Tech

With temperatures soaring high in India, the demand for air conditioners (ACs) has never been higher. These home appliances can bring some much-needed relief from the scorching heat. There are ample options from a vast range of brands available in the market when it comes to ACs, but choosing the right unit for your home can be a hassle with various factors coming into play. The size of the room, tonnage requirement, budget, and the space available to install the unit must be considered when purchasing an AC.

For smaller rooms, a window AC can be a compelling option due to the ease of installation, lower maintenance costs, and portability.

Features to Look For When Buying A Window AC

To help you make an informed purchase, we have curated a list of the best window ACs under Rs 30,000 in India.

Voltas 1.5 Ton 3 Star Turbo Mode Window AC

Voltas is considered one of the more reliable brands in India’s AC market. This model, launched in 2025, has a 1.5 ton capacity, an Energy Rating of 3 star, and a 4,750W cooling capacity. Its Turbo Mode is designed to quickly cool down a room even in soaring temperatures, while the Filter Clean Indicator and Low Gas Diagnosis features inform users when the AC requires regular maintenance.

The Voltas 1.5 Ton 3 Star, Turbo Mode Window AC has a Copper condenser coil with anti-rust coating for prolonged durability. The window AC is also said to have an “Ultra Silent” operation.

Godrej 1.5 Ton 3 Star Fixed Speed Window AC

The Godrej 1.5 Ton 3 Star Fixed Speed Window AC can be purchased as an alternative to the aforementioned Voltas AC. It carries a self-diagnosis feature which alerts the user in case of any issues with the unit. Godrej has equipped this window AC with a Copper condenser coil with a Blue Fin Anti-Corrosion coating for durability.

Meanwhile, its Pure Air Filter is claimed to remove dander, dust particles, and odour to provide clean air. The AC has a 3 star Energy Rating and promises a stabiliser-free operation.

Lloyd 1.5 Ton 3 Star Fixed Speed Window AC

A more affordable option in the AC market is the Lloyd 1.5 Ton 3 Star Fixed Speed Window AC. It comes with Blue Fins Copper Coils and its non-inverter compressor is claimed to work in temperatures up to 48-degree Celsius. The AC has Clean Air Filter and self-diagnosis functions to minimise any issues during operation.

The auto-restart feature in the window AC ensures the unit turns on automatically in case of power cuts.

Carrier 1 Ton 3 Star Window Fixed Speed AC

For smaller rooms, the Carrier 1 Ton 3 Star Window Fixed Speed AC can be a compelling purchase. It comes with Aqua Clear Protection which prevents the accumulation of water and moisture in the unit. Meanwhile, Carrier claims its Hydro Blue Coating protects the condenser fins from corrosion by humidity and salts present in the air.

The Carrier 1 Ton 3 Star Window Fixed Speed AC has a 3 star Energy Rating and features an Active Carbon filter that eliminates pet odour, smoke, and paints from air.

Haier 1 Ton 3 Star Fix Speed Side Flow Window AC

The Haier 1 Ton 3 Star Fix Speed Side Flow Window AC comes with a Turbo Cool which is advertised to cool the room faster. The company says it can operate in temperatures up to 54-degree Celsius. The window AC has a grooved Copper condenser coil and a “Hyper PCB” made with thicker conformal and FR4 flame resistance material.

The Super Micro Antibacterial filter on the Haier window AC is claimed to trap bad odours, smoke, and harmful airborne chemicals in the air.

Researchers at Australia’s CSIRO have achieved a world-first demonstration of quantum machine learning in semiconductor fabrication. The quantum-enhanced model outperformed conventional AI methods and could reshape how microchips are designed. The team focused on modeling a crucial—but hard to predict—property called “Ohmic contact” resistance, which measures how easily current flows where metal meets a semiconductor.

They analysed 159 experimental samples from advanced gallium nitride (GaN) transistors (known for high power/high-frequency performance). By combining a quantum processing layer with a final classical regression step, the model extracted subtle patterns that traditional approaches had missed.

Tackling a difficult design problem

According to the study, the CSIRO researchers first encoded many fabrication variables (like gas mixtures and annealing times) per device and used principal component analysis (PCA) to shrink 37 parameters down to the five most important ones. Professor Muhammad Usman – who led the study – explains they did this because “the quantum computers that we currently have very limited capabilities”.

