One Small Gadget That Could Help Lower Your Power Bill

Keeping your home comfortable doesn't have to mean cranking up the heater or running the dehumidifier all day. In fact, one of the smartest energy-saving tools you can own is a combined hygrometer and thermometer.

This simple device measures both temperature and humidity, helping you understand what your home really needs. Instead of guessing, you'll have the information to make better decisions—saving electricity while keeping your home healthier and more comfortable.

Why Temperature and Humidity Matter

Most people check the temperature before deciding whether to turn the heater on. But temperature only tells half the story.

Humidity—the amount of moisture in the air—has a big impact on how warm or cold a room feels.

A room that's 18°C with high humidity can feel much colder than a dry room at the same temperature. Likewise, a room with low humidity may feel cooler than expected, leading you to increase the heating unnecessarily.

By measuring both temperature and humidity, you can identify the real cause of discomfort and choose the most energy-efficient solution.

The Ideal Indoor Environment

For most homes, aim for:

• Temperature: 18–21°C in living areas.

• Humidity: 40–60%.

Staying within these ranges helps create a healthier home while reducing the amount of energy needed to keep it comfortable.

How It Can Save You Electricity

Know Whether You Need Heat or Less Moisture

If the room feels cold, your first instinct might be to turn up the heater.

But if your thermometer shows the temperature is already comfortable and the humidity is above 60%, excess moisture may be the real problem. Running a dehumidifier for a while could make the room feel warmer without increasing the heating.

Avoid Running Appliances Longer Than Necessary

Many people leave heaters or dehumidifiers running "just in case."

A combined hygrometer and thermometer tells you exactly when the room has reached a comfortable temperature and humidity level, so you can switch appliances off and avoid unnecessary power use.

Ventilate at the Right Time

Opening windows is a great way to freshen your home—but not always.

If it's a humid day outside, opening windows may let even more moisture into your home. Checking your indoor temperature and humidity can help you decide whether it's better to ventilate naturally or use a dehumidifier instead.

Dry Clothes More Efficiently

Drying washing indoors can release several litres of moisture into your home.

If you notice humidity climbing after hanging out the washing, you can:

• Open a window if conditions are suitable.

• Use a dehumidifier nearby.

• Move washing outdoors when possible.

Keeping indoor humidity under control means your home will feel warmer and cost less to heat.

Protect Your Home Too

Maintaining the right temperature and humidity doesn't just save power—it also helps protect your home by:

• Reducing condensation on windows.

• Preventing mould and mildew.

• Protecting furniture and timber from excess moisture.

• Creating a healthier indoor environment for your whānau.

A Small Investment with Big Benefits

Combined hygrometer and thermometer units are inexpensive, easy to use, and available from most hardware stores and homeware retailers.

Place one in the living room or hallway, and another in damp-prone areas such as the laundry or bedrooms. After a few days, you'll begin to notice patterns and learn exactly when your home needs heating, ventilation, or moisture control.

The Bottom Line

You can't manage what you don't measure.

A combined hygrometer and thermometer takes the guesswork out of keeping your home comfortable. By monitoring both temperature and humidity, you can use your heater, dehumidifier, and ventilation more efficiently—helping to lower your electricity bill while creating a warmer, healthier home.

Sometimes the smartest way to save energy isn't buying a bigger appliance—it's simply understanding what your home is telling you.

If you're looking for more ways to save energy, improve your home's warmth, or reduce your power bills, get in touch with our Energy Navigator. We're here to help you find practical solutions and choose the power plan that's right for you.