The black way less conspicuous It looks more like a highly polished window reflecting a black wall, instead of a mirror.

It is harder to see inside/ through it, basically impossible if there is not a light source opposite. It is darker than the Silver stuff.

I almost want to remove all previously applied tint, the adhesive stuff and the non adhesive stuff on top of it, and use this instead. but that's a lot of work and wasteful, so I'll live with it.

I've not done temp testing, the black stuff likely transmits more heat to the interior( than silver) as black colors have higher emissivity than silver, and radiate heat more efficiently. Its weird as it is black, and mirror like.

Not sure what the legal status is about window tint on the front windows in California, but I see so many vehicles with dark tint up front, even some with dark tint on windshield, and if the laws have not been changed to allow this, then they seem to not be enforcing the existing ones as it is so widespread.

This jahoot vinyl static cling stuff can be pulled off in a second.

Do you know why I pulled you over?

Surely not for dark tinted window up front , offskicker.

I basically always drive with that window open and when it gets cooler will peel it off and place it on a back window until I need to hide Fiona when parked. can reapply it without a squeegee, a wet napkin to wet the window and to push it flat is done pretty quickly too.

I've considered getting a wider roll and rolling some on front windshield when parked facing ocean all day, and wanting more privacy and heat protection when facing west, then putting it back on the roll before driving.
[-] The following 2 users say Thank You to sternwake for this post:
  • rvpopeye (10-23-2019), GypsyDogs (10-23-2019)
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#13
Another useful thread. I want to be prepared for the heat and cold much better on my next vehicle. Ive roasted and frozen in my van before a few times. But whenever I go back to the Puget Sound area I want all the solar gain I can get. So removable or hinged sun shades might make sense. And I plan on getting a dog so need to be ready. What about storm windows with solar film on them? And lots of efficient fans. Thanks Sternwake for showing what’s doable. Without tossing huge amounts of money at it. 
 I’m at last getting a test area set up so I can load test the fans I got almost a year ago. Effing Winters!!
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