It is mid-July, and winter has officially settled across New Zealand. From frosty mornings in Waikato to the brisk winds hitting the Hawke's Bay and Palmerston North, Kiwi homes are feeling the chill. As the outdoor temperatures drop, many of us are turning up the heat pumps, lighting the fires, and bracing ourselves for the winter power bills.
But have you ever wondered how much of that expensive heat is actually staying inside your home?
We recently visited a client's home on a crisp morning, and the results were so staggering we had to share them. This isn't a factory test or a corporate graphic—this is a real Kiwi living room, captured on a thermal imaging camera.
A Tale of Two Windows
Take a look at the image below. In the exact same room, at the exact same moment, we have two completely different window setups sitting side by side:
On the Left: A modern, retrofitted double-glazed window.
On the Right: The original, traditional single-glazed timber window.
Even with the naked eye, the difference is night and day. The single-glazed window on the right is completely covered in a thick layer of morning condensation—what we like to call "weeping windows." The double-glazed window next to it is bone dry and crystal clear.
But the real shock comes when we turn on the FLIR thermal imaging camera.
Caught "Purple-Handed"
Thermal cameras show us exactly where heat lives, scaling from warm (yellow, orange, and white) to freezing cold (purple, magenta, and black).
Look at the contrast between the two windows in the thermal shot:
The Double-Glazed Window (Left): It shows up as a warm, radiant orange. The glass is successfully holding the interior room temperature, matching the warmth of the surrounding insulated walls. The heat pump's energy is being trapped inside where it belongs.
The Single-Glazed Window (Right): It glows a deep, icy purple. The glass surface temperature has plummeted right down toward the outdoor temperature (around 7°C).
What this actually means: That single-glazed window is acting like a giant block of ice sitting inside the living room. It is actively sucking the warmth out of the air, forcing the home's heating system to work twice as hard just to keep the room liveable.
Stop Heating the Outdoors This July
Windows and doors can account for massive heat loss in an uninsulated home. When your glass is as cold as a fridge door, it creates uncomfortable draughts, breeds toxic mold, and drains your wallet.
Retrofitted double glazing creates a thermal barrier (complete with an insulating air gap) that keeps the cold out and the comfort in. You don't just feel the difference in the air temperature; you see it on your power bill.
Whether you are trying to keep the damp out of a character villa in Palmerston North, upgrade a family home in the Waikato, or stop the drafts in the Hawke's Bay, the Cozy NZ team is near you and ready to help.
If you’re tired of wiping down crying windows every morning and watching your heating escape through the glass, it's time for a change.
