How do double-glazed windows work and are they right for your home?

How do double-glazed windows work?

The principle behind double glazing is to improve thermal insulation. The two layers of glass create a thermal barrier that reduces the transfer of heat between the interior and exterior of the house. The gas that fills the space between the two layers of glass is chosen for its low thermal conductivity, with inert gases such as argon proving to be the most energy efficient.

Are triple-glazed windows any better?

Triple glazing is the use of three panes of glass rather than two for even greater energy efficiency and comfort but the cost is much higher. Triple glazing is thicker and heavier than double glazing, which means the window frames must be able to bear the extra weight. While triple glazing is widely used in Northern Europe, double glazing is the typical choice in Australia. Since 1 May 2024, all new builds in Victoria have been required to meet new standards, including a minimum seven-star energy rating, improved accessibility features, and double glazing for all areas except designated wet areas, such as bathrooms and laundries.

Benefits of double glazing your windows

Energy efficiency 

Double-glazed windows significantly enhance energy efficiency in the home by providing superior insulation compared to single-glazed windows. In winter, double glazing helps retain indoor heat, reducing the need for constant heating and thereby lowering energy consumption. Conversely, in summer, double-glazed windows help keep the interior cooler by blocking outside heat, reducing the reliance on air conditioning. This dual capability ensures that homes remain at a more stable and comfortable temperature year-round, leading to significant savings on energy bills. The improved insulation also means that less energy is wasted, making double glazing an environmentally friendly choice that contributes to overall home energy efficiency.

Noise reduction  

Double-glazed windows significantly help with noise reduction by creating an effective sound barrier. The gap between the panes disrupts the path of the sound waves so they are absorbed and reflected. This reduces the level of noise that reaches the interior spaces like your bedrooms, living rooms, and home office, where a quiet environment is essential for rest, relaxation, concentration, and productivity.

Condensation reduction  

Excessive window condensation is common in winter. It occurs when warm, moist air inside the home comes into contact with the cold pane of glass, causing the moisture to condense into water droplets. Over time, this condensation has the potential to damage the windowsills. Double glazing reduces the likelihood of condensation occuring because the interior pane of glass stays closer to the temperature inside the home. 
 
Reduced condensation also helps prevent the growth of mould, which can be detrimental to both health and the integrity of window frames and surrounding walls. Consequently, double glazing contributes to a more comfortable living environment.

Additional security measure 

The added strength of double-glazed windows makes it more difficult for burglars to gain entry. Breaking through two panes of glass requires more time, effort, and creates more noise, thereby helping to act as a deterrent.

Many double-glazed windows come with advanced locking mechanisms that are more secure than older systems. These locks often feature multi-point locking systems that secure the window at various points around the frame, further enhancing their resistance to forced entry.

The presence of double glazing can also support the overall structural integrity of the window frame, making it less likely to be pried open or tampered with. In some designs, the glass panes are laminated or toughened, providing an extra level of security by making the glass even harder to break.

Potential increase in property value 

Installing double-glazed windows may increase the value of your property. They are a desirable feature for potential buyers due to their energy-saving and comfort-enhancing benefits.

Considerations for double glazing your windows

Upfront cost  

Investing in double-glazed windows can be costly upfront, but the long-term benefits make it worthwhile. As previously outlined, double glazing improves energy efficiency and prevents condensation, contributing to savings and benefits over time, making double glazing a cost-effective choice for homeowners.

Installation process 

When considering installation, several factors must be taken into account to ensure you get the best results for your home. First, assess the type and quality of the double-glazed windows you need; look for features like energy efficiency ratings, noise-reduction capabilities, and security enhancements. It's essential to measure your windows accurately and choose a style that complements your home's architecture. A professional tradie can assist with this part of the process. 
 
Consider the type of gas used between the panes, such as argon, which offers better insulation as it is denser than dehydrated air which transfers more heat. The quality of the window frame is also crucial: materials like uPVC, wood, or aluminium each have their benefits and drawbacks. Additionally, hiring a qualified and experienced installer is key to ensuring a professional job and long-lasting performance. Lastly, be mindful of any local building regulations or planning permissions that may apply to your property before proceeding with the installation.

Maintenance  

Double-glazed windows require minimal maintenance. Check for condensation between the panes, which can indicate a broken seal that needs professional attention. If the seal between the panes is compromised, it can lead to a reduction in efficiency.