Nice to know that you can still be incompetent and do HVAC. The last three houses I lived in had HVAC problems that even I, a non-engineer, and non-certified HVAC tech, could figure out. Not a one was done right. Uneven air-flow, cold-air returns not sufficient, underpowered, overpowered and inefficient. No refrigerant.
Haven't had my caffeine yet.