A common question we hear is, ‘How often should your air conditioning/HVAC be serviced?’
Our AC experts recommend that your system be serviced at least twice per calendar year, helping to ensure it is working at maximum efficiency.
Regular servicing of your air conditioning or HVAC system is essential for efficiency, reliability, and longevity. Without proper maintenance, systems can underperform, consume more energy, and circulate dirty air. Understanding how often to service your unit helps prevent problems and keeps your system running smoothly.
This guide will cover:
- Your Quick Servicing Guide
- The Importance of Air Conditioner Servicing
- Maintaining Your HVAC System Between Services
- Professional AC Maintenance: Call Our Team Today
Key Takeaways
- Air conditioners should be serviced at least once per year to maintain efficiency and prevent breakdowns.
- Commercial air conditioning units require servicing every 3–6 months due to higher operational demands.
- Heavy-use systems, such as those in offices or factories, need maintenance twice yearly for optimal performance.
- Regular servicing improves energy efficiency and reduces electricity costs.
- Maintenance extends the lifespan of air conditioning systems.
- Routine checks prevent unexpected failures and costly repairs.
Your Quick Servicing Guide
The majority of issues air conditioning units face are when the system has not had regular maintenance services. Service checks are crucial to the lifespan of your air conditioning system: filters, coils and fins all require maintenance at regular periods to prolong their effectiveness.
Neglecting maintenance appointments ensures only one thing: a decrease in the performance and lifespan of the air conditioning system. The knock-on effect is that airflow becomes restricted, creating extra pressure on the system, driving up power consumption. An unmaintained system becomes less efficient at its primary function – conditioning air – expelling dirtier, unwelcome (smelly) air into the atmosphere.
Clogged, dirty air filters will block normal airflow, causing residue to settle on the evaporator coil, which directly dampens heat absorption, shortening the HVAC system’s lifespan.
Air conditioner servicing requires regular maintenance checks from a qualified engineer. Typically, they will include:
- Control panel operational checks
- Electrical controls
- Pressure switches
- Flow switches
- Safety and limiting components
- Actuators and dampers
- Fans
- Filters
- Heaters
- Humidifiers
- Evaporators
- Refrigeration systems
- Condensers
- Water pumps
The Importance of Air Conditioner Servicing
Proper maintenance checks and services of your air conditioning system and heating equipment will ensure they are more economical and dependable.
Without proper maintenance, your air conditioner loses approximately 5% of its overall efficiency: 5% for each year it goes without service. Monthly energy costs can be reduced by up to 25% when the system is correctly maintained and running at optimal efficiency.
As residential heating and cooling systems are delicate components, regular maintenance checks can effectively double their lifespan.
We recommend, at a minimum, that you schedule two annual air conditioner servicing appointments for your AC system.
Service Frequency by Unit Type
Not all air conditioning systems are the same, and their servicing needs vary depending on usage, environment, and system type. Knowing the recommended service intervals for your unit ensures maximum efficiency, prevents breakdowns, and helps extend the system’s lifespan.
Domestic and Residential Units
For most homes, air conditioners should be serviced at least once a year, ideally twice, once in spring and again in autumn. Spring maintenance prepares the unit for warmer months, while autumn checks ensure heating functions (if applicable) are working properly. Regular servicing prevents minor issues from escalating into costly repairs.
Commercial and Office Systems
Office and commercial units operate more frequently and cover larger spaces. They should be serviced every 3-6 months to maintain consistent performance, protect indoor air quality, and avoid disruption to business operations.
Heavy-Use Environments
Air conditioners in gyms, restaurants, or dusty warehouses require twice-yearly maintenance. Continuous operation and exposure to dust can cause wear on fans, filters, and compressors. Regular servicing ensures reliability and efficiency.
Reverse-Cycle Systems
Reverse-cycle units provide both heating and cooling. They should be serviced twice a year, in spring for cooling, and autumn for heating. Maintenance ensures the system switches efficiently between modes and operates safely.
Industrial Units
Industrial systems face harsh conditions and near-constant use, making quarterly maintenance essential. Frequent checks protect critical components, maintain efficiency, and reduce the risk of downtime.
Maintaining Your HVAC System Between Services
Between scheduled air conditioner servicing, regular maintenance spot-checks and routine cleaning tasks of the AC system, its lifespan and maintain its energy efficiency. Let’s explore some of the main HVAC elements that should be included in your regular maintenance routine and how to take care of them.
Air Conditioning Filters
Cleaning or replacing the filters of an AC unit is the most crucial task in maintaining the optimal efficiency of the system.
Once you open up the AC unit and locate the visible filters:
- Remove them from the unit.
- Clean away any dry debris.
- Wash the filters in warm, soapy water.
- Allow them to dry thoroughly.
- Once the internal coil is clean and the filters (if reusable) are dry, place them back into the AC unit.
We recommend cleaning or replacing an AC’s filters every month or two, during the cooler months. In warmer seasons – when AC usage is heavier – filters may require more attention.
