Energy efficiency isn’t just a buzzword in New Zealand—it’s an investment in your future. Whether you’re in Auckland, Wellington, Christchurch, or a rural town, creating an energy-efficient home can lead to lower electricity bills, improved comfort, and a healthier planet. With power costs rising and growing awareness around climate change, more Kiwi homeowners are taking proactive steps to reduce their energy footprint.
This comprehensive guide will take you through everything you need to know—from small DIY changes to large home upgrades—to transform your home into a sustainable, cost-saving sanctuary.
Why energy efficiency matters in NZ
- High electricity prices: NZ has some of the highest power costs in the developed world.
- Climate factors: Many homes lack central heating, making insulation critical.
- Environmental concerns: Lower energy use means a smaller carbon footprint.
- Government incentives: Grants and support programs help you upgrade your home affordably.
Step-by-step guide to energy efficiency improvements
1. Start with an energy audit
Hire a professional or use an online self-assessment tool to identify energy leaks and usage patterns in your home. This helps prioritize what to fix first.
2. Insulate your home properly
- Ceiling insulation: Heat rises, so this is priority #1.
- Underfloor insulation: Keeps homes warmer in winter, especially villas and bungalows.
- Wall insulation: More expensive but offers year-round thermal performance.
- Insulation materials: Choose from fiberglass, wool, polyester, or recycled products.
3. Upgrade windows and doors
- Double glazing: Reduces heat loss by up to 50%.
- Thermal curtains: Block cold air and retain heat.
- Weather stripping: Seal around doors and windows.
- Window film: Reflects UV rays and adds privacy.
4. Plug the leaks
- Use door snakes and under-door seals.
- Seal cracks with gap filler or silicone.
- Install draught stoppers.
Even small gaps around sockets and skirting boards can leak air. Fixing them keeps warm air in and cold air out.
5. Lighting: switch to LED
- Use LED bulbs for all lighting—they use 85% less power.
- Choose smart bulbs that adjust brightness and colour.
- Install motion sensors in bathrooms and garages.
6. Efficient heating and cooling
- Heat pumps: The most efficient heating method for most NZ homes.
- Wood burners: Sustainable when using dry, untreated wood.
- Smart thermostats: Automate temperature control.
- Ceiling fans: Circulate warm air in winter and cool in summer.
7. Water heating
- Insulate your hot water cylinder and pipes.
- Install a heat pump water heater.
- Use low-flow showerheads.
- Turn water temperature down to 55ºC.
Water heating is often the second-largest energy user in NZ homes.
8. Energy-efficient appliances
When shopping for new appliances:
- Look for the Energy Star rating.
- Choose inverter models (e.g., fridges, air conditioners).
- Use cold water cycles on washing machines.
- Turn off at the wall when not in use.
9. Install solar panels
- Grid-tied systems allow you to sell excess energy.
- Battery systems (like Tesla Powerwall) provide backup.
- Government incentives may help offset upfront costs.
- Average savings can be over $1,000 per year on power bills.
10. Smart home tech
- Smart plugs: Automate power to devices.
- Home hubs (Google Nest, Amazon Echo): Central control.
- Timers & sensors: Shut devices off when not needed.
Sustainable outdoor upgrades
1. Native tree planting
Plant native trees for shade, shelter, and cooling. Trees can lower surrounding temperatures and reduce the need for indoor air conditioning.
2. Solar lighting for gardens
Use solar-powered path lights and spotlights. They charge by day and run at night without consuming grid power.
3. Rainwater harvesting
Install a tank to collect roof water for use in gardens, flushing toilets, or even laundry (if filtered).
4. Composting
Use a compost bin or worm farm to reduce landfill waste. Turn organic matter into garden food, reducing the need for chemical fertilizers.
5. Veggie garden
Growing your own herbs and vegetables reduces trips to the store and supports sustainability.
Behavioural changes that cost nothing but save big
- Turn off lights when leaving a room.
- Only run full loads in dishwashers and washing machines.
- Keep fridge and freezer seals tight.
- Use lids on pots to reduce cooking time.
- Dry clothes on a line instead of the dryer.
Government programs and support
EECA (Energy Efficiency and Conservation Authority)
- Offers funding for home insulation and heating upgrades.
- See Warmer Kiwi Homes for eligibility.
Kainga Ora Healthy Homes Standards
- Enforces energy efficiency for rental properties.
- Includes insulation, heating, ventilation, and moisture control.
Regional Council Rebates
- Some local councils offer subsidies for rainwater tanks or compost bins.
Long-term benefits of energy efficiency
- Lower bills: Reduced usage means consistent monthly savings.
- Comfort: Better temperature control throughout the seasons.
- Healthier living: Reduced mould and condensation.
- Increased property value: Buyers are seeking efficient homes.
- Eco-friendly: Reduces your personal carbon footprint.
Checklist: 25 ways to save energy at home in NZ
- Ceiling insulation
- Underfloor insulation
- Wall insulation
- Double glazing
- Thermal curtains
- Seal door gaps
- Weather stripping
- LED lighting
- Smart lighting
- Motion sensors
- Heat pump installation
- Thermostat with timers
- Low-flow showerheads
- Hot water cylinder wrap
- Solar panels
- Solar hot water system
- Rainwater harvesting
- Cold water laundry
- Energy-efficient fridge
- Composting
- Dry clothes naturally
- Line dry instead of tumble drying
- Smart plugs for appliances
- Eco-friendly landscaping
- Grow your own food
Final thoughts
Improving energy efficiency doesn’t require a huge upfront investment. By making smart decisions over time, you can create a comfortable, future-proofed home that saves money and supports the planet. Start small or go big—either way, your effort pays off.
