5 Signs Your Air Conditioning System Needs a Winter Service
As winter approaches and temperatures across London start to drop, most homeowners naturally think about boilers and radiators. But the truth is, your air conditioning system needs just as much attention during the colder months — especially if you rely on it for heating. Modern air conditioning systems that double as heat pumps are incredibly efficient, but like any piece of equipment, they need the right care to perform properly through winter.
If you're not sure whether your system is ready for the colder weather, here are five clear signs it may be time to book a winter service before problems start to show.
Your System Is Taking Longer Than Usual to Heat the Room
You might notice that your air conditioning system takes longer to bring the room up to temperature. It could be that the filters are clogged, the refrigerant levels are low, or the system is working harder than normal because something isn’t performing quite as it should. When a system is struggling to reach the temperature you’ve set, it’s usually a sign that it needs a professional check-up. A quick winter service can restore efficiency and get your home heating smoothly again.
Your Energy Bills Are Increasing for No Clear Reason
If your winter energy bills seem higher than last year, and nothing in your daily routine has changed, your air conditioning system may be consuming more electricity than it should. As dust, debris, or worn components build up inside the system, it has to work harder to produce the same amount of heat. This extra strain directly translates to increased running costs. A winter service ensures all components are cleaned, checked, and running efficiently, helping to keep your bills under control.
You’re Hearing Sounds You Didn’t Hear Before
Air conditioning systems tend to run quietly when they’re in good condition, so any unusual noises during heating mode shouldn’t be ignored. You might notice a rattling sound from a loose internal component, a buzzing noise from the outdoor unit, or a whirring sound that wasn’t there last year. These are often early warning signs that something needs tightening, replacing, or cleaning. Servicing the system early in winter helps prevent small issues from turning into major breakdowns at the worst time.
There’s an Unusual Smell When the System Switches On
Some homeowners notice a smell when the air conditioning is used for heating, especially if it hasn’t been turned on for a while. This can happen when dust builds up on internal components, or when moisture collects and causes unpleasant odours. A system that hasn’t been serviced recently may also develop bacterial growth in areas where warm air flows. A winter service eliminates these odours, cleans the internal parts, and ensures you’re breathing fresh, clean air throughout the season.
The Airflow Feels Weaker Than It Should Be
If the airflow from the indoor unit seems weaker than normal, it can be a sign of a blocked filter, a fan issue, or restricted airflow within the system. Reduced airflow not only affects comfort-levels — it also forces the system to work much harder, which increases wear, energy usage, and the likelihood of a breakdown. A winter service restores airflow by cleaning filters, checking the fan motor, and ensuring air channels are clear and efficient.
Why Winter Service Matters for London Homes
Winter puts a different kind of pressure on air conditioning systems. Instead of cooling, they’re extracting heat from cold outside air and working more consistently to keep your home comfortable. When a system isn’t serviced regularly, it loses efficiency, becomes noisier, and is far more likely to break down during a cold spell. A professional winter service helps your system operate at peak performance, prevents expensive emergency callouts, and ensures your home stays warm when you need it most.
How INS Air Conditioning Can Help
At INS Air Conditioning, we provide winter servicing for homes across London and the surrounding areas. Our experienced, F-Gas-certified engineers carefully inspect every part of your system, clean essential components, check refrigerant levels, test electrical connections, and make sure your AC is fully prepared for the winter months. Whether you use your system for occasional heating or rely on it daily, a winter service is the easiest way to improve comfort, reduce energy costs, and extend the life of your unit.
If you’ve noticed any of the signs in this article — or simply want peace of mind for the months ahead — now is the perfect time to book your winter service.
Get in touch with INS Air Conditioning today to arrange a visit or request a free quote.






















