Most people rely heavily on their air conditioning system during the summer, but we’re often asked whether it’s safe to use it when it’s cold outside. You’re unlikely to need cooling in the autumn or winter months, but what if you want to test the system, or your property suddenly becomes too warm indoors? Below, we explain the best times to use your air conditioning and how to avoid unnecessary damage.
Will My Air Conditioning Work in Cold Weather?
Air conditioning manufacturers generally advise against using the system to produce cold air when the outdoor temperature drops below around 15°C. Prolonged operation in such conditions may damage the unit, particularly the compressor. This is because air conditioning systems use a specialised lubricant typically a heavy-grade oil that is designed to perform best in warmer temperatures. When it’s cold, the oil thickens and may not lubricate the compressor effectively, potentially leading to mechanical issues.
If it’s cool outdoors and you simply want to lower the indoor temperature, opening a window is often the most practical solution. However, in colder months, most people will naturally be trying to warm up their space, not cool it down.
Many modern air conditioning units are equipped with built-in sensors that prevent the system from operating in very low temperatures. This is a safeguard designed to protect the internal components and maintain system longevity.
Can I Use the Heating Function on My Air Conditioner?
Yes—if your air conditioning unit comes with a heating function (commonly referred to as a heat pump), you can absolutely use it during colder weather. Most models make it easy to switch to heating mode via the remote control or control panel. Once activated, you can set your desired temperature and enjoy warm, comfortable air.
These systems are designed to handle a broad range of temperatures and are perfectly safe to use during autumn and winter.
When’s the Best Time to Test My Air Conditioning?
It’s advisable not to operate the cooling mode of your air conditioning when the outdoor temperature is below 15°C. The best time to test your AC unit is during spring or summer when the weather is consistently warm.
If you need to test it during the colder months—perhaps to troubleshoot a fault—wait for a milder spell where temperatures have remained above 15°C for a few days. This allows the internal oil to thin out properly and reduces the risk of ice forming on the condenser.
Alternatively, it’s best to call in a professional air conditioning technician. They’ll be able to carry out a full system check using the correct equipment, without putting your unit at risk.
Experiencing Problems With Your Air Conditioning?
If your air conditioning system isn’t working as it should, our qualified engineers at AAC are here to help. We offer free quotes and surveys, arranged at a time that suits you.
Contact us today
📧 info@aacteam.co.uk
📞 01707 32 55 66