Air Conditioning Coils
The condenser and evaporator coils within an AC unit collect dirt and grime over time, reducing their performance. Clean filters will prevent the evaporator coil from collecting dirt; however, condenser coils will always get dirty.
As with most components within an air conditioning system, excessive dirt will affect the performance and efficiency of the whole system.
To clean the coils, once the AC unit is open, the filters are removed:
- Remove internal coils
- Soak them in an anti-corrosive disinfectant solution.
- Allow them to sit within the solution for ten minutes.
- Delicately wipe clean the coils and replace them within the AC housing unit.
Coils should be checked at least once per year and cleaned as necessary.
Coil Fins
Over time, debris can accumulate within the aluminium fins, which can lead them to become blocked or even bent: this will cause a decrease in the performance and efficiency of the AC unit.
To correct this, a tool known as a fin comb can be bought at AC wholesalers, which can revise the aluminium fins to near-new condition.
Condensate Drains
Though overlooked, the condensate drains can become clogged and reduce the unit’s capacity to reduce humidity.
Throughout the year, use a stiff wire/metal to prod through the drain system to dislodge any rogue blockages.
Window Seals for In-Room AC Units
When the colder weather begins to set in, an inspection of the primary seal between every AC unit in your HVAC system and window frame is advisable: this is to determine if the seal still makes contact with the AC’s metal case – as, over time, moisture can cause damage to the seal, creating a draft and internal air to escape your home.
Warranty Requirements
Many homeowners and businesses overlook an important aspect of maintenance: warranty protection. Regular servicing not only keeps your system running efficiently but also ensures that manufacturer warranties remain valid. Understanding how servicing impacts your warranty can save significant costs if repairs are ever needed.
- Warranty Coverage: Proof of regular, professional maintenance is typically required.
- Manufacturer Guidelines: Follow specific service intervals and use approved parts to maintain coverage.
- Documentation: Keep service reports and receipts as evidence for warranty claims.
- Skipping Maintenance: Missing scheduled servicing may void your warranty, leaving you responsible for repair costs.
Tip: Always check your manufacturer’s terms for servicing requirements, as some warranties specify certified engineers or detailed maintenance checklists.
Signs Your AC Needs Servicing
Even well-maintained systems can show early warning signs of trouble. Recognising these signs allows you to schedule maintenance before small problems turn into major repairs, keeping your home or workplace comfortable and efficient.
- Unusual Noises or Vibrations: May indicate worn components or loose parts.
- Reduced Cooling or Heating Efficiency: Could signal airflow or refrigerant issues.
- Higher Energy Bills: This suggests your system is working harder than normal.
- Poor Air Quality or Strange Odours: Indicates dirty filters, coils, or drainage problems.
- Frequent Cycling On/Off: Short cycling stresses the compressor and reduces efficiency.
Seasonal Service Timing Recommendations
Servicing your air conditioner at the right time of year ensures optimal performance throughout every season. Seasonal checks prepare your system for the demands of both heating and cooling, prevent breakdowns, and maintain energy efficiency.
- Spring (March-April): Pre-cooling season checks for filters, coils, and refrigerants.
- Autumn (September-October): Heating function inspection for reverse-cycle systems.
- Winter: Basic maintenance, like filter cleaning, helps maintain airflow and indoor air quality.
- Summer: Performance monitoring during peak usage prevents overheating and maintains cooling efficiency.
Professional AC Maintenance: Call Our Team Today
Domestic and commercial customers alike require cleaning and maintenance of air conditioning systems. At PRA, we pride ourselves on our industry knowledge and growing reputation.
Many manufacturers request proof of AC maintenance checks: this is typically a part of the warranty process. Calling on the experts at PRA Air Conditioning ensures that your HVAC system will run efficiently for years to come.
There is no room for complacency at PRA Air Conditioning – give us a call today.
FAQ
How can I tell if my air conditioner needs servicing?
Warning signs include reduced cooling or heating performance, unusual noises, bad odours, or higher energy bills. If your AC is running but not keeping the room comfortable, it’s likely due for maintenance.
How often should an air conditioner be serviced in the UK?
Most systems should be serviced once a year to maintain efficiency, extend lifespan, and comply with manufacturer warranties. Heavy-use systems (such as in offices or commercial spaces) may require more frequent checks.
Does every air conditioner need servicing?
Yes, even if your AC seems to be working fine, regular servicing prevents breakdowns, improves efficiency, and ensures safe operation. Skipping maintenance can cause small issues to develop into costly repairs.
Do I still need to service my air conditioner if it’s under warranty?
Yes, in fact, most warranties require proof of regular servicing by a qualified engineer. Skipping services could invalidate your warranty, leaving you unprotected if a fault develops.
What happens if I don’t service my air conditioner regularly?
A poorly maintained AC will become less efficient, use more electricity, and be more prone to breakdowns. Dust and debris can also lead to poor air quality. In the long run, neglecting servicing will cost more in repairs or even early replacement.