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if alow e window has a .28% shgc how will prestige film compete with that is prestige 70 or 60 at .18% on a 70 to 90 degree angle
Low E or “low emissivity” is glass that has been coated to reflect far infra-red back into a room. This affects the U Value of a window and not the SHGC unless your widow has coatings on surface #2 & #3. A SHGC of .28 leads me to believe that is probably the case. Your window is performing very well so Prestige 60 or 70 is not going to give it significant solar energy rejection. The only benefit you may get is increased UV rejection. A less expensive window film can do that just as well.
Sun Angle is more of a marketing ploy than anything else. See vc’s blog on this subject.
-WFO
I have read your blog with great interest, and I find the articles both informative and extremely helpful. What I am wondering is what relationship the authors have to this site? I notice that you seem to push using films that are NFRC rated for the most part. (Just wondering whose payroll you are on, thats all…lol)
Deep
Thanks for the comment Deep!
I believe the “about” page explains it all. No one around here is on anybody’s payroll. You may want to re-read some of vc’s blogs because I see him “pushing” the window film industry as a whole to get all films NFRC Certified more so than any particular film brand. I find his reasoning hard to argue with.
-WFO
As the editor of CPFilms’ Technical Updates newsletter, and author of the article on infrared transmission in Issue 10, I want to thank you for your interest and enthusiasm for the work we do in technical services here at CPFilms. On Monday, September 8, Issue #11 will be published containing a follow-up article of equal and far-reaching importance. Fasten your mental seat belt–it should be quite a ride, and altogether “illuminating.”
Nice article Joseph, I kinda of figured there would need to be a follow-up to “illuminate” us all. More facts need to transfer inward so that window film professionals can warm up to new thinking. Thanks for visiting, we’re looking forward to the next issue. Have a great weekend!
Joseph,
Well, it was two days late but well worth the wait.
Issue #11 contains
a fascinating article to say the least, it definitely deserves some press from this blog site as it concerns the reputation of our industry. I also see some serious questions that will arise from the information published in light of new industry achievements. Perhaps, another follow up to this subject?
Thanks for all of your hard work.
-vc
Dear Joseph,
I have great interest in your blog as it’s very informative. Recently, i got a solar film for my room to try out first before applying it to my house. I wonder if this specification of the film i use is good to cool down my room.
I notice that the film i got is too dark.
Kindly advice.
Visible Light Transmittance (VLT) : 6%
Solar Energy Transmittance (SET) : 7%
Solar Energy Absorbence (SEA) : 45%
Solar Energy Reflectance (SER) : 48%
Total Solar Energy Rejected (TSER) : 83%
Ultra-Violet Rejected (UVR) : 99%
Thickness : 1.5 mil
Thaddeus,
Thank you for your kind words. Vclimber always says that window film does not cool rooms, air conditioners cool rooms. Technically speaking, he is correct. The film you are using will reject 83% of the total solar energy which will reduce the “heat gain” thus making it more comfortable and reducing the load that is placed on your air conditioner. The film that you purchased is very dark and it is also very reflective which is why it performs so well. Professional window film companies carry a variety of films that are much lighter and in many cases far less reflective. A well-trained professional can help you find the right balance between visible light transmittance, film reflectivity, and total solar energy rejection. Many companies offer free estimates as well as comprehensive warranties. You might want to check into this.
Take care,
-WFO