Materials vary across different components of an air conditioner, with significant differences between core parts and the outer casings:
Core Heat Exchange Components
The tubing for evaporators and condensers predominantly uses pure copper, which offers high thermal conductivity and strong corrosion resistance, ensuring a normal service life of 15–20 years. Some entry-level models utilize aluminum or copper-clad aluminum to reduce costs, though these are prone to corrosion and leakage over long-term use.
Indoor and Outdoor Unit Casings
Indoor unit casings typically use ABS engineering plastics or modified PP, which are impact-resistant and resistant to oxidation and yellowing; high-end models may employ PC/ABS alloys for enhanced weather resistance. Outdoor unit casings generally consist of cold-pressed steel sheets with a protective coating, though some use weather-resistant modified PP capable of withstanding temperatures as low as -40°C.
Other Key Components
Drainage trays often utilize synthetic rubbers such as EPDM, while cooling water pipes may be made of PVC, PEX, or metals like copper and stainless steel. Compressor and fan motor windings are typically made of pure copper, offering excellent electrical conductivity and low heat generation.