As sustainability becomes an overarching goal for companies, demand for eco-friendly solutions among designers and homebuilders continues to grow. Thus, window film is quickly gaining traction as an effective upgrade for net-zero energy buildings projects.
While most homeowners know window film as a passive design feature that increases comfort, it actually does play a major role in energy conservation and sustainability. For this reason, window film is often included in zero net energy building (ZNEB) projects. Such projects are optimally efficient and create energy onsite using renewable resources equal to or greater than the amount consumed by the building.
The Sustainability Barriers in NZEB Projects
The equilibrium that NZEB projects sets for itself is much harder to achieve than it seems on paper. Windows, surprisingly, remain one of the key weakest points in the building when it comes to energy expenditure, setting them up for a slew of sustainability challenges
Excessive Solar Heat Gain
Large glass facades of modern offices certainly pack a visual punch. Yet, they also act as a massive solar radiation intake mechanism. Operators of such buildings often struggle with indoor temperature control and waste significantly more energy to keep temperatures at optimal levels.
Poor Insulation and Thermal Leakage
Poor glazing solutions do not offer proper thermal resistance, which leads to heat loss during colder months and heat gain during summer months. Energy modeling forecasts, which are key for NZEB projects, are much harder to achieve in such environments.
Glare and Visual Discomfort
More light usually means more glare as uncontrolled daylight reduces the comfort of occupants, forcing them to employ blinds/curtains, which often necessitates the use of artificial light during the day.
Cost and Complexity of Window Replacement
Replacing existing windows with multi-pane windows is expensive, disruptive, and carbon-intensive.
Need for Scalable, Fast-ROI Solutions
LEED, BREEAM, WELL, and EU energy performance directives and other sustainability frameworks all push for fast energy efficiency. NZEB projects need solutions that don’t require large upfront investments and can save energy as fast as possible.
How Window Film Contributes to NZEB Energy Performance
When it comes to sustainable building strategies, employing window film represents a powerful solution that has significant environmental benefits at an affordable price point. These solar control window films help control indoor temperatures by reducing heat transfer via glass. In turn, this means the heating or cooling systems don’t have to work as hard, ultimately reducing greenhouse gas emissions from power plants.
Window film either absorbs or reflects sunlight (depending on the type of the film) entering through glass surfaces. It is estimated that roughly 30% of a building's energy used for heating/cooling is lost through windows. It’s possible to reduce this loss by using energy-efficient window films, like the Solar 80C. For this reason, these films can be used to meet green building certifications.
Similar to the construction industry, window film production companies are also adopting eco-friendly methods. This means the usage of sustainable development and eco-friendly components. Polyester-based plastic and non-toxic adhesives have become a staple in the industry, while some companies also create biodegradable or recyclable films.
Finally, window film can help extend the life of window glass thanks to its shielding properties. This reduces the need for replacement, but also reduces glass waste caused by window glass debris. Such debris often ends up in landfills, which are then recycled, increasing greenhouse emissions.
Quantifying ROI: Economic and Environmental Payback
The biggest advantage of window film in NZEB projects is the instantaneous energy savings. Window film offers a rare combination of low upfront cost, immediate performance gains, and strong long-term returns.
The list below outlines some of the main ways in which payback is achieved via window film in NZEB projects:
- Help buildings stay compliant with energy codes
- Improves metrics for certifications (LEED, BREEAM, etc.)
- Reduces carbon footprint by reducing HVAC operations
- Reduces maintenance needs for HVAC systems due to decreased exploitation
- Reduces embodied carbon by extending the life of windows
- Reduces energy use
- Creates predictable energy profiles
Conslusion
Window film for net-zero energy buildings is a clever and environmentally responsible solution that serves multiple roles in NZEB projects.
For designers and homebuilders, window film serves as a key tool for greener and more sustainable living.
Utilizing them, designers and builders can reduce carbon footprint, ensure longevity of windows and HVAC systems, postpone window replacement, and create predictable energy needs for the building. Thanks to recent technological advancements, modern window film is increasingly using sustainable practices in the creation of high-performance film, which means that in the future, it will play an even greater role in eco-friendly building practices.
You can also explore the Solar Screen blog to see how complementary solutions support sustainable building goals.