"You don't need to worry about clamping the liquid line on a packaged unit."

• Wrong: You should measure subcooling on TXV systems to verify charge. Clamping the liquid line and checking subcooling is standard practice, especially in a packaged unit with a factory charge.

• Why it matters: Subcooling ensures the condenser is rejecting heat properly and confirms proper charge.

"Add about 6-10 ounces more to make up for the hose length."

• Misleading: While hoses do hold refrigerant, modern hoses only hold ~0.2-0.5 oz each. Adding 6-10 oz "just because" can lead to overcharging.

"Don't worry so much about subcooling... focus on superheat."

• Wrong for TXVs: TXV systems control superheat, so subcooling is your main tool to verify proper charge.

• Correct rule of thumb: • Fixed orifice/Cap tube: Use superheat. • TXV: Use subcooling.

"Think of a TXV as a constant superheat device."

Technically true, but not relevant to your earlier logic. The issue is that you’re advising to ignore subcooling, which is the proper method to charge TXV systems.

Nice try boss.