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Why Windows Are a Major Source of Energy Inefficiency
When homeowners look to improve the energy efficiency of their home they often invest in roof insulation, draught-proofing, or energy-efficient appliances. But one major factor that is often overlooked are your home’s windows.
If windows are single glazed they can be responsible for a disproportionate share of your home's energy loss as up to 40% of heating energy escapes through single-glazed windows in winter, and in summer, solar heat gain through glass forces air conditioners to work significantly harder.
No amount of wall insulation or ceiling batts will fully compensate for single-glazed windows. Until you upgrade your glass to double glazing your home will continue to lose heat in winter and gain it in summer and your energy bills will reflect that.
How Double Glazing Improves Energy Efficiency
Double glazing works by placing an insulating barrier between the inside of your home and the outside temperature. Two panes of glass are separated by an argon gas-filled gap that significantly slows the transfer of heat in both directions.
Our most popular glass unit, LightBridge/Optitherm, takes this further with a Low-E (Low-Emissivity) coating, a microscopically thin metallic layer applied to the glass that reflects radiant heat back into the room in winter and blocks solar heat from entering in summer. Combined with the argon gap, this delivers thermal performance comparable to triple glazing, reducing heat loss through your windows by up to 75%.
For Melbourne homeowners looking for the ultimate in energy performance, our Vacuum Insulated Glass (VIG) units reduce heat loss by up to 93%, outperforming triple glazing in a unit just 8.3mm thick.
The Energy Efficiency Benefits Our Clients Experience
Melbourne homeowners who retrofit double glaze their existing windows consistently report meaningful, measurable improvements:
Double glazing keeps the indoor temperature stable by dramatically reducing heat loss through the glass, meaning your home retains warmth far more effectively on cold Melbourne nights.
The Low-E coating in our LightBridge/Optitherm units blocks solar heat gain, reducing the amount of heat entering your home through the glass and lowering the workload on your air conditioner.
With heat loss reduced by up to 75%, your heating and cooling systems run less frequently and for shorter periods. Many of our clients notice a meaningful reduction in their energy bills from their very first season after installation.
A home with double glazed windows requires less artificial climate control. Many clients find they reach for the heater or air conditioner far less often, particularly during Melbourne's unpredictable seasons.a home with double glazed windows requires less artificial climate control.
Many clients find they reach for the heater or air conditioner far less often, particularly during Melbourne's unpredictable seasons.
One of the most commonly reported improvements is the elimination of cold spots near windows. Double glazing removes the chill that radiates from single-glazed glass, making every room in the home more comfortable.
Less energy used on heating and cooling means lower household emissions, making retrofit double glazing one of the most accessible and impactful sustainability upgrades available to Melbourne homeowners.
Upgrade Window Energy Efficiency With Minimal Disruption
For Melbourne homeowners with original timber windows such as those commonly found in Victorian terraces, Edwardian homes, Federation bungalows, or California bungalows, there's an important consideration that often gets overlooked. Full window replacement isn't necessary to achieve excellent energy efficiency.
RetroFit Double Glaze specialises in replacing only the glass within your existing timber window frames, delivering the full thermal and energy benefits of double glazing while preserving the original character of your home. There's no demolition, no new frames, and no loss of the craftsmanship and original aesthetic of your home.
For heritage and period properties where altering original frames is restricted or simply undesirable, retrofit double glazing is often the only path to meaningful energy efficiency improvement.
Join Over 2,000 Melbourne Homeowners Who have Upgraded to Double Glazed Windows
RetroFit Double Glaze has been helping Melbourne homeowners improve the energy efficiency of their homes for over 14 years. Our installations are backed by a lifetime workmanship warranty and a 10-year IGU warranty, and our experienced local team understands Melbourne's climate and diverse housing stock inside and out.
Warmer winters, cooler summers, lower bills, and a more comfortable home, this is what over 2,000 Melbourne homeowners have experienced.
Book a free, no-obligation measure and quote to find out what retrofit double glazing could do for yours. Or check our double glazing cost calculator to get an approximate cost to double glaze your windows.
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