Confirm the official H1 climate zone for the site before relying on the indicative report. The default follows this project's current climate location.

Comfort and shading

Choose the indoor comfort range, then describe how much sun reaches the windows.

Heat to °C

Cool above °C

Year-round obstruction

Summer eaves, blinds or shutters

Summer shading reduces overheating risk. South-facing glass is left unchanged by the simple preset because it receives little direct summer sun in New Zealand.

Advanced: adjust each direction

Year-round % Summer % N E S W

100% means all available sun reaches the glass; lower percentages mean more shading.

The monthly model calculates energy at 18–24°C by default. It does not claim the percentage of occupied hours within that band; that requires an hourly comfort model.

Estimated running cost

Enter the variable electricity price from a bill and choose how the home is heated. Daily fixed charges are excluded.

Electricity rate (c/kWh)

How is the home heated?

This home will use air conditioning

Advanced: equipment rating and tariff evidence

SCOP/COP describe seasonal efficiency. For example, 3.5 means about 3.5 units of heating or cooling for each unit of electricity.

Heating seasonal efficiency (SCOP)

Cooling efficiency (COP)

Tariff source

Tariff date

Window price and payback

Use the current EUR to NZD exchange rate. Viking freight and NZ landing charges are then added once per container.

EUR to NZD exchange rate

40 ft shipping containers

Owner-confirmed allowances: EUR 3,500 freight plus NZD 2,000 landing charges per container. One house of glazing is approximately one container; refine when the order is packed.

Annual space-conditioning demand

— kWh/m²·yr

Heating — Cooling with passive ventilation —

Openable-window cooling is modelled before active cooling. A no-summer-ventilation sensitivity will appear here. Comfort band: 18–24°C. Percentage of occupied hours within the band is not calculated by this monthly model.

Indicative annual energy — Estimate Awaiting project electricity tariff and system COP. Complete the running-cost choices to compare this build with the indicative code-built house.

Same house, two honest reference points

The homeowner comparison leads with an indicative code-built house. The statutory H1/VM1 basis is shown separately.

This build

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NZ code-built houseIndicative · 5 ACH50 · no MVHR

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H1/VM1 referenceCompliance basis · services held equal

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Reference details

The indicative code-built house uses the same geometry with a code-minimum envelope, assumed 5 ACH50 and no heat recovery.

The H1/VM1 reference holds geometry, airtightness, ventilation, MVHR and services equal; only insulation and glazing change to code minimum.

Extra capital cost — Against the default specification

Annual energy saving — Against the indicative code-built house

Simple payback — Indicative; excludes finance and escalation

Manage Building Levels

Same house, two honest reference points

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