What are energy-efficient LOW-E Argon thermopane windows?

An energy-efficient thermopane window with LOW‑E Argon means that during colder seasons, the window allows the sun’s rays to penetrate into the home, letting in heat and light. As well, it limits the escape of heat outward. In the warmer summer months, the windows limit the amount of seasonal heat as well as that produced by various sources (paved driveway, vehicles, etc.) from entering, while nonetheless allowing the light in.

LOW-E Argon logo

LOW‑E

LOW‑E is a virtually invisible metal oxide coating applied to window’s glass during the manufacturing process while the glass is still hot. It is this film that interacts with the rays of the sun.

Argon

A regular thermopane window has simple air between the two panes. This air has some insulation properties but they are very weak. Argon is the most commonly used gas in the manufacture of windows because it is an excellent thermal insulator. It thus reduces consumption of electricity such as used to heat a room. In addition, Argon is colorless, odorless, tasteless and non-reactive to other bodies. In fact, this inert gas is used in the preservation of fruits and vegetables where it is added to bags when packaged to play a key role in preservation.

Combining LOW‑E and Argon

When combined together, LOW‑E and Argon gas make a formidable team to combat both cold and warm weather. Energy-efficient LOW‑E Argon thermopane windows are thus a product that effectively controls temperature variations.

Is the thermal resistance factor better?

Yes, if you compare it with a double-pane sealed window without LOW‑E Argon. You increase your energy efficiency, especially if you have garage door with many decorative windows.

Insulating Glass Unit Performance
(3mm double-pane sealed window with 12.7mm spacer)

2 clear panes with air space

R Factor

2.0

Solar gain

0.75

Transmitted light

81%

1 clear pane and 1 LOW‑E pane with Argon

R Factor

3.6

Solar gain

0.68

Transmitted light

79%

Insulating Glass Unit Performance

(3mm double-pane sealed window with 12.7mm spacer)

  R Factor Solar gain Transmitted light
2 clear panes with air space 2.0 0.75 81%
1 clear pane and 1 LOW‑E pane with Argon 3.6 0.68 79%
Insulating Glass Unit Performance
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