HVAC units need refrigerant. Your unit will suffer major problems without proper refrigerant levels. The compressor and evaporator coils freeze up without refrigerant. The air cannot be cooled without refrigerant, so your system will not work properly. When your unit has a leak, refrigerant seeps out, and your HVAC unit stops cooling the air. This is an issue that must be repaired and will not get better on its own. In fact, addressing the issue quickly can help avoid other damage to your unit. The biggest sign that your HVAC unit has an issue is when your home is no longer at the temperature you desire. During warm weather when your AC unit is running but not cooling your home, it’s a sign that your unit is leaking refrigerant. If your HVAC unit freezes, there is a problem. If your evaporator coils are frozen, your system is leaking refrigerant. Your system will freeze if the refrigerant doesn’t work with the evaporator coils. When your air conditioning unit is running, but the air is warm, it could be leaking refrigerant. It’s also why your home doesn’t feel cool. Your HVAC unit cannot cool the air without refrigerant, so warm air flows through it. About 50% of home energy is used by the HVAC system. If you notice an increase in your home’s energy bill, it’s likely a result of a problem with your HVAC system. Your HVAC unit should not make weird noises. If loud, crackling, bubbling or banging noises start to occur, that’s a sign of a problem. When you hear abnormal sounds from your HVAC unit, turn it off immediately. Continuing to run your unit could cause more damage. Your unit won’t produce cool air if the refrigerant leaks. At that point, you shouldn’t keep your unit on.