If you’re trying to fix a cold house in Melbourne, it’s easy to assume double-glazed windows are the answer. Picture this: You’ve just spent thousands on double-glazed windows. The old rattling windows are gone. The installation is finished. The house looks better. Everyone says you’ll notice the difference immediately. Then winter arrives…
It’s 6am. You’re standing in the kitchen with a coffee in one hand and the heater running in the background. And the house still feels cold.
Exactly the kind of cold you were trying to get rid of.
It’s frustrating when you think you’ve taken the right steps to fix a cold house, only to realise the discomfort hasn’t actually changed.
That’s the part nobody talks about. Because from the outside, everything appears to have worked. The windows are high quality. They’re installed correctly. You’ve spent good money solving the problem.
Except the problem wasn’t the windows.
Or at least, not all of it. If you’re trying to fix a cold house, windows alone are rarely the full answer.
Why So Many Homeowners End Up Disappointed
If you install double glazing without addressing the surrounding building envelope, you may only improve thermal performance by around 3%-4%.
That’s it. The house will probably be quieter. The reduction in outside noise can be significant. But that persistent Melbourne winter cold? The one that creeps through the house no matter how long the heater runs?
Much of it can still be there.
Because heat doesn’t just escape through windows — and that’s where many people trying to fix a cold house get misled.
It escapes through walls, ceilings, floors, gaps, junctions, and dozens of other places most homeowners never think about.
Which is why, before you choose a window system, compare quotes, or spend a dollar on double glazing, it’s worth understanding what double glazing actually does…
And what it doesn’t.
What It Really Takes to Fix a Cold House
This surprises a lot of people.
You can get cheaper double glazing that performs reasonably well. You can also spend significantly more on windows that still only deliver average thermal performance. The price doesn’t tell you what you’re getting.
Here’s what actually affects how a window performs:
The frame material
The type of glass
Whether it uses argon gas or low-energy glazing
The quality of the seals
How the window actually closes
A sliding sash behaves differently to a tilt-and-turn. An aluminium frame behaves very differently to a composite one. So before choosing a product, the better question is: what problem are you actually trying to solve?
Noise reduction, draught control, heat retention, condensation… these aren’t the same problem, and they don’t always point to the same solution.
The Frame Itself Is Part Of The Problem
Standard aluminium frames conduct temperature very easily. On a cold Melbourne morning, the frame itself can actually feel colder than the glass. That cold transfers straight through into the home.
It’s called thermal bridging, and it works in both directions. Cold comes in, warmth goes out, and the frame is the path it travels through.
Composite and thermally broken frames are designed to interrupt that transfer. In a thermally broken window, the aluminium is separated by a non-conductive material (usually timber) so the cold surface outside can’t conduct directly through to the inside.
Aluminium isn’t necessarily the wrong choice (depending on the budget and what’s being prioritised). But if thermal performance matters, the frame is part of that equation whether it gets factored in or not.
So What Actually Moves The Needle On Warmth
The windows are one part of it. The part most people skip is what happens around them.
Before the plaster goes on, there’s typically a 10–15mm gap sitting between the window frame and the surrounding structure. Most people never know it’s there. But air moves through it freely (in and out), regardless of how good the window is itself.
Expanding foam fills that gap, and tape handles the external side for weather and water tightness. Neither is expensive, neither is visible once the work is done – but without them, a significant amount of what the window was supposed to achieve just quietly doesn’t happen.
One other thing worth knowing: insulation doesn’t work in those gaps. Compress it into a tight space, and it loses most of its effectiveness. The gaps around window frames are simply too small… which is exactly why foam exists for that purpose.
Install the windows without this surrounding work, and you’ve mostly bought a quieter house. Do it together, and you’re addressing the actual problem: temperature.
Before You Spend a Dollar on Double Glazing
Every year, people spend thousands upgrading glass, frames, and window systems expecting their home to finally feel warmer in winter, only to realise they were trying to solve a problem bigger than the windows themselves.
The frustrating part is that once the money has been spent, there’s no easy way to get it back. The windows stay. The invoice gets paid. And only then do many homeowners discover there were other areas of the home responsible for a significant portion of the heat loss all along.
That’s why the smartest thing you can do isn’t choose a window system first. It’s to identify where your home is actually losing comfort.
If you truly want to fix a cold house, you need to address the entire building envelope, not just the glass.
Before you compare products. Before you request quotes. And before you commit thousands of dollars to a solution.
To help with that, I’ve put together a short self-assessment called:
It walks you through the same warning signs we look for when assessing a home, helping you identify whether your biggest comfort problems are really coming from the windows, or whether something else is quietly working against you.
Most people discover at least one issue they hadn’t considered. And finding that out before you spend the money is a lot better than finding out afterwards.
