Installation Fails: Common Aircon Mistakes

Struggling with a new air conditioner that won’t work right? Picking the wrong size AC unit can leave you sweating and frustrated. Our guide zooms in on typical slip-ups during AC installations and how to dodge them, ensuring your home stays cool and comfortable.

Keep reading – we’re about to make things a breeze!

Common AC Installation Errors

Navigating the pitfalls of air conditioner installation can be a complex process, with myriad factors contributing to potentially costly and inefficient outcomes. From choosing an improper unit size to skimping on essential checks, these missteps commonly disrupt comfort and energy savings, underscoring the importance of meticulous attention to detail during setup.

Incorrect Size of the AC Unit


Selecting an air conditioning unit with the right cooling capacity for your space is essential. A too-small AC won’t cool your room effectively, causing it to run continuously and ramp up your electricity bills.

Conversely, an oversized air conditioner cools the room quickly but doesn’t dehumidify properly, leading to a damp environment that can encourage mould growth and negatively affect indoor air quality.

Professional installation is key to avoiding these energy efficiency pitfalls. Experts assess various factors such as room size, local climate, and insulation levels before recommending the correct British Thermal Units (BTUs) for your system.

This ensures peak performance from your air conditioning system without unnecessary energy wastage or compromise on comfort and indoor air standards.

Poor Placement of the Air Conditioner


Placing your air conditioner in the wrong spot can seriously hurt its performance. You might find that rooms stay too warm or get too chilly because of poor airflow. It’s a common installation error, but it has a big impact on how comfortable you feel at home.

For example, if an outdoor unit is stuck in a tight space, the heat exchanger won’t work as well and can’t cool things down properly.

The indoor unit needs attention too; put it in the wrong place and you could have issues with humidity control. This isn’t just about comfort – when your AC struggles, energy bills can soar.

So getting that perfect spot is key for keeping everything dehumidified without wasting power or money. Remember to keep it away from heat sources like ovens or direct sunlight to maintain peak efficiency and ensure even room temperature throughout your living space.

Misplacement of the Thermostat


Placing your thermostat in the wrong location can wreak havoc on your air conditioning system’s efficiency. If it’s too close to hot windows, kitchens, or doors that open frequently, your aircon might get false readings.

This causes it to work overtime and cool your home unevenly. Your living space becomes less comfortable, but your energy bills also surge.

Ensuring the thermostat is positioned away from direct sunlight and other heat sources is critical for accurate temperature control. It should also be set at an average height on an interior wall where natural room air currents are common.

An ideal spot helps maintain consistent communication with the entire HVAC system, preventing short cycles of cooling and heating that stress both your comfort levels and appliance lifespan.

Installation Without Checking for Leaks


Installing air conditioners demands careful attention to detail, and one vital step that should never be skipped is checking for leaks. Leaks in the system can lead to many problems, including reduced efficiency and increased wear on the unit.

Technicians must test for refrigerant leaks after setting up an AC to prevent issues that could compromise its performance or cause health concerns through poor air quality.

Ensuring seals are tight and connections secure protects against minor punctures that might go unnoticed during installation. Such diligence helps maintain the optimal functionality of your air-conditioning system, safeguarding it from indoor air pollution caused by uncontrolled pollutants entering through gaps left by hasty installations.

Regular checks post-installation also ensure that potential leakages are caught early before they escalate into more significant complications needing costly repairs or complete replacements.

Poorly Built Drainage System


A poorly built drainage system in your central air-conditioning unit can lead to many issues. Moisture that doesn’t drain properly becomes a breeding ground for mould within the air ducts, causing health problems and potentially damaging your home’s structure.

As water builds up, it may seep into areas like the crawlspace or leak through ceilings, creating an expensive mess.

Ensure technicians configure the overflow drain correctly during installation to prevent moisture buildup. This small detail is crucial for maintaining healthy air flow and avoiding unnecessary repairs down the line.

Regular checks on the drainage system also keep it clear of blockages that could disrupt your AC’s efficiency and bring about unwanted headaches.

Choosing the Right Location for Your Aircon Unit

Picking a shady spot for your aircon unit can boost its efficiency and extend its life. The heat from the sun can force it to work harder, which means more energy use and higher bills.

It’s best to place outdoor units on your home’s north or east side where they get less direct sunlight. Make sure there’s plenty of room around the unit too. At least 60 centimetres of clearance is needed to ensure good airflow and easy maintenance.

Thinking about drainage at installation time prevents water damage trouble later on. Aircons create condensation that needs somewhere to go, so check that there’s a clear path for water to drain away without affecting your home’s structure or creating dampness problems.

Also, positioning indoor and outdoor parts away from obstructions avoids restricting airflow, ensuring your central air conditioning system works smoothly without unnecessary pressure on any component.


In conclusion, correctly installing your aircon is crucial to ensure it runs efficiently. Avoid common errors like incorrect sizing and placement to dodge performance issues. Engage skilled technicians who follow proper procedures for a reliable setup.

Make informed choices about your unit’s location for optimal cooling. Always prioritise professional guidance to prevent installation fails and enjoy a comfortable indoor climate.


1. What are some common mistakes to avoid during air conditioning installation?

Avoid incorrect thermostat placement, poor insulating foam application, and installing a central air-conditioning system without proper planning.

2. Why is the thermostat’s location important in a ductless mini-split system?

Correct thermostat placement ensures your heating, ventilation, and air conditioning (HVAC) system reads temperatures accurately for efficient climate control.

3. Can you save energy with a programmable thermostat in a central air conditioner?

Yes, using a programmable thermostat allows better temperature management which can lead to energy savings by matching your living patterns.

4. What should I check when my new AC fails after installation?

Ensure there were no installation mistakes such as improper handling of refrigerant lines or faulty electrical connections within the air conditioning units.

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