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Guest tintslut

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Guest tintslut

Some crazy lady called , she wanted window tinting that would stop the cold from coming thru the windows.

She had a company come out and measure for blinds, but they suggested TINTING to prevent the cold from coming in :evileye

GUess whe would be real pissed when she realized the room would be even colder during the day :evilgrin

HEY METINT, I see TOtal solar energy rejection for r -20,, whats the cold reduction factor :sign

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Some crazy lady called , she wanted window tinting that would stop the cold from coming thru? the windows.

She had a company come out and measure for blinds, but they suggested TINTING to prevent the cold from coming in :evileye

GUess whe would be real pissed when she realized the room would be even colder during the day :sign

HEY METINT, I see TOtal solar energy rejection for r -20,, whats the cold reduction factor? :lol

[*]219100

Riiiiiigght! :evilgrin

The U-Value (or U-factor) indicates insulating performance value of window film... LLu's E1220 would be best. All others run very near each other...

U-value

The U-value (sometimes called the "U-Factor") should be understood as the overall heat transfer coefficient of the glazing system. The U -value is a measure of the heat transfer that occurs through the glazing system between its outer and inner surfaces. This value is a function of temperature, and is expressed in BTUs per square foot per hour per degree Fahrenheit (BTU/ ft2/hr/degree F). The lower the U- Factor, the better the insulation qualities of the glazing system. Alternative definition: The "coefficient of heat transfer;" a measure of the ability of a material to resist heat transfer. The number is actually the number of BTUs per square foot per hour per ?F of temperature difference across a barrier. The lower the U value, the slower heat moves by conduction through the material.

U-Value and R-Value measurements are similar?but reciprocal?in nature. They quantify the rate at which heat is transferred through a material due to temperature differences between its opposing surfaces. The window films industry uses two standards of measurement to determine U-values for glazing systems:

AIMCAL Median Winter Conditions ("Winter Median U-value"): With (a) the outside temperature set at 45?F, (b) the inside temperature set at 68?F, ? no sunlight illuminating the glass, and (d) the outside wind speed set at 15 mph, the "Winter Median U-value" can be measured in terms of the number of BTU?s per square foot per hour lost through the glass.

ASHRAE Summer Conditions ("Summer Conditions U-value"): With (a) the outside temperature set at 89?F, (b) the inside temperature set at 75?F, ? sunlight illuminating the exterior of the glass at the intensity of 248 BTUs per square foot per hour, and (d) the outside wind speed set at 7? mph, the "Summer U-value" can be measured in terms of the number of BTUs per square foot per hour gained through the glass by conduction and re-radiation.

Other professional engineers in the insulation and construction industry use the measure of "R-Value," which denotes a material's ability to act as an insulator. The higher the R-Value, the slower the heat transfer rate; it is the reciprocal of the U-Value, expressed as R = 1/U. A window with a U-value of 0.25 has an R-value of 4.0 (1 divided by 0.25).

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People want film for whatever reason. Don't call them crazy and turn them down. ( Except it is not lucrative like 2 lites 15 ft. high) You can't stop the cold from getting in but you can slow down the heat transfer (conduction) to the outside. And actually with a lot of single pane glazing in your area films designed for that purpose can give you quite some performance. It's up to you then whether you want to tell your customer that the same film decreases the heat gain from the winter sun. But even if you have a lot of sunny winter days how many hours out of 24 would that be a day?

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