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Single Glazed vs Double Glazed Windows: What's Right for You?

Author:Md. Taufiq Khan Click: Time:2020-10-22 09:20:18

An energy-efficient home is a comfortable home, as it is one that is easier to heat or cool. Making sure your home is energy efficient will not only improve comfort but will also save money on utilities. Insulation, location, and the materials used in home construction will all help to increase energy efficiency. The glass you use in your home is also critical when it comes to energy efficiency. If you're deciding between single glazed and double glazed windows, it's important to know the differences, and which option is better for your home.

Single Glazed vs Double Glazed: The Difference

A single glazed window is constructed using a single pane of glass. This means that the only thing separating your home from the outside environment is the pane of glass. Typical window glass ranges from 3mm to 10mm, which doesn't provide adequate insulation. A single glazed window can be up to 20 times less efficient than an insulated wall when it comes to energy loss or storage.

Double glazed windows utilize two separate pieces of glass, separated by a vacuum. The vacuum layer acts as an insulative barrier. The glass used can be laminated or UV tinted but is otherwise similar to the glass used in single glazed windows. When double glazing is retrofitted to existing window installation, the thermal efficiency can be improved by up to 80%. Factory-made double glazed windows can be up to 100% more efficient than a single glazed equivalent.

What Benefits Does Double Glazing Provide?

The most obvious benefit to be gained from double glazed windows is the increase in energy efficiency. This means that it will be easier to maintain the temperature inside your home. This is especially beneficial to families with air conditioners, or central climate control systems.

An example would be a home that is using a split type air conditioner/heat pump to warm a living room during winter. Without double glazing, the warmth inside is easily lost. This means that the indoor unit is forced to work harder to maintain a comfortable temperature in the room.

With double glazing, heat loss can be reduced by half in optimal conditions. When combined with insulated curtains covering the windows, the heat loss becomes even less.

What is Thermally Broken Double Glazing?

thermal break in an aluminum double glazed window system is a terrific way to improve energy efficiency by controlling forms of heat transfer. A thermal break is a non-metallic resin or plastic material installed in the metallic window frame that physically separates the interior part of the window from the exterior part.

Heat or thermal heat energy can be transferred through the material in three manners:

  • Conduction, which is simply the process where heat is transferred through materials that touch one another.
  • Convection, which is where gasses or liquids circulate to transfer thermal energy.
  • Radiation, which transfers heat energy at a distance through high-frequency waves such as visible light, ultraviolet light, or microwaves.


Thermally broken window frames are insulated against heat and cold conduction. This is done by separating the outside metal parts from the inside with a material that reduces the amount of heat or cold transferred through the frames thus further reducing the amount of energy spent on heating and cooling throughout the year.

The Bottom Line

Even though the initial cost of double glazed windows or thermally broken double glazed windows is higher than single glazed alternatives, they will pay for themselves with reduced energy costs, over time. This makes them the best choice for new homes and renovations.

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