What Makes A Window Energy Efficient?

By: | May 28 , 2021

Kudos to energy

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Kudos to energy

Breathe high, breathe low
Go the neo-window way
Fix it and seal it, pro-per-ly
Argon and Krypton
Fed into the spacers
Neat job done
Heat loss to the minimum
Your home- a cubby hole
Warmed and comforted
You are ready for work
The next time

While some windows, doors and skylights are good at keeping you

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Framing materials:

Windows come in various framing materials. All these provide varying energy efficiency to your windows.

    1. Fiberglass frames are strong, durable and need low maintenance and also give good insulation.
    2. Vinyl frames also need little maintenance and give good thermal insulation. Its sections maybe hollow or filled with insulating foam material. Wider vinyl sills can be made stronger by using metal or wood.
    3. Aluminium: Durable, need low maintaining , are recyclable, have 15% recyclable content. The frame design includes thermal breaks to reduce conductive lossthrough the metal.
    4. Wooden frames are strong,good insulators and are mostly found in older traditional homes. Their external surfaces might be covered with aluminium or vinyl to reduce maintenance and weather sensitivity as wood can rot with moisture or rain.
    5. Combination frames are a mix match of various materials to give some optimum performance. For example the external frame maybe vinyl and the internal half maybe wood.
    6. Composite frames are made of various materials which are blended together through processes of manufacture to create durable, well-insulated and low maintenance windows.


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glass pack

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Selecting the appropriate glass pack for your window to be energy efficient in its optimal way, one must consider all the various components.

    1. Panes of glass: Newer windows are mostly DP or TP. It might not be that but these are better as they have insulating spacers filled with air or gas and reflect most heat creating more energy efficiency.
    2. Edge spaces which warm: These are most important as a leakage here can cause a lot of trouble.
    3. Gas fills: These could be inert gases like Argon or Krypton which are great insulators as they are dense and slow movers so prevent heat loss from within. In summers the heat from outside cannot get in much keeping the house cooler. These are filled into the spacers between the glass panes in DP orTP windows.
    4. Low-emissivity glass windows have a metallic coating on your glass pane and, is almost invisible. These reduce solar heat gain and protect against UV rays so preventing your curtains, carpets and upholstery from fading.


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LOW E windows- What are they and why are they important for energy efficiency.

It minimizes the UV and infrared rays that can come in through your windows, reducing the amount of heat entering your home without affecting natural visible light.

It also brings consistent temperature in your interiors.

Read Post: How to Fix Foggy House Windows

To measure the effectiveness of the coating certain factors have to be considered.


Solar heat gain coefficient (SHGC) This is the part of incident light or solar radiation which your window is transmitting.

  • U-Value : Rating given to a window based on how much loss of heat it allows.
  • VLT- Visible light Transmittance: How much visible light is being transmitted.
  • Light to solar gain- Ratio between window`s visible light and SGC rating.
  • There are many types of Low-e-glass coating. How can you decide which is best for your type of climate.

There are mainly two types:

  • Passive low-E coatings or Hard coats. Made using pyrolytic process giving a pyrolytic coating. This is applied to glass ribbon while it is being made on the floatline which makes the coating fuse with the glass surface. This creates a strong bond with the glass thus called a hard coat.
  • Low- e coatings which are solar controlled and form a soft coat. This is made using Magnetron Sputtering Vapor deposition (MSVD) process. This is used off line on pre-cut glass in a chamber with vacuum at room temperature. This needs too be sealed in on insulated glass laminated unit. It has lower emissivity and higher solar control performance. This has highest solar control benefit.

Related Post: Does Triple Glazing Help in Thermal Insulation?

Which one is best for your climate?

In cold climates hard coat is good. As it allows some infrared to pass through. Keeping your house warmer. It also allows your inner warmth to stay in.


If you are in a hot to cold climate soft coat is better as it gives UV protection and better U-Value. It also reflects warm and cool air back into your room instead of letting it out.

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