Building managers across downtown Salt Lake City and the broader Wasatch Front increasingly rely on window film in Salt Lake City to cut cooling costs and improve occupant comfort. With so many products on the market—each with distinct performance ratings—understanding how to compare energy efficiency metrics is essential before investing in a commercial retrofit. This guide breaks down the key ratings that matter, compares films from the brands we install, and explains how those numbers translate to real-world savings for Salt Lake City properties.
Understanding the Ratings: Shgc, Tser, and Vlt
Three primary metrics determine how much energy a window film can save. Solar Heat Gain Coefficient (SHGC) measures the fraction of solar radiation transmitted through a window—lower values mean less heat enters the building. Total Solar Energy Rejected (TSER) is the complement: it represents the percentage of total solar energy blocked by the film, so higher is better. Visible Light Transmittance (VLT) indicates how much natural light passes through, which affects both daylighting and glare.
The U.S. General Services Administration has studied low-e window film retrofits in federal buildings and found 29% average perimeter HVAC savings compared to single-pane clear glass. That kind of reduction matters for Salt Lake City commercial buildings facing hot summer afternoons along the Wasatch Front.
3m Window Films: Prestige Series Performance Data
3M’s Prestige Series window films use multilayer optical technology to reject heat without darkening the glass. These non-metallic films avoid signal interference with cell phones and Wi-Fi—a practical advantage for office buildings in the Sugar House and Research Park areas where connectivity is critical.
The 3M Prestige 40 film delivers a TSER of up to 97% (on 6mm single-pane glass), blocks up to 99.9% of UV rays, and maintains a VLT of 40%. The Prestige 70 offers a higher VLT of 70% with a TSER of up to 97%, making it suitable for spaces where maximum daylight is desired without sacrificing heat rejection. For a detailed comparison of 3M products available for your building, see our 3M window film options.
Vista Window Films: Energy Series Specifications
Vista Energy Series films from Eastman Chemical are engineered specifically for commercial energy reduction. The Vista VE 115 film achieves a TSER of 73% on single-pane glass with a VLT of 35% and an SHGC of 0.27. For buildings needing a lighter appearance, Vista VE 175 offers a VLT of 50% and a TSER of 66% on single-pane glass.
What sets Vista apart is its proprietary Low-E coating, which reduces winter heat loss through the glass as well as summer heat gain. That dual-season performance is valuable in Salt Lake City, where January temperatures routinely drop below 20°F and July afternoons exceed 95°F. Our Vista window film page lists the full Energy Series lineup with detailed specifications.
Llumar Window Films: Performance and Value
Llumar’s energy-control films provide strong performance at a competitive price point. The Llumar ATC 35 film offers a TSER of 60% on single-pane glass with a VLT of 35% and 99% UV rejection. For higher light transmission, Llumar NRM 35 delivers a TSER of 55% while maintaining excellent optical clarity.
Llumar films carry Eastman’s manufacturer warranty, which covers bubbling, peeling, and color change for the life of the product. That warranty backing is especially important for large commercial installations in high-visibility locations like The Gateway or City Creek Center.
Side-by-side Comparison for Salt Lake City Buildings
The following comparison highlights how films from each brand perform on the metrics that most affect energy costs. These values reflect single-pane glass installations, which are common in older commercial buildings throughout South Salt Lake and West Valley City.
- 3M Prestige 40: TSER 97%, VLT 40%, UV rejection 99.9%, SHGC 0.03
- Vista VE 115: TSER 73%, VLT 35%, UV rejection 99.9%, SHGC 0.27
- Llumar ATC 35: TSER 60%, VLT 35%, UV rejection 99%, SHGC 0.40
- 3M Prestige 70: TSER 97%, VLT 70%, UV rejection 99.9%, SHGC 0.03
- Vista VE 175: TSER 66%, VLT 50%, UV rejection 99.9%, SHGC 0.34
Higher TSER values translate to greater heat rejection, but the right choice depends on your building’s orientation, glazing type, and occupancy pattern. A south-facing office tower near Temple Square has different solar exposure than a warehouse in the northwest quadrant of the valley, and the film selection should reflect that.
How Ratings Translate to Real Savings
A film’s TSER rating only tells part of the story. The actual dollar savings depend on the building’s total glazing area, local utility rates, HVAC equipment efficiency, and the percentage of perimeter zone area affected. The Department of Energy’s Better Buildings initiative has documented that window retrofits can reduce commercial building energy use by 4–6% site-wide, with perimeter zones seeing substantially higher reductions.
For a 20,000-square-foot office building in Salt Lake City with single-pane glass, installing 3M Prestige 40 film could reduce perimeter HVAC loads by 25–30% during summer months. With Rocky Mountain Power’s commercial summer rates, that translates to meaningful annual savings on cooling costs alone—before accounting for the improved comfort that often reduces tenant complaints and extends HVAC equipment life.
Choosing the Right Film for Your Building
Selecting window film in Salt Lake City requires matching the film’s ratings to your building’s specific conditions. Here are the key factors to evaluate:
- Glass type: Single-pane, double-pane, and low-e glass each interact differently with film. A film that performs well on single-pane may deliver different results on an insulated unit.
- Window orientation: South and west exposures receive the most solar heat. Priority zones for high-TSER film are typically these orientations.
- Occupancy schedule: Buildings occupied primarily during daytime hours benefit most from high-VLT films that reduce artificial lighting loads alongside cooling.
- Aesthetic requirements: Historic buildings in the Exchange District or landmark properties may require nearly invisible films to preserve architectural character.
Our team at Commercial Window Tinting Salt Lake has installed energy-efficient window film in Salt Lake City across office towers, medical facilities, retail centers, and educational buildings. We assess each property’s glazing, orientation, and usage patterns before recommending a specific product from 3M, Vista, or Llumar.
Start Your Energy Efficiency Upgrade
If you are evaluating window film in Salt Lake City for your commercial property, contact us for a site assessment and energy analysis. We will measure your existing glass, calculate projected savings based on your building’s orientation and utility costs, and recommend the film that delivers the best return on investment. Call us or request a quote online to schedule a consultation at your Salt Lake City property.
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