The answer to 'maintenance blowing cold air' is that there are several common causes, including a clogged air filter, low refrigerant levels, or a problem with the thermostat or compressor. Symptoms can include the system blowing cold air when it should be warm, uneven cooling throughout the home, or the system cycling on and off frequently.
If the air filter is dirty, simply replace it. Low refrigerant levels or issues with the compressor or thermostat often require a professional HVAC technician to diagnose and repair. DIY homeowners should avoid attempting to service the refrigerant system, as improper handling can be dangerous. For any complex issues, it's best to call in a licensed HVAC professional to ensure the problem is properly identified and fixed.