New Delhi, May 22 -- Summer in north and central India is forcing a rethink about home cooling. The India Meteorological Department has warned of continuing heatwave conditions, with Delhi-NCR seeing temperatures above 45-degree C. When heat becomes daily reality, a purchase decision shifts from "nice to have" to "necessary." That makes it worth comparing two common choices: evaporative air coolers and air conditioners. Both lower temperature, but they do it in different ways, and those differences determine which one works better for a given home, room, or budget.

A cooler can be the better buy when you live in a dry city, keep windows open, and need cooling for a bedroom, hall, shop, or semi-open space. It also makes sense when you wan...