If your air conditioner is blowing warm air, it might be time for a gas top up. There are a few reasons why your Aircon unit might need a gas top up. One reason is that over time, refrigerants can leak out of your Aircon unit. This is why it’s important to have your Aircon unit serviced regularly. Another reason for a gas might be that your Aircon is not cooling as well as it used to. This could be because it’s low on refrigerant.