When summer hits in New Zealand, it hits hard.
Most Kiwi homes weren’t built with scorching temperatures in mind – think single glazing, minimal insulation, and windows that seem to invite the heat in.
If you don’t have (or don’t want to pay for) air conditioning, there are still plenty of low-cost tricks to help you stay comfortable.
Here are 15 cheap and effective ways to keep your home cool this summer.
1. Close Curtains Early
Don’t wait until it’s hot to close the curtains – by then, the damage is done.
Shut blinds and curtains before the sun hits that side of the house.
It traps the cool morning air inside and prevents your home from turning into an oven.
If you don’t have thermal or block-out curtains, even hanging a sheet or blanket temporarily can make a big difference.
2. Open Windows Strategically
Get the air moving the smart way.
Open windows on opposite sides of your home to create a cross-breeze, and focus on the shaded side during the day.
In the evening, when the outside air cools down, open everything up to let the heat escape.
3. Use Fans the Smart Way
Fans don’t actually cool the air – they move it.
But you can use that to your advantage:
- Put a bowl of ice or a frozen water bottle in front of a fan for an instant DIY air-con.
- Aim a pedestal fan out the window at night to blow hot air outside.
- If you have a ceiling fan, run it anti-clockwise so it pushes air down.
4. Block the Sun with DIY Window Coverings
Windows facing north or west can let in a surprising amount of heat.
Use whatever you have on hand – tin foil, cardboard, or car windscreen shades – to reflect sunlight back out.
Remove them at night to let cool air in again.
5. Avoid Using Heat-Making Appliances
Every appliance that produces heat adds to your cooling problem.
- Swap the oven for the BBQ, air fryer, or slow cooker.
- Dry clothes outside (they’ll be done in no time).
- Run the dishwasher or washing machine in the evening.
6. Try the Damp Sheet Trick
Dampen a light sheet or towel and hang it in front of a window or fan.
As air passes through, it evaporates the moisture and cools the room.
It’s an old-school trick that actually works.
7. Insulate Against the Heat
Insulation helps keep homes cooler in summer as well as warmer in winter.
If you can’t afford ceiling insulation right now, focus on sealing gaps and using draught stoppers to stop warm air sneaking in.
8. Plant Shade Strategically
If you own your home, plant deciduous trees or tall shrubs near north- and west-facing windows.
They’ll provide shade in summer but still let sunlight through in winter when the leaves drop.
9. Choose Light or Reflective Roof Colours
If your roof is due for repainting, opt for a lighter shade or a paint designed to reflect heat.
Lighter colours absorb less solar energy, which helps keep the roof surface cooler and reduces the amount of heat radiating into your home.
You won’t suddenly drop the inside temperature by 10 °C, but it can make a noticeable difference on hot days – especially when combined with good ceiling insulation and ventilation.
10. Cool Yourself, Not the House
It’s often cheaper and faster to focus on your body temperature instead of the air temperature.
- Drink plenty of water.
- Wear light cotton clothing.
- Use a damp face cloth on your neck or wrists.
- Sit with your feet in a tub of cool water – it works wonders.
11. Sleep Smarter
A few small hacks can make hot nights more bearable:
- Freeze your hot-water bottle and use it as a “cold-water bottle”.
- Swap your duvet for a lightweight cotton or bamboo sheet.
- Chill your pillowcase in the freezer before bed for an instant cool down.
12. Switch to LED Bulbs
Old incandescent bulbs throw out a surprising amount of heat.
Switching to LEDs saves on power and helps keep your rooms cooler — double win.
13. Keep Hot Rooms Contained
If one side of your house cops the afternoon sun, shut the doors to keep that heat from spreading.
You can always open them again once things cool off in the evening.
14. Use Extractor Fans
Run your kitchen and bathroom extractor fans after cooking or showering.
Steam adds humidity, which makes the air feel warmer and stickier.
15. Time Your Chores for Cooler Hours
Vacuuming, ironing, or cooking during the day just adds to the heat.
Shift those tasks to early morning or after sunset — you’ll thank yourself later.
The Bottom Line
Keeping cool in a Kiwi summer doesn’t have to mean cranking up the power bill.
A few smart changes — closing curtains early, using fans wisely, and avoiding unnecessary heat — can make your home far more comfortable.
Start with the simplest tricks and see what difference they make. Sometimes it’s the smallest tweaks that bring the biggest relief.
