Dehumidifiers & Purifiers

Creating a healthier, drier Kiwi Home with our Dehumidifier and Air Purifier range

New Zealand’s climate can make it hard to keep homes healthy. With lots of rain, cold winters, and many houses without good insulation or heating, damp air is a common problem. Managing moisture isn’t just about feeling comfortable - it helps protect your health and your home.

A 2019 BRANZ study shows that nearly half of New Zealand homes have dampness and mould issues. This makes dehumidifiers and air purifiers important for many Kiwi households. If you’re dealing with wet windows, musty smells, allergies, respiratory problems, or visible mould, the right appliance can help keep your home healthier year-round.

At Harvey Norman, you’ll find a wide range of dehumidifiers, air purifiers, and combination models from leading brands, including Mitsubishi Electric, Goldair, Breville and Dyson.

Finding the right dehumidifier

When browsing, you’ll see two main types of dehumidifiers. Choosing the right one for your specific part of NZ is key:

• Refrigerant (compressor) models: The most common type available. Best suited to warmer, humid conditions, well‑insulated homes, and coastal areas such as much of the North Island. They are more energy‑efficient at higher temperatures (above 15°C) and tend to produce slightly cooler air. Choose this option to manage excess moisture in heated living areas, such as living rooms, kitchens, and bedrooms.
• Desiccant models: Designed to perform better in cooler conditions, particularly when room temperatures drop below 12 °C. They are generally quieter, lighter, and easier to move between rooms. Desiccant models produce warmer, drier air, which helps reduce condensation on cold windows. Choose this option to tackle damp in cold or unheated areas, such as garages, sunrooms, workshops, or poorly insulated homes.

Should I buy a desiccant or refrigerant dehumidifier in NZ?

It depends on your home’s temperature and the weather conditions. Refrigerant dehumidifiers are amazing for warmer areas (like the Northern Island weather) or summer humidity. Desiccant dehumidifiers perform better at removing moisture from the air in cold New Zealand homes where temperatures drop below 12°C.

How do I choose the right size dehumidifier for my home?

Choose a dehumidifier based on room size, humidity levels and how damp your house is. A compact 10-12L unit is perfect for small bedrooms or a home office. While large, open-plan living rooms or damp homes may need 20L or more models. Kiwi homes with poor insulation or visible condensation often require a higher-capacity unit.

Can I use a dehumidifier in winter in NZ?

Yes – and winter is when you’ll need it the most. Dehumidifiers help control condensation, reduce mould growth, and make rooms easier to heat. Just remember that desiccant models perform best below 12°C, while refrigerant models work well above 15°C.

How an Air Purifier Helps Your Home

• Allergy and asthma relief: Can help ease symptoms for people with allergies or asthma and are especially helpful in homes with pets or babies. True HEPA purifiers (H13/H14) offer the highest level of filtration but can be more expensive. For a more affordable option, look for HEPA‑type or HEPA‑like models.
• Smoke & odour removal: If you have a fireplace or live near a busy road, a carbon filter is essential. It doesn’t just trap dust and pollen; it actually absorbs gas pollutants and those stubborn cooking smells.
• The right fit (CADR): always check the CADR (clean air delivery rate). This tells you how much air the unit can clean. A higher CADR is ideal for larger rooms or heavily polluted environments. Look for a unit with a low noise rating (under 30dB) for bedrooms so you can sleep soundly while it works.

What does HEPA mean in an air purifier?

HEPA stands for High-Efficiency Particulate Air. In an air purifier, a HEPA filter is a special filter that cleans the air by removing tiny particles. It can catch dust, pollen, pet hair, smoke, and some germs. They are ideal for improving indoor air quality for allergy and asthma sufferers. Popular brands using a HEPA filtration system include Dyson, Breville and Shark.

Tip: Look for models with a removable pre-filter to trap larger dust and hair. Regular vacuuming and cleaning it will help extend the life of the more expensive HEPA filter.

What’s the difference between a dehumidifier and an air purifier?

A dehumidifier removes moisture from the air, significantly reducing dampness and mould growth. An air purifier cleans the air by removing pollutants and allergens. If moisture is your issue, choose a dehumidifier. If air quality or allergies are your concern, choose an air purifier, or consider a combination model.

Where is the best place to put an air purifier?

Place your air purifier in an open area, at least 30cm away from walls or furniture. For the best results, keep it near the head of your bed or close to sources of odour and dust, such as the kitchen, pet beds, or the litter box.