Preparing for Winter: Insulating Your Home with the Right Window Furnishings

Most “cold house” complaints are window complaints in disguise. Australian guidance regularly points to windows as a major heat-loss pathway, with around 40% of heating energy potentially lost through windows in winter. 

Replacing glazing can be expensive. Window furnishings are often the fastest way to make a room feel less drafty, less variable and cheaper to heat.

Start with the physics, not the product
Heat loss through windows is driven by:

• air leakage and convection (drafts and circulating cold air near glass)
• conduction (cold glass pulling heat out of the room)
• radiant loss (your body “feels” the cold surface)

The best window furnishings reduce air movement near the glass and trap still air. That’s why snug fit and pelmets matter. YourHome spells this out: snugly fitted blinds/curtains with pelmets trap a layer of still air and reduce convective heat transfer. 

What works best, in practice

1. Thermal / blockout-lined curtains with a sealed top
   Energy.gov.au recommends close-fitting lined curtains or blinds and pelmets, with curtains reaching the floor and wrapping to the wall.
   This is usually the highest “comfort per dollar” change in older Melbourne homes with big glass and minimal window seals.
2. Honeycomb (cellular) blinds
   Honeycomb designs trap air in cells, which improves insulation. This is a common building-performance approach because trapped air is a useful insulator layer. 
3. Plantation shutters
   Shutters can improve comfort by creating an additional barrier at the window and reducing drafts when closed. They’re also practical for controlling privacy and light without fabric.
4. Layering
   Layering (blind + curtain, or shutter + curtain) works because multiple layers reduce heat flow and limit airflow. YourHome explicitly notes that heavy fabrics and multiple layers increase insulation when air movement around the curtain is reduced. 

Room-by-room winter picks (Melbourne reality)

• Bedrooms: blockout roller blind + curtain (or double curtains). Sleep improves when light and temperature swings reduce.
• Living areas: sheers for daytime comfort + blockout/thermal layer for evenings.
• Kitchens: moisture and mess matter; usually a blind (roller or venetian) plus good ventilation.
• Bathrooms: focus on moisture-resistant materials and privacy; shutters or suitable blinds.

Pelmets: the detail that changes results
A pelmet reduces air movement at the top edge. Without it, warm air can circulate behind the curtain and drop along the cold glass, creating a continuous “cold fall” next to the window. YourHome and energy.gov.au both recommend pelmets for improving performance. 

Winter also changes condensation risk
Condensation is a behaviour + building + climate mix. The NCC condensation handbook describes condensation as the result of complex interactions between environment, construction and occupant behaviour.
Heavy, sealed-up rooms can hold more moisture if ventilation is poor. A winter setup that works well is:

• open window furnishings during sunny parts of the day when possible
• ventilate bathrooms and kitchens properly
• close coverings at dusk for insulation

Disclaimer: Please note, information contained in this page is general information only. Installation must follow manufacturer instructions and comply with Australian product safety requirements.