Old windows are energy vampires. Not in a dramatic way, just the slow bleed of conditioned air escaping through gaps, seals that gave up years ago, and single glazing that’s about as insulating as a sheet of paper.
Melbourne’s energy costs aren’t getting any cheaper. When your ducted aircon is working overtime just to maintain a comfortable temperature because half the cool air is leaking out around window frames, those bills add up fast. It’s like trying to fill a bucket with holes in it.
Aluminium windows with proper sealing make a genuine difference. The aircon doesn’t need to run as long or work as hard to keep the house at the temperature you actually set on the thermostat. Instead of cycling on every twenty minutes, it might only kick in every hour. That’s real money saved.
Double glazing takes it further. Melbourne summers can hit 40 degrees, and that heat just radiates straight through single-pane glass. With double glazing, the aircon isn’t fighting the sun as much. Same with winter heating – the warmth stays where it should instead of disappearing through the windows.
The thermal performance ratings on modern windows aren’t just marketing nonsense either. They actually translate to less strain on your HVAC systems. Better sealing and insulation means the system cycles less frequently, particularly during those brutal January weeks when ducted aircon would normally be running constantly.
Building codes now require better thermal performance anyway, so if you’re replacing windows you’re getting efficiency improvements whether you specifically wanted them or not. The old “she’ll be right” approach to window sealing just doesn’t cut it anymore.
For example, Melbourne air conditioning installers often see firsthand the benefits of well-sealed, upgraded windows firsthand — existing ducted systems no longer need to work as hard to maintain comfortable temperatures once air leaks are eliminated.
It’s one of those home improvements that actually could help towards paying for itself over time, rather than just looking good.
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