Choosing an efficient hot water solution is an important consideration for households looking to manage energy use while maintaining a reliable supply of hot water. Heat pump water heaters work differently from conventional electric systems by using heat from the surrounding air to help warm water stored in a tank. Understanding how this technology works can make it easier to determine whether it suits a particular home.

How Heat Pump Hot Water Systems Work

When researching heat pump hot water systems Perth, homeowners will find that these units transfer heat from the surrounding air into the water rather than relying primarily on an electric heating element. The process is similar in principle to refrigeration technology operating in reverse. Electricity is still required to run the system, but much of the heating process involves transferring existing heat.

Factors such as household hot water demand, available installation space, unit capacity and operating…

I was Googling options for staying overnight on a boat and ended up looking into how you’d keep the cabin cool. Naturally, the HVAC side of things distracted me from actually finding somewhere to stay.

I came across a company called Blue-Airco, which makes marine air conditioners that run directly from 12, 24 or 48 V batteries. They use variable-speed compressors, so the cooling output can adjust to suit the load. With the right battery setup, you can run the air conditioning without having the generator going at the same time.

That caught my attention. Being anchored somewhere nice sounds great, but trying to sleep in a hot cabin or listening to a generator all night would take a bit away from it.

Obviously, the battery capacity is the big question. Cooling one bedroom overnight is different from cooling the whole boat, and you still need enough energy left for…

One of the more interesting ideas in cooling technology has a surprisingly small source of inspiration: the Saharan silver ant.

Hong Kong company i2Cool has developed passive cooling materials inspired by the insect’s ability to survive extreme desert heat. Its coatings aim to keep building surfaces cooler without electricity powering the cooling process.

The science behind it is real. Research published in 2015 found that the ant’s distinctive silver hairs help reflect sunlight and release body heat through infrared radiation. Essentially, nature gave these ants a way to manage heat long before anyone fitted a split system.

i2Cool applies similar principles to building materials. Its coatings combine high solar reflectivity with the ability to release heat as infrared radiation. The company reports solar reflectivity of up to 95% for its cooling coating—meaning much of the incoming sunlight is reflected rather than absorbed. That figure describes reflectivity, not a 95% reduction…

Enjoyed a recent family trip to Bali, but apparently I can’t switch off completely. Everyone else was admiring the scenery while I was inspecting condensers and cables. 😂

Compared with what I’m used to in Adelaide, the services were much more visible outdoor units lining the steps, pipework heading in every direction with insulation ends left uncapped, and overhead cables looking like a giant bowl of spaghetti.

A bit messy in places, but still doing the job and keeping everyone cool. Different surroundings, same goal and in Bali’s humidity, you certainly appreciate the air con!

Anyone else take photos of HVAC installations on holiday, or is that just me?

A loose belt can slip and overheat. Excessive tension increases bearing loads and can shorten belt and bearing life. The aim is to achieve the manufacturer’s specified tension.

This procedure applies to conventional V-belts on an adjustable motor base. Always check the instructions for the particular fan and belt.

1. Isolate the equipment

Stop the fan, isolate and lock out the electrical supply, and verify the equipment is safe before removing guards. Allow the fan to stop completely and prevent airflow from other equipment turning it. A BMS stop command alone is not isolation.

2. Inspect the belts and pulleys

Check for cracking, fraying, glazing, contamination and worn pulley grooves. Check the motor mounting and fan bearings. On multiple-belt drives, replace worn belts as a suitable matched set. Release tension before fitting belts—never force them over a pulley.

A compressor’s insulation resistance might be above the manufacturer’s minimum, but what if it has dropped significantly since the previous service?

Would that change your assessment?

A spot insulation-resistance test provides one piece of information. Where recommended by the manufacturer, a polarisation index (PI) test adds another by measuring how insulation resistance changes during a continuous test.

The compressor remains switched off and electrically isolated throughout. The ten minutes refers to the insulation tester running—not the compressor.

The insulation tester applies a steady DC test voltage to the winding insulation:

• After 1 minute, record the insulation resistance.

Your aircon is switched on and blowing air, but the room still feels warm. Before booking a technician, here are a few simple checks that may help narrow down the problem.

1️⃣ Check the mode and temperature

Make sure it’s set to COOL, usually shown by a snowflake symbol. FAN mode only circulates air.

Set the temperature below the current room temperature and allow time for cooling to start. Some units have a short compressor restart delay.

2️⃣ Check the filters

Dirty filters restrict airflow and can reduce cooling performance. Clean washable filters according to your unit’s instructions and let them dry before refitting.

In hot, humid climates, air conditioning often runs for long hours. Keeping it clean helps maintain airflow, cooling performance and reliable drainage.

🧼 Air filters: about every two weeks

For a split system used daily, checking and cleaning the washable filters every two weeks is a good starting point. Dusty rooms, pets or heavy use may mean they need attention sooner.

Follow your unit’s instructions—some specialty filters aren’t washable.

🔧 Internal cleaning: depends on use and condition

Clean filters don’t necessarily mean a clean unit. Dirt can also build up on the indoor coil, blower wheel, drain tray and drain pipe.

I see this fault constantly on wall-mounted split systems, especially in hot and humid climates.

The indoor unit is cooling, but after a while water starts dripping from the front of the aircon, running down the wall, or leaking from one side of the unit.

What are the most common causes?

1. Blocked condensate drain

This is probably the first thing to check.

As the evaporator cools the room air, moisture condenses on the coil and runs into the drain tray.