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Energy efficiency

What do we mean when we talk about energy efficiency?

Energy efficiency is about reducing energy usage without compromise. 

This means creating very low energy buildings, which are better performing and more comfortable than their neighbours.

You could be zero energy if you didn’t have any modern appliances. Apart from burning a few trees, the cave man was pretty low energy… You could also approach energy reduction without considering how much power you use, but offsetting it by investing in renewables. 

Both of these solutions would reduce energy consumption… but at what cost?

The knowledge and technology is available to give you a high performance building which uses very little energy. Traditional New Zealand building methods cannot achieve low energy and comfort at the same time. By making even the smallest of changes to the traditional method of building, a huge difference to the level of comfort and reduction in energy usage can be achieved. Click on the “Comfort Equation” to learn more.

What does that mean for you?

Invest in your future

Energy efficient building ultimately gives you the triple bottom line:

It’s better for you
It’s better for your cash flow
It’s better for the environment


Health and wellbeing

Living in a healthier and more comfortable environment is priceless if you plan to live a long, healthy and happy life with your family... this is a no brainer. 


Financially smart

Increase the value of your home, instead of budgeting for continual heating/cooling expenses. This capital expenditure adds value to your investment and also makes it more attractive in the resale market, rather than creating regular living expenses you can pay off your mortgage rather than paying the power bill.


Promoting a healthy planet

Buildings generally account for around 40% of all energy consumption. By tackling the energy use of buildings we can have the biggest single effect on reducing energy usage and tackling C02 emissions.

How do we make it happen?

We combine Passive House principles, with a detailed knowledge and experience in New Zealand construction methods, and ways of life. A home designed in New Zealand is very different to a home designed in Europe. We have different expectations, a different climate and a different way of life. None of this needs to change, to strive for a much higher level of comfort and energy efficiency. There is nothing to stop you opening your windows or from having a fire. Your dreams and way of living does not have to change, but your standard of life will improve!

Added Value with Team Green Architects

Cost benefit analysis

When you design a home with Team Green Architects you will get a specific cost benefit analysis of all aspects of the design which will influence your overall comfort and energy usage. This report links the detailed cost estimate from a registered Quantity Surveyor, to your specific energy model using PHPP (Passive House Planning Package). Your report and this detailed energy model (Included as standard within the TGA Developed Design stage), gives you a unique breakdown of the options you have, and the relative cost associated compared to the benefit you will receive. 

Your cost benefit analysis looks at: 

  • Cost
  • Energy Impact
  • Comfort
  • Architectural/aesthetic preference
  • Healthier outcome

1 - Passive House

SHD less than 15 kWh/m2a

  • European timber triple glazed windows
  • Best practice insulation and Thermal Bridge free design
  • Airtightness of 0.5 air changes per hour at 50 pascals pressure. (Note: PH requirement is 0.6 minimum)

2 - TGA Premium

SHD of 25 kWh/m2a

  • European timber triple glazed windows
  • Insulated well above NZB Code, minimised Thermal Bridges
  • Airtightness of 1.5 air changes per hour at 50 pascals pressure. (Note: this is a minimum requirement in a lot of countries)

3 - TGA Minimum

SHD of 35 kWh/m2a

  • Double glazed, Thermally broken  aluminium windows
  • Insulated well above NZB Code, minimised Thermal Bridges
  • Airtightness of 1.5 air changes per hour at 50 pascals pressure. (Note: this is a minimum requirement in many countries)

4 - NZBC Building Code Minimum

(built after 2007): SHD of 140kWh/m2a

  • Double glazed aluminium windows
  • Insulated to current code minimum for South Island, with lots of Thermal Bridges
  • Airtightness of 4 air changes per hour at 50 pascals pressure

5 - Typ NZ

Typical NZ building in Queenstown built between 1978 and 2007 with a SHD of 285kWh/m2a 

  • Single glazed aluminium windows
  • Poorly insulated thermal envelope
  • No real Airtightness - Air leakage

Low energy heating, ventilation, domestic hot water, and solar power design

In addition to this report, Team Green Architects will design an integrated heating and ventilation solution to suit your specific house and preferences. We can also advise on all low energy options available on the market. Including the latest heat pump hot water systems, integrated heat exchange ventilation systems, and solar options.