The answer to 'why is my central air not heating' is that there could be several common causes, such as a problem with the thermostat, low refrigerant levels, a malfunctioning compressor, or issues with the air ducts. Symptoms may include the air blowing but not getting warm, the system not turning on at all, or the house not reaching the desired temperature.
Some potential solutions include checking the thermostat settings, inspecting the air filters, and ensuring the outdoor unit is clear of debris. However, if the issue is more complex, such as a refrigerant leak or a problem with the compressor, it's best to call a professional HVAC technician to diagnose and repair the issue properly.