In 2026, the Indian summer is marked by extreme temperatures exceeding 45°C, pushing homeowners to reconsider their air conditioning options. The choice between traditional Window ACs and modern Split Inverter ACs is becoming increasingly significant. While Window ACs are cheaper and easier to install, they often consume more power and have lower efficiency ratings. The Bureau of Energy Efficiency (BEE) has updated its ISEER (Indian Seasonal Energy Efficiency Ratio) benchmarks, leading to many 2025-model 5-star ACs being downgraded to 4-star ratings. In contrast, a 5-star Split AC typically achieves an ISEER of 5.8 or higher, making it more efficient overall. Split ACs also feature inverter technology, which allows for variable compressor speeds, reducing energy consumption by up to 40%. Despite these advantages, Window ACs remain a viable option for renters due to their lower installation costs and portability. Additionally, modern Split ACs come equipped with smart features that enhance energy efficiency, such as occupancy sensors and geofencing capabilities. Ultimately, for homeowners looking for long-term savings, investing in a Split Inverter AC is advisable, while renters may find Window ACs more practical.