As winter settles across the UK, many homeowners face a familiar question: what should you do with your air conditioning system when temperatures drop? While modern air conditioning units often feature both heating and cooling modes, they’re still used less frequently in colder months. For some, the system is switched off entirely, while others rely on it occasionally for mild heating or dehumidifying. Knowing how to handle your air conditioner properly during winter can protect your investment and keep it running efficiently when warmer weather returns.
Why “Not Running Much” Matters
When your unit isn’t in use, several things happen that can shorten its lifespan. For example, the lubricants inside the compressor may settle, filters can become clogged, and moisture trapped in the coils may lead to mould. Even if you’re not cooling your home, it’s wise to run your air conditioner periodically in fan mode. This keeps internal components moving and helps maintain proper airflow.
Risks of Extended Non-Use
- Dust and Debris Accumulation: When your system remains idle, dust can collect inside both indoor and outdoor components, reducing airflow and efficiency.
- Moisture and Corrosion: Condensation can form within the outdoor unit, potentially leading to rust or electrical damage.
- Reduced Performance: A system left untouched for months may struggle to restart at full capacity in spring, leading to uneven cooling or unexpected repairs.
Storage vs. Active Use – Which Is Better?
There are two approaches to winter care: full storage or limited active use. For portable conditioning units, proper storage in a dry, indoor space is ideal. For split systems or fixed air conditioning units, occasional use in fan or heat mode helps maintain performance. This practice prevents stagnation, protects moving parts, and ensures the system remains operational throughout the year.
For personalised advice or to schedule professional servicing, you can contact L&A Air Conditioning Ltd or request a free consultation.
When It Makes Sense to Actively Use Your Air-Con Through Winter
Many homeowners switch off their air conditioning as soon as the colder months arrive, believing it is unnecessary until spring. However, there are several situations where running your system occasionally during winter can actually be beneficial. Beyond just heating, it can help maintain air quality, reduce dampness, and keep the system components in good working order.
Circulating Air to Prevent Stagnation
When a property is tightly sealed for warmth, indoor air can quickly become stale. Using your air conditioner on a low fan setting every so often helps circulate air throughout the rooms, preventing moisture build-up and musty odours. This circulation also supports even temperature distribution, especially in homes that use mixed heating systems.
Reducing Humidity and Preventing Damp
Many homes in the UK experience excess indoor humidity during winter, particularly in kitchens, bathrooms, and poorly ventilated rooms. Operating your unit briefly each week can help dehumidify the air, keeping condensation under control and preventing issues like mould growth and damp walls. This is especially important for those living in older homes or flats with limited ventilation.
Protecting System Health and Efficiency
Running the system occasionally prevents internal parts from seizing up during long idle periods. Compressors, fans, and valves benefit from regular motion, keeping lubricants flowing and mechanical wear minimal. For newer air conditioning units with inverter technology, even short usage helps maintain consistent performance and energy efficiency throughout the year.
Managing Energy Costs and Comfort Levels
Using your air conditioner in winter does not have to mean high energy bills. Short, controlled cycles on an energy-efficient mode can enhance comfort without straining your budget. Mild UK winters often make it practical to use the system’s heat pump function for gentle heating, which can be cheaper than traditional electric heaters. The key is moderation—occasional use is enough to keep your system active and your home comfortable.
When It Might Be Better to Leave It Off
Of course, not every day calls for active use. When temperatures drop significantly below freezing, outdoor units can struggle to operate efficiently, and running them unnecessarily can waste energy. It’s best to use your system when humidity levels rise or the indoor air feels stagnant, rather than running it continuously.
Practical Winter Tips
- Use the low fan mode for gentle air circulation.
- Run short 10–15-minute cycles every few days.
- Check filters and vents to ensure unobstructed airflow.
- Monitor humidity using an indoor hygrometer for optimal control.
Keeping your air conditioning in light use throughout winter keeps it primed for summer performance. It also helps maintain better air quality and a fresher indoor environment. With a little attention and balance, your air conditioner can stay in top condition all year long, saving you time, money, and effort later. Proper care of your conditioning units today ensures that your air conditioning units continue running efficiently whenever you need them most.
How to Properly Store or “Hibernate” Your Air-Con When Not in Use
When the colder months arrive, it’s easy to forget about your air conditioning system. However, if you want it to perform at its best once summer returns, proper storage and maintenance are key. Whether you use a portable unit or a fixed wall-mounted system, “hibernating” your air conditioner correctly helps prevent damage, mould growth, and unnecessary wear. Here’s how to keep your system in top shape during its off-season.
