3M “Prestige” window film test
Some years ago, I was approached by 3M with an offer on their heat reduction window film called “Prestige”. My pilot house, as you can see, is basically a greenhouse. I installed new windows about two years ago with the idea that I would add air conditionIng before we went cruising. With the new windows, the inside (windows closed) temperature on a 90° June day was 109 at waist level, and 113 at eye level. It was simply too hot to use A/C. A 9000 BTU floor unit running all day only made a two degree difference in the 8 x 12 space. I had to do something more. Maybe if I could reduce the temperature 10 degrees or so, an A/C might have a chance.
A knew a few of the new Krogen 52 and 58 owners who had the film installed, claiming great heat reduction so we went ahead with it. We used 20% tint on the windshield and two forward side windows, the 40% on everything aft of the pilothouse doors, 9 windows in all, about 75 sq. Ft.. cost for everything was $900.
I waited for a 90 degree day and checked out the temps. Keep in mind that this is not a closed, sterile laboratory, controlled environment situation. The comparisons are made with similar conditions of very little wind, bright sun at similar times of the year and hour of the day with outside temperature of 90 degrees. Here are the results:
-Before 3M film was applied, Pilothouse closed.
Outside temperature, 90 degrees F
Inside temperature at waistline, 109 degrees F
Inside temperature at eye level standing, 113 degrees F
Total temperature difference was 19 to 23 degrees F
-After 3M film was applied, Pilothouse closed
Outside temperature, 89.9 degrees F
Inside temperature at waistline, 95.5 degrees F
Inside temperature at eye level standing, 99.6 degrees F
Total temperature difference was 5.6 to 9.3 degrees F
This, for your info.
"When life gets hard, eat marshmallows”.