Following domestic ACs are widely used - 1. Window AC (0.75 TR, 01 TR, 1.5 TR, 2 TR), 2. Split AC (0.75 TR, 01 TR, 1.5 TR, 2 TR). These ACs required regular maintenance and services to get optimum efficiency as its filter and fins get choked of dusts. AC servicing must be done through trained professionals and registered agencies.