New York City Local Law 97

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"We are going to ban the classic glass and steel skyscrapers, which are incredibly inefficient."

-Former Mayor Bill de Blasio

3M Thinsulate Helps LL97 Compliance

New York City has pledged to reduce greenhouse gas emissions (40% by 2030 and 100% by 2050) for a greener tomorrow. Given that buildings account for 70% of all GHG emissions in NYC, legislation was passed to require owners to reduce their buildings’ carbon emissions. This legislation, titled Local Law 97 (LL97), is an ambitious program that brings attention to a building’s envelope efficiency in addition to lighting and HVAC.

In late 2019, Mayor Bill de Blasio made the comment that New York City needs to ban all glass skyscrapers because of their inefficiency. Yet, glass-intensive buildings are a recent architectural trend. They look great, allow in a lot of natural light, and provide for fantastic city views. Despite the use of high efficiency glass, these building envelopes are energy inefficient overall because of the amount of glass that is incorporated into their curtain walls.

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City government is putting pressure on building owners through LL97 to reduce their carbon footprint by addressing the inefficiency of the building envelope, or else face significant penalties for non-compliance. Whether you have a building made of single pane glass, double pane glass, Low-E glass, or high efficiency glass, glass heavy buildings often have an inefficient building envelope. There is great opportunity for energy savings and carbon footprint reduction by making existing windows more energy efficient.

40% GHG reduction
by 2030

100% reduction
by 2050

Why Are All Glass Buildings Generally Energy Inefficient?

It is because windows are generally inefficient. Look at what the U.S. Department of Energy has to say:
According to the DOE, the energy used to offset unwanted heat losses and gains through windows in residential and commercial buildings

costs the United States $20 billion

(25% of all the energy used for space heating and cooling).
According to the DOE, windows are responsible for as much as

30% of the total cooling load

in commercial buildings.
Even windows that are labeled high efficiency are more inefficient than other curtain wall building materials such as brick, limestone, concrete, metal panel systems, and the insulation and drywall that is behind them. As time passes and buildings make lighting and HVAC upgrades to increase energy efficiency, the inefficiency of vision and spandrel glass often goes unaddressed.
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Window Film: Improving Building Efficiency Without Replacing Windows

3M Company, makers of Post-it Notes and Scotch Tape, can reduce the inefficiencies of an existing window with a retrofit product that it has been manufacturing for over 50 years – window film. The technology of window film has drastically evolved over these past 50 years to the point where an invisible retrofit film, known as 3M Thinsulate Climate Control 75, is almost the equivalent of window replacement. Installing it is almost like adding an additional pane of glass because it can reduce your existing window’s solar heat gain coefficient and U-Value, which allows your building to consume less energy to cool and heat twelve months out of the year. And all without changing your building’s appearance, which makes Landmarks happy if the building is historical. (Be sure to check with LPC prior to any envelope changes.)
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Compare retrofit window film installation to window replacement, which is costly, disruptive to tenants, noisy, and environmentally unfriendly as the old window units get thrown right into a landfill. Window replacement, especially if you’re converting from single pane glass to double pane or double pane glass to triple pane, adds a significant amount of weight to the building. There may be structural load implications that need to be considered.

But that’s not the case with 3M Thinsulate Climate Control 75. The installation process is cost-effective, quiet, and quick. And because we’re installing a plastic film to the glass rather than additional glass, there should be no structural load implications.

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3M Thinsulate Value Proposition

  • Increase efficiency of existing windows
  • 12-month utility savings (heating and cooling)
  • Reduce carbon footprint
  • Help achieve compliance for local regulations
  • Virtually no change to building’s appearance
  • Rebates and PACE funding available
  • 15-year warranty

How Effective Is 3M Thinsulate Climate Control 75 Window Film?

Take a look at some performance characteristics of generic single and double pane window units.
SHGC U-Value
Before After Before After
Single Pane Clear 0.82 0.53 1.03 0.63
Single Pane Tinted 0.63 0.40 1.03 0.63
Double Pane Clear 0.70 0.51 0.47 0.35
Double Pane Tinted 0.51 0.37 0.47 0.35
  • First, see how Thinsulate reduces a window’s SHGC and U-Value, which in turn reduce solar heat gain and winter heat loss, respectively.
  • Second, see how Thinsulate reduces a clear pane’s SHGC to that of almost a tinted pane.
  • Third, see how Thinsulate reduces a single pane’s U-Value to that of almost a double pane.
  • Most important to note is that we can improve the performance of most any window, whether it is old or new, single or double pane, clear or tinted, regular or high-efficiency.

What Does All of This Mean?

During the summer, when it is hot outside, much of the sun’s energy or heat is coming into a building through its glass. Part of the sun’s energy is reflected and absorbed by the existing window. What isn’t reflected or absorbed is transmitted through the window, or enters the building. It is that transmitted energy that causes problems such as uncomfortable temperatures, the need for air conditioning, temperature imbalances, and glare. Applying window film increases the amount of the sun’s energy that is reflected and absorbed by the existing window, thereby decreasing what was transmitted. Decreasing the amount of energy that is transmitted, in other words, decreasing the amount of heat that enters the building, is the film's ultimate purpose.

During the winter, when it is cold outside and you’re running your heating system, much of that heat is escaping the building, especially through its glass. Window film reflects much of that heat back inside which means the room stays warmer and you use your heating system less. And many commercial heating systems are powered by natural gas, or steam which is a byproduct of natural gas, thereby increasing a building’s carbon footprint.

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Reducing solar heat gain in the summer and heat loss in the winter is what helps the building reduce its energy consumption, utility bills, and carbon footprint.

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What Con Edison Has to Say About 3M Window Film

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What Kind of Temperature Improvement Can Window Film Provide?

It’s one thing to talk about how 3M window film improves the efficiency of a window, it’s another thing to see and feel it for yourself.

Here are the results of an experiment that was conducted during the cooling season (summer). Three identical, side by side, vacant rooms were identified in a building. The windows of two rooms were filmed while the third room was left untreated. The temperature of each room was taken and recorded in regular intervals over the course of a week.

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What you see here is that the two rooms with film were cooler than the room without film. During the hottest part of the day, that difference was as high as 9° Fahrenheit. In other experiments, it has been as high as 16°. Any facility engineer will tell you what a 4°-5° reduction means, let alone 9° or 16°. That means less tenant complaints, reduced energy costs, prolonged HVAC life, and a reduced carbon footprint.
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How Do I Know If 3M Thinsulate Is Right for My Building?

We offer the following at no cost or obligation:

  • Product demonstrations
  • Sample installations
  • Calculate change in glass specs
  • Energy model assistance or completion
  • Assistance with rebate application
  • Assistance with PACE funding
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