Cardinal LoĒ²-270 is very similar to our LoĒ²-272® glass, only with slightly more solar control, while LoĒ²-272 offers a little more light transmittance.
Solar control for just about the coolest windows under the sun.
Frigid outside, cozy inside.
Inside glass and outside temperatures.
- Single-pane, clear
- Double-pane, clear
- Ordinary low-e (air fill)
- LoĒ² – 270 (air fill)
- LoĒ² – 270 (argon fill)
- Outside temp -20°F (-30°C)
- 0°F (-19°C)
- 37°F (2°C)
- 46°F (7°C)
- 49°F (9°C)
- 52°F (10°C)
- Outside temp +20°F (-10°C)
- 31°F (-3°C)
- 51°F (9°C)
- 57°F (13°C)
- 58°F (14°C)
- 60°F (15°C)
Save energy with glass so smart, it can control your comfort.
Savings values are average of multiple locations within climate zone.
“Average” house as described in the Buildings Data Book at http://buildingsdatabook.eren.doe.gov/TableView.aspx?table=2.2.7 The model house is described as a mid-1970’s single-story dwelling with natural gas furnace, central air-conditioning, adequate insulation, and double-pane windows.
Window orientation set as uniformly distributed on all sides to represent a neighborhood average and the total window area set to 15% of the floor area.
Interior shading devices are presumed to be closed 50% of the time throughout the year.
“Fixed Thermostat” conditions are 70°F for heating and 75°F for cooling.
“Equal Comfort” thermostat settings determined using window thermal comfort research from the University of California at Berkeley (http://www.cbe.berkeley.edu/research/pdf_files/SR_NFRC2006_FinalReport.pdf). The existing double-pane windows used heat/cool thermostat setpoints of 72°F/74°F to match the comfort of LoĒ²-270 glass at 70°F/78°F.
House heat/cool energy simulations used the Resfen program from Lawrence Berkeley National Lab (http://windows.lbl.gov/software/resfen/resfen.html).
- Single-pane, clear
- Double-pane, clear
- Ordinary low-e
- LoĒ² – 270
- Visible Light
- Solar Heat Gain
- Winter U-Factor
(Air / Argon )
- 1.04 / –
- 0.48 / –
- 0.34 / 0.30
- 0.30 / 0.25
Solar Heat Gain Coefficient – (SHGC) – The amount of solar radiation that enters a building as heat. The lower the number, the better the glazing is at preventing solar gain. Fading Transmission – The portion of energy transmitted in a spectral region from 300 to 600 nanometers. This region includes all of the ultraviolet energy and part of the visible spectrum, and will give the best representation of relative fading rates. The lower the number, the better the glass is for reducing fading potential of carpets and interior furnishings.
U-Factor – This represents the heat flow rate through a window expressed in BTU/hr·ft²·°F, using winter night weather conditions of 0°F outside and 70°F inside. The smaller the number, the better the window system is at reducing heat loss.
Cardinal actively supports and participates in the National Fenestration Rating Council (NFRC). Windows with LoĒ²-270 that are rated and certified by the NFRC can comply with Energy Star™ requirements for the northern and central regions of the country. Northern zone will likely require the addition of LoĒ-i89 on the 4th surface to comply with U-Factor requirements. (See https://www.energystar.gov/index.cfm?fuseaction=find_a_product.showProductGroup&pgw_code=WI for more information on the Energy Star windows program.)
The difference is clear.
LoĒ²-270 can be purchased in hurricane-resistant laminated glass in a variety of shapes and sizes.
More About Cardinal
Since 1962, Cardinal's mission has been to provide the highest quality glass products for residential windows throughout the world.
Today we’re the largest fabricator of sealed insulating glass units and supply over half the low-emissivity coatings used in North America. We now distribute our energy efficient and durable glass products worldwide.
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