What are the common refrigerants used in HVAC systems?

Common refrigerants include R-22, R-410A, and R-134a. R-22 is being phased out due to environmental concerns, while R-410A is a common replacement in newer systems.

How does a typical residential split-system air conditioner operate?

A split-system AC uses an indoor unit (evaporator coil and blower) and an outdoor unit (condenser coil and compressor). Refrigerant circulates between these units, absorbing heat indoors and releasing it outdoors.

What is the purpose of a TXV (Thermostatic Expansion Valve) in an HVAC system?

The TXV regulates the flow of liquid refrigerant into the evaporator coil, ensuring optimal superheat and efficient heat exchange.

What is the difference between SEER and EER ratings?

SEER (Seasonal Energy Efficiency Ratio) measures efficiency over an entire cooling season, while EER (Energy Efficiency Ratio) measures efficiency at a specific operating condition (95°F outdoor, 80°F indoor).

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