The answer to 'air conditioner not heating' is that there are several common causes, including a malfunctioning heating element, thermostat issues, or problems with the air handler or compressor. Symptoms may include the AC blowing cool air instead of warm air, the unit not turning on, or the system cycling on and off repeatedly.
Some potential solutions include checking the thermostat settings, replacing the air filters, and inspecting the heating element and other components. However, for more complex issues, it's generally best to call a professional HVAC technician who can properly diagnose and repair the problem.