Step 1: Clean and Prepare Your System
Before you pack your unit away, make sure it’s thoroughly cleaned. Start by removing and washing the filters, as dust and debris left inside can lead to unpleasant odours and reduced efficiency later. Clean the vents, coils, and exterior surfaces with a soft cloth and mild detergent. For portable air conditioning units, drain any remaining water from the tank to prevent mould or mildew buildup.
If you have a split or fixed air conditioner, check that the outdoor and indoor units are clear of dirt and leaves. A gentle wipe-down and inspection of the outdoor casing will help prevent corrosion during the winter months.
Step 2: Choose the Right Storage Location
The ideal storage space for conditioning units is a dry, cool environment with good ventilation. Avoid areas exposed to direct sunlight or extreme temperature changes, as these can cause damage to electrical components and seals. Basements, garages, or utility rooms often work well, as long as they are not damp or prone to condensation.
Always store portable units upright to maintain the compressor’s oil balance. Laying it on its side can lead to internal damage that affects performance. For wall-mounted or outdoor units, ensure the area around them remains free from debris and snow buildup.
Step 3: Avoid Common Storage Mistakes
One of the biggest mistakes homeowners make is covering their air conditioning units with non-breathable materials, such as plastic sheets. These can trap moisture, leading to rust and mould growth. Instead, use a breathable fabric cover or a purpose-made air-con cover designed for ventilation.
Also, avoid neglecting the system entirely. Even during months of non-use, it’s a good idea to check your air conditioning once or twice. Briefly running the fan mode helps keep parts lubricated and prevents unpleasant smells from developing.
Step 4: Follow a Simple Homeowner’s Checklist
For UK homeowners, seasonal maintenance should include:
- Cleaning filters and vents
- Draining water and moisture
- Inspecting cords, hoses, and seals
- Covering the unit with a breathable fabric
- Storing in a dry, upright position
Step 5: Prepare for the Next Cooling Season
When warmer weather approaches, give your system a quick inspection before turning it on. Reinstall clean filters, remove the cover, and let the air conditioner run briefly to ensure everything is functioning properly. Proper storage not only protects your investment but also ensures efficient, reliable cooling for years to come.
Making the Right Decision for Your Home, Budget, and System
When winter arrives, many homeowners start wondering whether to shut down their air conditioning system entirely or keep it running lightly during the colder months. The right decision depends on your home’s setup, energy goals, and the type of unit you own. Making a well-informed choice ensures comfort, efficiency, and savings both now and in the long run.
Quick Decision Matrix: What to Consider
Every home is different, so it’s important to assess your situation carefully before deciding. Ask yourself these key questions:
- What type of system do you have? Split systems and heat pumps often perform differently in winter conditions.
- How is your home insulated? Well-insulated properties retain warmth longer, reducing the need for active use.
- What is your energy cost and usage pattern? If your electricity rates are high, you might save more by reducing operation time.
- What is the winter climate like in your area? Homes in mild UK regions may benefit from light active use, while colder areas can justify full storage.
Cost Benefit: Balancing Energy, Wear, and Convenience
Winter storage saves on electricity but can sometimes lead to mechanical strain if the system sits unused for months. On the other hand, running your air conditioning lightly keeps components lubricated and prevents dust buildup. The trade-off lies in short-term energy savings versus long-term system health.
If you plan to use your unit sparingly, adjust your settings for energy-efficient operation. If you store it, follow manufacturer guidelines for proper shutdown, cleaning, and cover protection. Either way, a well-planned approach will help you get the most from your system.
Maintenance and Check-In Plan
Whether you choose storage or light active use, schedule a professional inspection before the start of the next cooling season. Have a qualified engineer check refrigerant levels, filters, and electrical components. For stored systems, ensure all covers are removed and the outdoor unit is free from debris or moisture before restarting. Regular maintenance keeps your air conditioning system reliable, efficient, and ready to perform when temperatures rise again.
UK-Specific Tips
In the UK, mild and damp winters can affect system components differently than colder climates. It is advisable to check local regulations on refrigerant handling and seek out certified engineers who meet UK compliance standards. Availability of maintenance services may vary by region, so booking early ensures timely inspections and professional support.
Protect Your Investment with Expert Maintenance
Choosing the right approach for your air conditioning system this winter is easier with expert guidance. At L&A Air Conditioning Ltd, we offer complete installation, repair, and maintenance services for homes and businesses. From free consultations to 24-hour emergency service and manufacturer warranties, we make it easy to keep your system efficient and reliable.
Ready to prepare your unit for the season ahead? Email us at info@la-airconditioningltd.co.uk or call 07949 008486 to schedule your maintenance today.