Air conditioning remote and settings guide
Air conditioning remotes can look intimidating, with rows of small icons for modes, fan speeds and timers that most people never touch beyond the on and off buttons. Understanding what each setting actually does makes a real difference, both to comfort and to how much the system costs to run.
This guide walks through the main modes and settings found on most modern split systems, with sensible defaults and a look at the habits that quietly waste energy or leave a room less comfortable than it should be.
The main modes
- Cool mode: the standard setting for reducing room temperature, drawing heat out of the room and rejecting it outside.
- Heat mode: available on heat pump systems, reversing the cycle to bring heat into the room, useful as a supplementary heat source outside of peak winter.
- Fan mode: circulates air without heating or cooling, useful for gentle air movement on mild days without running the compressor.
- Dry mode: reduces humidity without significant cooling, useful on muggy days when the room already feels cool enough but sticky.
- Auto mode: lets the unit choose between heating and cooling to reach and hold the set temperature, convenient but less predictable in running cost than choosing a mode manually.
Fan speed and airflow direction
Higher fan speeds cool or heat a room faster but are noisier, while lower speeds are quieter and more comfortable for background running once the room is near the set temperature. Many people leave the fan on the highest setting permanently, which is rarely necessary once a room has reached a comfortable temperature.
Louvre direction also matters more than most people expect: pointing airflow directly at where people sit can feel like a draught even at a reasonable temperature, while directing it upward or across the room gives more even, less noticeable cooling.
Sensible set points
As a guide, a set point of around 21 to 24 degrees Celsius in cooling mode is comfortable for most people without the system working harder than necessary. Setting the temperature much lower than you actually want, in the belief it will cool the room faster, doesn't work: the unit cools at the same rate regardless of set point, it just keeps running longer once the lower temperature is reached.
For heating, a similar range typically applies, and pushing the set point unnecessarily high simply means the system works harder to reach and hold a temperature well above what's actually needed for comfort.
Timers and scheduling
Most units allow on and off timers, and many app-connected systems allow full weekly scheduling. Using a timer to bring a room to temperature shortly before it's needed, rather than leaving the system running constantly throughout the day, is one of the simplest ways to reduce running costs without any loss of comfort.
In commercial settings, scheduling is particularly worthwhile, since it avoids air conditioning running overnight or over weekends in empty premises, which is a surprisingly common and entirely avoidable cost.
Common misuse and getting more from your system
The most common habits we see that waste money or reduce comfort are leaving units running on the coldest possible setting with the highest fan speed at all times, opening windows or doors while the system runs, and forgetting to use dry mode on humid days when full cooling isn't actually needed. Small changes to these habits usually make a noticeable difference to running costs.
If you're unsure how to get the best from your particular system's remote or app, or if a unit isn't responding sensibly to its settings, that's often worth a service visit to check rather than assuming it's just an odd remote. Get in touch for a free quote if you'd like a service or a new system set up properly from the start.
FAQs
Common questions
Does setting a colder temperature cool the room faster?
No, the unit cools at the same rate regardless of the set point, it simply keeps running for longer once that lower temperature is reached.
What is dry mode actually for?
It removes moisture from the air with only mild cooling, useful on humid but not especially hot days when full cooling would overcool the room.
Should I leave air conditioning running all day?
Generally no, using a timer or schedule to run it only when the room is occupied is more cost-effective than continuous running.
Why does my room feel draughty even though it's at the right temperature?
This is usually airflow direction pointing straight at where people are sitting rather than the temperature itself, and adjusting the louvres often solves it.
Is auto mode a good default setting?
It's convenient and works well for many households, though manually choosing cool or heat mode gives more predictable running costs if you want tighter control.
Keep reading
More from our knowledge base
Sector & property-type guides
Air conditioning for bedrooms and better sleep
Bedroom air conditioning has a different brief to a living room or office: it needs to be heard as little as possible, and felt as little as possible.
System & comparison guides
What is a split air conditioner?
A split system divides the air conditioner into two halves joined by pipework, so the noisy parts live outside and only a quiet unit sits in the room.
System & comparison guides
Domestic vs Commercial Air Conditioning: The Real Differences
Short answer: a home usually needs quiet wall units sized room by room, while a business needs equipment chosen for longer hours, more people and legal record keeping.
Talk it through with an engineer.
No call centre — you speak to Ted directly.