Will homeowners notice a difference in the amount of sunlight through their windows if they replace clear glass with low-e glass

Initially the homeowner may be aware of a slight reduction in the intensity of light coming into their homes compared to the old windows. When sunlight is coming directly through windows in which clear glass has been replaced with low-e glass, most people say that the low-e is more comfortable because they feel less heat and glare from the sun. An insulating glass unit with Solarban® 60 solar control low-e glass transmits about 13 percent less visible light than an insulating unit with all uncoated clear glass, and about 48 percent less total solar energy.

Should homeowners consider PPG low-e glass in some windows and not others?

PPG Low-e glass can improve window performance for all exposures all year round. For example:

  • In the winter, while PPG low-e glass retains heat no matter which direction the window is facing, it can be especially useful on north-facing windows because they resist heat loss.
  • PPG low-e glass is useful for east, west, and south facing windows because it helps reduce solar energy transmission.
  • PPG low-e glass helps prevent heat from escaping regardless of exposure, even at nighttime, helping reduce heating costs
What Is Powder Coating?

The powder coating process uses a solvent free dry mix of plastic resins, pigments and fillers that melt and fuse together when heated. The solid particles of coating are electrostatically charged in a spray gun and carried by low velocity air to the surface of the piece to be coated. The electrostatic charge holds the powder particles in place while the part is cured in a 400-degree oven. The heat of the oven causes a chemical reaction to occur and the powder to cure, creating a highly durable finish.

Is Powder Coating Environmentally Friendly?

Powder coating is an environmentally friendly process unlike solvent-based wet paint systems. With EPA regulations growing ever stricter, powder coating is fast becoming the technology of choice. Since the powder coating process does not use solvents in any way, VOC emission problems are eliminated.

How does the thermal strut effect the performance of the window?

Aluminum has many tremendous advantages including structural integrity, sustainability, design flexibility etc. however aluminum has high thermal conductivity. Adding insulating thermal Polyamide strips to the framing members to separate the inside and outside metal greatly enhances the product thermal performance and reduces the amount of heat transfer, therefore saving energy while increasing occupant comfort.

With lighter colors indicating higher surface temperatures, the above diagrams show heat transfer through a non-thermal aluminum product, vs. an aluminum product with a thermal barrier using polyamide strips.

Can thermal insulating strut contribute to earning performance points toward LEED® Certification, the Green Building Rating System?


  • Energy & Atmosphere
  • Optimize Energy

Performance by achieving increasing levels of energy performance above the prerequisite standard to reduce environmental impacts associated with excessive energy use.

  • Indoor Environmental Quality
  • Thermal Comfort, Design

By providing for a comfortable thermal environment that supports the productivity and well-being of the building occupants.

Are there dry shrinkage issues with strut thermal break?

The glass filled polyamide strut provides a positive mechanical bond, with no thermal break slippage. Furthermore, Technoform’s strut is made of fiberglass reinforced polyamide with glass fibers oriented in 3 directions for optimal structural performance.

How AlumaTherm® products can contribute to your projects LEED certification:
  • Credit 1.1“Optimize Energy Performance” with AlumaTherm® thermally broken window systems.
  • Credit 2.0“Increased Ventilation” with AlumaTherm® Parallel Plus window operation system to create airflow patterns.
  • Credit 2.1Construction Waste Management, Divert 50% from Disposal
  • Credit 2.2 Construction Waste Management, Divert 75% from Disposal
  • Credit 3.1– Construction Indoor Air Quality, During Construction.  AlumaTherm® no voc powder coating.
  • Credit 3.2– Construction Indoor Air Quality, Before Occupancy.  AlumaTherm® no voc powder coating.
  • Credit 4.2– Low-Emitting Materials, Paints.   AlumaThrerm® no voc powder coating.
  • Credit 4.1
  • Recycle Content 10%
  • Credit 4.2
  • Recycle Content 20%
  • Credit 5.1
  • Regional Materials 10% Extracted, Processed & Manufactured
  • Credit 5.2
  • Regional Materials 20% Extracted, Processed & Manufactured
  • Credit 8.1“Daylight and Views (daylight 75% of spaces)
  • Credit 8.2: “Daylight and Views (views for 90% of spaces)
Why is LEED important?
  • Conserve natural resources
  • Reduce operating costs
  • Enhance occupant comfort and health
  • Minimize strain on local infrastructure
  • Enhance asset value and profits
  • Contribute to overall quality of life
Aluminum Benefits
  • Extremely easy to maintain and corrosion-resistant
  • Light to transport which leads to reduced fuel costs
  • Recyclable and reusable
  • Modern and sleek design
Why is my bedroom window covered in moisture early in the morning?

This question is often asked by homeowners who have highly energy-efficient windows. This condition usually occurs in late summer and early fall when the night time temperatures drops several degrees.

The moisture on the outside of the window is condensation. It will soon evaporate when outside temperatures rise. As we know, condensation happens on cold surfaces. During the night, if the outside temperature drops below the dew point then condensation forms. The fact that the condensations forming on the windows mean that very little heat from inside the house is escaping through the windows. That’s a good thing and proof that you have energy-efficient windows.

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