Group 1: Air Conditioner Selection - The size of the air conditioner should be determined based on the room area, with different power ratings (in HP) corresponding to specific cooling capacities [1] - A reference table is provided to match the appropriate HP with the room size to avoid over or under-sizing the air conditioner [1] Group 2: Energy Efficiency - Understanding energy efficiency labels is crucial for evaluating air conditioners, which indicate energy consumption and efficiency levels [2] - Energy efficiency is categorized into five levels, with Level 1 being the most efficient and Level 5 being the minimum standard for market entry [4] - The APF (Annual Energy Consumption Efficiency) value and CC (Rated Cooling Capacity) are important metrics for assessing energy savings [6] Group 3: Inverter vs. Non-Inverter - Inverter air conditioners are recommended due to their superior cooling speed, precise temperature control, lower noise levels, and energy efficiency compared to non-inverter models [7][9] - Non-inverter models have less accurate temperature control and higher noise levels, making them less comfortable for users [9] Group 4: Air Conditioner Lifespan and Replacement - The recommended lifespan for air conditioners is 8 to 10 years, and consumers are advised to replace them before they fail [10] - The government offers a "national subsidy" policy for replacing old air conditioners, with significant funding allocated for consumer incentives [11][14] - Consumers can receive subsidies based on the energy efficiency level of the new appliances, with specific limits on the amount per item [14]

Group 1 - The core viewpoint of the news highlights the active performance of the non-ferrous metal sector, particularly the non-ferrous metal leader ETF (159876), which saw a price increase of 0.51% on July 10, with significant gains in constituent stocks such as Northern Rare Earth and China Aluminum [1][3] - Trump's announcement of a 50% tariff on copper imports aims to shift copper production back to the U.S., which is expected to impact global copper prices and supply dynamics significantly [3] - Northern Rare Earth is projected to achieve a net profit of 900 million to 960 million yuan for the first half of 2025, representing a year-on-year increase of 1882.54% to 2014.71% [4] Group 2 - The non-ferrous metal industry is anticipated to experience a turning point in supply and demand dynamics, driven by increasing demand from sectors such as electric vehicles and consumer electronics [4] - The allocation of weights in the non-ferrous metal leader ETF includes copper (26.1%), gold (16.3%), aluminum (15.8%), rare earths (8.5%), and lithium (7.7%), which helps in diversifying investment risks [6] - The current valuation of the non-ferrous metal index is relatively low, with a price-to-book ratio of 2.24, indicating a favorable investment opportunity [4]