The answer to 'HVAC repair not heating' is that there are several common causes, including a malfunctioning thermostat, a problem with the furnace or heating system, or issues with the ductwork or air flow. Symptoms may include the system not turning on, inadequate heating, or uneven temperatures throughout the home.
Some possible solutions include checking the thermostat settings, replacing the air filter, and inspecting the furnace for any issues like a broken ignitor or malfunctioning blower motor. However, many HVAC repairs require the expertise of a professional technician, especially if the problem is with the heating system itself or the ductwork. It's generally best to call in an HVAC expert if you're not comfortable troubleshooting and repairing the system yourself.