Does Wall Insulation Really Help Cut Your Energy Bills?

Many Kiwi households want to know if wall insulation really does help cut your energy bills. The short answer is yes. Insulation slows down heat loss, which means you use less energy to stay warm in winter and cooler in summer. Let’s look at how it works and why it can make such a big difference. 

Why heat loss increases your power bill 

When you heat your home, you pay for every unit of energy it takes to warm the air inside. If that heat escapes quickly, your heater must keep running to replace it. The result is higher energy use and higher costs. 

Research from BRANZ shows that uninsulated walls lose between 18 and 25 percent of a home’s heat. That makes them the second highest source of heat loss after the roof. The harder your heating system must work, the more money you spend keeping your home at a comfortable temperature. Good wall insulation helps cut your energy bills by reducing this constant heat loss. 

How insulation keeps heat where you want it 

Heat naturally moves from warmer areas to cooler ones. In a home without proper insulation, it passes easily through plasterboard, timber framing, and even tiny gaps in the wall. 

Insulation acts as a thermal barrier that slows this process. In winter, it helps keep warmth in. In summer, it keeps hot air out. The denser the insulation, the harder it is for heat to move through it. 

When your home has insulated walls, the heat you generate stays inside for longer. That means your heater or heat pump does not need to run as often or at high settings. The result is lower energy use and a warmer, more comfortable home. 

What homeowners have experienced 

Our customers often share how much of a difference wall insulation has made for them. 

David and Denise live in a 100-year-old home that was cold and damp. When they moved in, the only heat source was a broken fireplace. David said, we like a nice warm house for health and wellbeing. Wall insulation was the final step. After installing CosyWall insulation in the external walls, the change was immediate. Their home now stays warm and dry. 

Paul lived in his home for 11 years and it always felt cold. After installing CosyWall Insulation, his home now holds the warmth for longer and does not need as much heating. Paul says he would definitely recommend CosyWall to anyone living in a cold house. 

Ruth had been in her home for more than 40 years before deciding to insulate the walls. She discovered CosyWall at the Home and Garden Show and felt it was the right choice. Since then, her health has improved, her electric blankets are packed away, and the house feels warmer and drier every day. 

Jean had her whole home insulated, including the walls, while she was repainting. She noticed straight away that she ran her heat pump less often and that warmth from the sun stayed inside longer. The real surprise came with her power bill. Last July she paid $804. This year, after full insulation, her bill was just $332. “Job done I’d say!” she said. 

Stories like these show the real savings and comfort that proper wall insulation brings. 

Make the move towards lower bills 

Wall insulation really does help cut your energy bills. It keeps heat where you want it, reduces the work for your heater, and creates a healthier, drier home. 

If your home is hard to heat or your power bills keep climbing, it might be time to insulate your walls. Talk to us at CosyWall about how our insulation system can transform your home and make it more comfortable all year round.