What Is LoĒ-i89 Glass—and Is It Worth the Upgrade?
Most homeowners do not care about glass ratings, coating surfaces, or technical charts. They care about something much simpler:
Will my home feel more comfortable, and will this glass help reduce wasted energy?
That is exactly where Cardinal LoĒ-i89 glass stands out.
LoĒ-i89 is an energy-efficient coating placed on the room-facing side of an insulated glass unit. Its job is to reflect indoor heat back toward the room instead of allowing as much of that warmth to escape through the window.
In plain English: the glass helps keep more of your home’s heat where it belongs—inside your home.
Why Ordinary Windows Can Feel Cold
Have you ever sat beside a closed window during cold weather and still felt a chill?
That does not always mean air is leaking around the window. Sometimes the interior surface of the glass is simply cold. Your body naturally loses heat toward that colder surface, making the area near the window feel uncomfortable even when the thermostat says the room is warm.
LoĒ-i89 helps the inside surface of the glass stay warmer. That can make rooms feel more comfortable, especially near large windows, living-room glass, bedroom windows, and other areas where people sit close to the glass.
A Smarter Double-Pane Window
A standard energy-efficient double-pane window usually has a Low-E coating inside the sealed glass unit. That coating can help control outdoor heat and protect the home from solar heat gain.
LoĒ-i89 adds another layer of performance on the room side of the glass. One coating helps manage heat coming from outside, while i89 helps hold indoor warmth inside.
When LoĒ-i89 is paired with the right Cardinal Low-E glass and argon gas, Cardinal reports that a double-pane unit can deliver insulating performance better than clear triple-pane glass at the center of the glass.
That does not mean every double-pane window becomes identical to every triple-pane window. The frame, spacer, installation, glass size, and complete window design still matter. But it does mean homeowners may be able to get a substantial comfort upgrade without automatically moving to a heavier and more expensive triple-pane unit.
What Homeowners May Notice
The value of LoĒ-i89 is not a coating you are supposed to admire. It is the difference you may feel in the room.
Homeowners may benefit from:
A warmer interior glass surface during cold weather
Fewer cold spots near windows
Less heat escaping through the glass
Improved overall energy efficiency
Better resistance to interior condensation
A clear view without the heavy tint many people expect from energy-efficient glass
No glass can guarantee that condensation will never occur. Indoor humidity, outdoor temperature, window coverings, and airflow all play a role. However, because i89 helps the room-side glass stay warmer, it can reduce one of the main conditions that causes interior condensation.
Does LoĒ-i89 Make Sense in North Texas?
Yes—but only when it is used correctly.
North Texas homes need protection from intense summer heat, but we also experience cold fronts and freezing winter temperatures. That is why i89 is most effective here when it is paired with a solar-control Low-E product selected for the location of the window.
For example, a product such as Cardinal LoĒ³-366 can help reduce unwanted solar heat coming through the glass, while LoĒ-i89 helps retain indoor warmth during colder weather. Together, they provide a more complete year-round comfort package than clear glass or a basic insulated glass unit.
The right combination can vary based on which direction the window faces, how much direct sunlight it receives, the size of the glass, and the homeowner’s priorities. More coating is not automatically better. The goal is to choose the correct glass package for the home—not simply the most expensive option.
Is LoĒ-i89 the Same as Window Tint?
No.
Aftermarket window film is applied to existing glass. LoĒ-i89 is a factory-applied coating that is part of the new insulated glass unit. It is designed to improve the way the glass handles heat while maintaining a natural-looking view.
It does not create the dark, mirrored appearance many homeowners associate with window tint. Cardinal describes the coating as low-reflectance, haze-free, durable, and easy to clean.
When Is LoĒ-i89 Worth Considering?
LoĒ-i89 may be a strong upgrade when:
A room feels noticeably colder near the windows during winter
The home has large areas of glass
You are already replacing foggy, broken, or failed double-pane glass
Energy efficiency and comfort matter more than choosing the lowest upfront price
You want stronger performance without automatically replacing the entire window
You want a clearer, more natural appearance than dark aftermarket film
If your existing window frames are still in good condition, you may not need full window replacement. In many cases, the insulated glass can be replaced while keeping the existing frame. That can make an energy-efficient glass upgrade far more practical and affordable.
How Much Does the LoĒ-i89 Upgrade Cost?
Upgrading to LoĒ-i89 may cost considerably less than homeowners expect.
For an insulated glass unit measuring approximately 36" × 48", adding LoĒ-i89 to a Cardinal LoĒ²-270 glass package costs approximately $20 more per window.
A single Cardinal 270 and clear insulated glass replacement would cost approximately $345. The same replacement with Cardinal 270 and a room-side LoĒ-i89 coating would cost approximately $365.
When replacing two to four glass units, the estimated price drops to $285 each for Cardinal 270 with clear interior glass or $305 each with LoĒ-i89.
For five or more qualifying glass units, the estimated price drops to $255 each for Cardinal 270 with clear interior glass or $275 each with LoĒ-i89.
That means the LoĒ-i89 upgrade remains only $20 more per glass unit, regardless of which quantity tier applies.
For that additional $20, LoĒ-i89 helps reflect more indoor warmth back into the room, reduces heat loss through the glass, and helps the interior surface feel warmer during cold weather.
You are already paying to replace the glass. For many homeowners, spending $20 more to improve its comfort and insulating performance is the smarter long-term decision.
Use this disclaimer underneath:
Prices are examples based on approximately 36" × 48" insulated glass units and qualifying quantities. Final pricing varies based on exact measurements, property location, installation conditions, glass thickness, tempering, grids, access, and other requirements.
The Bottom Line
LoĒ-i89 is not about loading a window with impressive-sounding technology. It is about making the space beside the window feel more like the rest of the room.
By reflecting indoor heat back into the home, LoĒ-i89 can help create a warmer interior glass surface, improve comfort during cold weather, and reduce heat loss through the glass. When it is paired with the right solar-control Low-E coating, it can become part of a strong year-round glass package for a North Texas home.
If you are already replacing broken or foggy double-pane glass, that is the ideal time to ask about upgrading. The cheapest glass restores the view. The right glass can restore the view and improve the way the room feels.
Ask About Energy-Efficient Glass Options
All American Window and Screen Company replaces broken, foggy, and failed insulated window glass throughout North Texas. We can explain the available Cardinal Low-E options in plain language and help you choose a glass package based on the window’s location, sun exposure, and your comfort goals.
Call or text 940-255-4353 to request a free estimate.
Serving Justin, Northlake, Argyle, Flower Mound, Bartonville, Lantana, Haslet, Keller, Roanoke, Grapevine, Lewisville, Denton, North Fort Worth, Rhome, Bridgeport, Decatur, Ponder, Highland Village, Southlake, Boyd, and surrounding North Texas communities.
