Single Glazed Windows vs Double Glazed Windows: What’s The Difference?

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Windows are an essential aspect of any home. They can play a large part in the efficiency of your home and they can also be a source of unnecessary heat gain and loss. The cost of energy seems to always be rising and with around 40% of heat energy being lost through your windows, it only makes sense to want to improve your windows’ efficiency and reduce energy costs.

A great way to do this is to change your single glazed windows to double glazed windows. There are some single glazing and double glazing pros and cons but let us cover the basics for you before we get into that.

Double glazed vs single glazed

Double glazed windows are closed units made using two pieces of glass that are separated by an air gap. The gap is sealed and acts as a break between the inside and outside pieces of glass. The air gap is filled with gas which increases the insulation between the glass pieces. 

A single glazed window is made using only one piece of glass, meaning the only thing between your home and the outside elements is a pane of glass. Single glazed windows are considered to be less efficient and provide very little insulation. 

Let’s have a closer look at some of the important differences:


In the short term single glazed windows are cheaper, but they lack the thermal insulation requirements to protect your home from the heat or the cold. This usually means your heating and cooling costs are not going to be easy on the pocket. 

Double glazed windows can be expensive to install, but they offer more long term benefits like keeping your heating bill down by keeping the warm air inside your home during those colder months.


As mentioned above double glazed windows help to keep the warm air inside your home and can reduce heat loss by almost 25%. They work to better insulate your home, whereas single glazed windows lack the capacity to do so.

It is important to note that double glazing can be so efficient at insulating your home, during the warmer months it can be hard to maintain a cooler temperature. At Windows Republic, we offer a great alternative with our Low-E glass that filters radiation from the sun to reduce heat and keep your house cool in summer. 


Because double glazed windows work to better maintain your home’s temperature, not only are you not paying through the roof for heating, but you’re saving energy too. Keeping your bank account happy and lessening your homes negative impact on the environment. A benefit single glazed windows don’t offer.


You might live on the quietest street, but whether it’s the neighbour’s dog or the local bus, a street will never lack in noise. These everyday noises can be annoying to live with, but double glazed windows can be the perfect noise barrier by providing acoustic insulation helped by the layers of glass that make up these windows. 

It’s not guaranteed soundproofing, but it will help reduce noise against single glazed windows that don’t offer much in this department. 


Conventional single glazed windows lack the means to prevent condensation from occurring. When there’s a strong temperature contrast such as moist air meeting cooler objections, condensation and even mould can build up. 

The insulation capacity that double glazed windows have prevents water from forming on the glass, minimising the chance of any build-up. Because of this, you won’t have to deal with constantly needing to replace window frames or keeping mould at bay. 

Windows Republic also offers uPVC double glazed windows, that require no painting or surface maintenance other than the occasional drop of oil and a light clean a few times a year.

Double glazed takes the lead

The difference between single glazed and double glazed windows are clear, the biggest one being the numerous advantages double glazed windows can offer! 

For more information on double glazed window options Windows Republic is here to help, so please contact us today for a free measure and quote.

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