Understanding Home Heat Loss and The Difference Insulation Makes
Home heat loss is one of the biggest reasons many houses across New Zealand feel cold and are expensive to run during winter. Without the right insulation, a large amount of the warmth you pay for can escape before it ever makes a difference.

Home heat loss is one of the biggest reasons many houses across New Zealand feel cold and are expensive to run during winter. Without the right insulation, a large amount of the warmth you pay for can escape before it ever makes a difference. Knowing where heat goes and how insulation helps is the first step to making your home warmer, drier, and more comfortable.
Where Homes Lose Heat
Research from BRANZ shows just how much heat can escape from an uninsulated home:
- 30 to 35 percent through the roof
- 18 to 25 percent through the walls
- 21 to 31 percent through windows
- 12 to 14 percent through the floor
That adds up to more than 70 percent of your heating being lost. Even if you run your heater all day, warm air won’t stay inside unless your home has good insulation. This means your home takes longer to heat, you need to use more energy, and your power bills rise.
Why Home Heat Loss Matters
When warm air escapes and cold air comes in, your home becomes harder to keep at a comfortable temperature. Heat loss also leads to damp and chilly areas, which can affect your family’s health. Cold, damp homes increase the risk of colds, flu, and respiratory problems, especially during winter.
Reducing home heat loss means you spend less on heating and cooling. It also means you get a healthier, warmer home that is nicer to live in.
The Difference Insulation Makes
Insulation acts like a blanket for your home. It slows down the transfer of heat so that warmth stays inside during winter and heat stays out during summer. This makes your home much more energy efficient.
If your home already has some insulation but still feels cold, it may be thin, patchy, or outdated. Upgrading your insulation can make a big difference to your comfort and power bills.
Know Where Your Home Is Losing Heat
Every home is different. Some houses may need a ceiling top-up, others may have draughty floors or uninsulated walls. The best way to know where your home is losing heat is to have an assessment carried out.
At Insultech, we specialise in retrofitting insulation into existing homes across Waikato. Our team has more than 30 years of experience helping Kiwis reduce home heat loss and improve comfort. We can check your home and recommend the right insulation solution for your needs.
Home heat loss doesn’t have to be a problem. With the right insulation in place, your home can stay warmer, drier, and healthier while also saving you money. Contact Insultech today to book your free assessment and take the first step towards a better performing home.
Wondering what your home needs?
We’ll check for free, anywhere in Hamilton and the Waikato.
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