---
title: Why Airtightness Is Important in Energy Efficient Homes
description: "## Short Answer Airtightness reduces uncontrolled air leakage, helping maintain indoor temperatures, improve energy efficiency, and prevent draughts. ## Overview Most homes allow air to leak through gaps in the building envelope. While this might seem minor, it can significantly…"
url: "https://energyefficienthomes.co.nz/docs/why-airtightness-is-important-in-energy-efficient-homes/"
updated: "2026-04-28"
category: "Performance-and-Building-Science"
---

# Why Airtightness Is Important in Energy Efficient Homes

## Short Answer

Airtightness reduces uncontrolled air leakage, helping maintain indoor temperatures, improve energy efficiency, and prevent draughts.

## Overview

Most homes allow air to leak through gaps in the building envelope. While this might seem minor, it can significantly impact comfort and performance.

## Key Points

- Airtightness reduces heat loss, eliminates draughts, improves temperature consistency, and supports ventilation systems.
- Leaky homes allow heat to escape quickly, cold air to enter unpredictably, and heating systems to work harder.
- Airtightness and ventilation work together. Airtightness controls where air moves, while ventilation ensures fresh air is introduced properly.
- Airtightness is one of the biggest factors in energy performance, comfort, and indoor air quality.

## Common Questions

**Will an airtight home feel stuffy?** No, when paired with proper ventilation.

**Is airtightness standard in NZ?** Not typically at high levels.

## Next Step

If you are planning a new home, our team can help you understand what level of performance is possible and where to focus your budget.