On May 29, an automatic weather station in Delhi recorded an unprecedented maximum temperature of 52.9 degrees Celsius, marking the highest temperature ever recorded in the capital. However, the India Meteorological Department (IMD) has expressed caution over this figure, suggesting that it may be due to “an error in sensor or local factors,” as the reading is significantly higher than other recordings in the area. The IMD is currently examining the data and sensors to verify the accuracy of this record.
Meanwhile, large parts of north and central India continue to endure a severe heatwave. Temperatures in parts of Rajasthan and Haryana have also soared, exceeding 50 degrees Celsius. For some context, water boils at 100 degrees Celsius, so we are already half way there.
The sizzling heat has led to the closure of schools in several cities as authorities aim to protect children from the dangerous conditions. Additionally, the extreme temperatures have significantly increased the risk of heatstrokes for individuals working outdoors, posing a serious health threat across affected regions.
For those who can afford them, air conditioners (ACs) have become an essential appliance in homes, offices, and various other settings, amid the heat wave crisis. Having said that, their care and protection has never been more important considering how we’re hearing news of compressors exploding, raising concerns of their own. So while an AC can definitely help you get some respite, you also have to be smart enough to use it in a manner that it doesn’t make you sweat elsewhere.
How do air conditioners (AC) work — explained
Air conditioners operate by cycling refrigerant through a series of components to cool indoor air. The process begins in the evaporator, located inside the unit, where the refrigerant absorbs heat from the indoor air and evaporates, turning into a gas. This phase change draws heat out of the air, cooling it, and fans then blow this cooled air back into the room.
The gaseous refrigerant flows to the compressor, usually outside, which pressurises it, raising its temperature. The hot, high-pressure gas moves to the condenser, also outside, where it releases its heat to the air and condenses back into a liquid. Condenser fins and fans help expel this heat.
Finally, the liquid refrigerant passes through an expansion valve or capillary tube, reducing its pressure and cooling it further. It then re-enters the evaporator, repeating the cycle.
Modern air conditioners are designed with energy efficiency in mind. Many units now come with features such as inverter technology, which adjusts the compressor speed to maintain a constant temperature, reducing energy usage. The Bureau of Energy Efficiency (BEE) star ratings in India grade electrical appliances’ energy efficiency on a five-star scale. Higher star ratings indicate greater energy efficiency, helping consumers easily understand a product’s energy consumption and its potential impact on electricity bills.
Air conditioner (AC) maintenance — step-by-step guide
Proper maintenance of your air conditioner (AC) ensures it operates efficiently, prolongs its lifespan, and keeps your electricity bills in check.
- Check the air filters monthly and clean or replace them every 1-3 months, depending on usage and filter type.
- Clean the evaporator and condenser coils annually or more often if the AC is in a dusty environment.
- Check and straighten the fins on the evaporator and condenser coils. This helps maintain proper airflow through the coils.
- Ensure the condensate drain is not clogged to prevent water damage and high humidity levels. Clear blockages, if any.
- Schedule professional maintenance at least once a year, preferably before the cooling season starts.
- Pay attention to unusual noises, reduced cooling performance, or increased energy bills. These can be signs of issues that need professional attention.
How to use air conditioners (AC) effectively in heat wave — to-do-list
- Set your thermostat to the highest comfortable temperature. A lower setting increases the compressor’s runtime, consuming more electricity and raising electricity bills. Therefore, a higher setting like 25 degree Celsius when you’re at home and need cooling is recommended. Alternatively, you can use programmable or smart thermostats to adjust the temperature automatically based on your schedule, ensuring efficiency and comfort.
- Use the AC fan mode to circulate air without cooling continuously. Ceiling fans or portable fans can also help distribute cool air more evenly. Keep doors closed to rooms that are not in use to focus the cooling on occupied spaces.
- Close curtains, blinds, or shades during the day to block out direct sunlight, reducing the indoor temperature and easing the load on your AC.
- Use zoned cooling if available, focusing the cooling power on areas where it’s most needed. Take advantage of cooler evening temperatures by turning off the AC and opening windows if it’s safe to do so.
- Use a dehumidifier to reduce humidity levels, making the air feel cooler and more comfortable without needing to lower the thermostat.
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