Heating, ventilation and air conditioning

Filters, vents, condensate paths, outdoor condenser coils and thermostat settings on central forced-air heating and cooling systems.

Common failure modes

• A filter left in place long past its interval
• A filter installed against the airflow arrow
• Supply or return vents blocked by furniture
• A condensate drain blocked by algae or debris
• An outdoor condenser coil packed with grass and leaves

Procedures

• How to change the air filter in a furnace or central air conditionerChanging the air filter is the one maintenance task on a central heating and cooling system that a householder can do wi

Where this stops

Anything inside the equipment cabinet, any work on a gas connection, and any handling of refrigerant is outside this repository. Those tasks need a licensed technician, and in most jurisdictions refrigerant work requires certification.