If your air conditioning unit is running but not cooling as it should, there could be several underlying causes. Some issues are simple to check, while others require professional attention. Understanding the most common reasons can help you identify the problem early and avoid costly breakdowns.
There are several reasons why your air conditioning may not be performing as well as it should. One common issue you can easily check yourself is dirty filters. When filters become clogged with dust and bacteria, they restrict airflow, forcing the system to work harder without improving performance. Removing the filters and gently brushing or cleaning them can often help resolve this problem. To keep your air conditioning running efficiently, filters should be cleaned or replaced every 1–3 months depending on your environment and usage. Regular servicing is important, as prevention is better than cure. Don’t wait for performance issues or a breakdown, keeping on top of routine maintenance helps ensure comfort, efficiency, and longevity from your system.
One of the most common call-outs we receive is due to incorrect air conditioning remote control settings, rather than a fault with the air conditioning unit itself. While we’re always pleased when there’s nothing wrong with the system, these issues can often be avoided with a quick check of the controls. After every installation, we provide a full walk-through of the remote control and system operation. However, we understand that air conditioning can feel overwhelming for new users, and it’s not always easy to remember every function. Before booking a call out we strongly recommend checking that your remote control settings match the function you want.
For best performance and efficiency, we advise the following: ❄ Snowflake symbol – Cooling mode & ☀ Sunshine symbol – Heating mode. These modes are more precise and reliable than using Auto mode, which can cause confusion and inconsistent temperatures.
Modern air conditioning systems typically allow temperature settings between 16°C and 30°C. However, setting the system to the extreme ends of this range is not energy-efficient and won’t cool or heat your space any faster. Instead, you should set the temperature to your desired room temperature. For most homes and businesses, around 21°C is considered a comfortable setting.
By setting a realistic target temperature, your air conditioning unit’s inverter technology can work properly. This allows the compressor to: Ramp up when needed, Ramp down once the desired temperature is reached & Maintain a steady, comfortable environment This process not only improves comfort but also reduces energy consumption and lowers electricity bills. Once the room reaches your set temperature, the system will enter a standby or low-output mode. At this point, it may appear as though the unit has stopped blowing cold air, this is completely normal. The unit will automatically restart cooling or heating once the room temperature changes.
Another common reason your air conditioning system may not be cooling properly is refrigerant loss. Refrigerant is the substance your air conditioner uses to absorb heat from inside your home and release it outdoors. Without the correct amount, your system simply cannot cool effectively. Unlike filters or remote settings, refrigerant does not get “used up.” If levels are low, it usually means there is a leak somewhere in the system.
Refrigerant handling must always be carried out by a licensed air conditioning technician. At Drayton Air Conditioning, we are F-Gas certified and have over five years of hands-on experience working with modern air conditioning systems. If your air conditioning is not cooling and refrigerant loss is suspected, continuing to operate the system can lead to further damage, reduced efficiency, and costly repairs. Prompt inspection and professional repair are essential to protect your system and restore proper cooling performance.
Many common air conditioning problems such as incorrect settings, reduced cooling performance, or refrigerant issues can be prevented with regular maintenance and servicing. At Drayton Air Conditioning, we strongly recommend scheduling regular maintenance and servicing to keep your system performing at its best all year round. Learn more about our professional air conditioning maintenance and servicing in Shropshire by visiting our dedicated page:
There isn’t a fixed schedule for checking air conditioning filters. How often you should inspect them depends mainly on the environment and how frequently the AC unit is used. General guidance: Every 1 month if the system is used heavily, you have pets, allergies, or the property is in a dusty environment Every 2–3 months for average use in a clean environment Before peak seasons (spring and summer), even if the filters were checked recently Regular checks help maintain airflow, improve efficiency, and protect the system from unnecessary wear.
Minor issues, like replacing & cleaning filters , can be done safely at home. However, complex problems such as refrigerant leaks, electrical faults, compressor issues, or unusual noises should be handled by a licensed F-Gas engineer. Attempting major repairs yourself can be dangerous and may void warranties. Regular maintenance, like filter changes and keeping outdoor units clear of debris, is the safest way to keep your AC running efficiently.
No. Simply topping up refrigerant is not a permanent fix. If your air conditioning has a leak, a licensed engineer must:
