Double glazed windows
Double glazing is used for using two panes of window glass instead of one. Photo: GoGreen Glazing.

Double glazed windows aren’t just a luxury. They’re a pragmatic, forward-thinking option for landlords who want to increase their investment property’s value and energy savings.

Guest post by Nathan Bishop, Owner at GoGreen Glazing.

Double glazing is highly energy-efficient and allows the landlord to immediately increase weekly rent and offer top-notch quality to potential or existing tenants.

Double glazing means using two panes of glass for a window instead of one. Often inert xenon, krypton or argon gas is trapped between the two airtight panes to increase effectiveness.

Double glazing significantly reduces energy transfer between the outside and inside of the home, which means fewer leaks, drafts and less bulky heating and cooling systems. Providing almost twice the insulation of a single glazed window, double glazed windows can cut the costs of heating or cooling a home in half.

Low Emissivity or Low-E glass significantly increases heat retention in terms of glass type, while warm space bars at the window’s edge help the system work at optimal efficiency. The spacer is either a polymer or metal strip used to separate the two panes and includes a drying agent that gets rid of any wetness trapped inside. Picking the correct spacer with an effective drying agent ensures that the double glazed unit will be adequately sealed and of high quality. Compression shoot bolt locks are the most common method for locking double glazed windows, but many other locking options are also easy to install and effective.

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In addition to cutting heat loss in half, double glazing reduces external noise and reduces condensation that crops up in cold weather. This means mould has a much harder time forming than on single-pane windows.

With single pane windows, cold air from outside forms condensation when it meets warm air from inside, and the window fogs up and eventually builds up mould, not to mention ice in winter that drives up heating costs. Double glazing takes care of this condensation and mould problem, resulting in significant savings on cleaning costs and heating bills.

Another benefit of double glazing is that it is very much eco-friendly. Because less heating is required in a home with double glazed windows, less fuel is consumed, reducing the house’s carbon footprint. Therefore, double glazing is a step to reducing greenhouse gas emissions – and it saves you money on heating. It’s a win-win.

Double glazing also allows for enhanced security as the interlocking system bolsters beading and hinges on the window’s interior. This prevents the window from being pried open from the outside. Double glazed windows are also more challenging to smash than single glazed windows. Consider going for laminated or toughened glass for even stronger double glazed windows.

Another big plus to double glazing is noise reduction. Sound insulation is significantly increased by choosing double glazing over single. Like the human voice, which is medium to high frequency, noise is considerably lessened from outside to inside. You can install double glazing to create a bigger gap between the panes to even further reduce noise pollution. However, it is recommended that this space is not increased too much to avoid a resulting loss of heat retention.

Most new houses are being built with double glazed windows. An equal amount of sunlight will shine through double glazed windows as through single glazed windows, but double glazing will retain much more heat without harmful ultraviolet rays. Ultraviolet rays are cut down by as much as 75 per cent when double glazing is installed, which can save the longevity of carpets, wood, fabric and artwork in the home and one’s health.

It’s also worth considering the installation of double glazed windows in older homes as part of repairs or retrofitting existing windows to increase the value of the property and offer tenant’s the best technology in the house.

In sum, double glazing is the best forward-thinking, pragmatic and cost-effective option when considering windows in the home. It provides years of increased value to landlords and improves a home immeasurably.

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Nathan Bishop
Nathan Bishop

Nathan Bishop is the Owner of GoGreen Glazing, a Geelong-based business in operation for more than six years. The company services Moorabool, Geelong, the Bellarine Peninsula and Surfcoast regions. GoGreen Glazing provides efficient, reliable, and thermally-effective glazing solutions. The company is a member of the Australian Glass & Window Association. Their services include double glazed windows, window and door replacement, security screens, doors and grilles, commercial Energlaze, and glass repair and replacement.


  1. I like that you mentioned that double glazing is energy efficient. That is a huge plus. I am always looking for ways to save on energy bills, and this could be a great option. I will have to look into it.

  2. My sister has a vacation house and thinks that double glazed windows will keep it safer while she is away. I am glad to learn that double glazing means using two panes of glass for a window instead of one. It is good to know that this provides almost twice the insulation of a single glazed window. It would be nice to have a well ventilated and secure house thanks to these windows.

  3. Double glazed windows might be expensive on the get go, but are definitely worth the investment in the long run. One will save energy and money. Interesting read! Keep up the good work!

  4. Property investors may need to consider tax implications if replacing single glazed windows with double glazed ones. Depending on the circumstances, it would either be a repair or improvement. Repairs and maintenance are tax deductible, improvements aren’t. Check with a tax accountant who has experience with advising property investors.