Classical machine learning, by contrast, can struggle when data are scarce or relationships are nonlinear. By focusing on these key variables, the team made the problem manageable for today’s quantum hardware.

A quantum kernel approach

To model the data, the team built a custom Quantum Kernel-Aligned Regressor (QKAR) architecture. Each sample’s five key parameters were mapped into a five-qubit quantum state (using a Pauli-Z feature map), enabling a quantum kernel layer to capture complex correlations.

The output of this quantum layer was then fed into a standard learning algorithm that identified which manufacturing parameters mattered most. As Usman says, this combined quantum–classical model pinpoints which fabrication steps to tune for optimal device performance.

In tests, the QKAR model beat seven top classical algorithms on the same task. It required only five qubits, making it feasible on today’s quantum machines. CSIRO’s Dr. Zeheng Wang notes that the quantum method found patterns classical models might miss in high-dimensional, small-data problems.

To validate the approach, the team fabricated new GaN devices using the model’s guidance; these chips showed improved performance. This confirmed that the quantum-assisted design generalized beyond its training data.

Researchers have found that a metamaterial, a stack of InGaAs semiconductor layers, can emit significantly more mid-infrared radiation than it absorbs. When this sample was heated (~540 K) in a 5-tesla magnetic field, it exhibited a record nonreciprocity of 0.43 (about twice the previous best). In other words, it strongly violates Kirchhoff’s law and forces heat to flow one way. This demonstration of strong nonreciprocal thermal emission could enable devices like one-way thermal diodes and improve technologies like solar thermophotovoltaics and heat management.

According to the published study, the new device is made from five ultra-thin layers of a semiconductor called indium gallium arsenide, each 440 nanometers thick. The layers were gradually doped with more electrons as they went deeper and were placed on a silicon base. The researchers then heated the material to about 512°F and applied a strong magnetic field of 5 teslas. Under these conditions, the material emitted 43% more infrared light in one direction than it absorbed—a strong sign of nonreciprocity. This effect was about twice as strong as in earlier studies and worked across many angles and infrared wavelengths (13 to 23 microns).

By providing a one-way flow of heat, the metamaterial would serve as a thermal transistor or diode. It could enhance solar thermophotovoltaics by sending waste heat to energy-harvesting cells and aid in controlling heat in sensing and electronics. It has potential implications for energy harvesting, thermal control, and new heat devices

Challenging Thermal Symmetry

Kirchhoff’s law of thermal radiation (1860) states that at thermal equilibrium, a material’s emissivity equals its absorptivity at each wavelength and angle. Practically, this reciprocity means a surface that strongly emits infrared will absorb it equally well.

Breaking this symmetry requires violating time-reversal symmetry, such as by applying a magnetic field to a magneto-optical material. For example, a 2023 study showed that a single layer of indium arsenide (InAs) in a ~1 T magnetic field could produce nonreciprocal thermal emission. However, that effect was extremely weak and worked only at specific wavelengths and angles. Till now, magneto-optical designs have achieved only tiny emission–absorption imbalances under very restrictive conditions. The new achievement demonstrates that man-made materials can produce one-way thermal emitters.

The tropospheric mission of NASA was launched in 2023 to monitor pollution. It was abbreviated as TEMPO and has revolutionised the scientists’ observation of the air quality from space. It was located around 22,000 miles above the Earth, and it uses a spectrometer to collect daytime air quality data on an hourly basis over North America. It covers small areas within a few square miles and significantly advances technologies, offering only one-time readings per day. This mission was successful within 20 months at its prime phase from June 19, 2025, and is now extended till September 2026 because of the exceptional quality of the data.

TEMPO Tracks the Air Quality

As per NASA, TEMPO keeps a track of the pollutants such as nitrogen oxides, formaldehyde, and ozone in the troposphere, which is the lowest atmospheric layer. This layer gets triggered by the power plants, vehicle emissions, dust, smog, and wildfire smoke. It gives hourly data rather than once a day, said Laura Judd, a researcher at NASA. Through this, we get to know about the emissions change over time. Further, how to monitor smog in the city or wildfire smoke. Such a real-life incident helps astronomers understand the evolution of air pollution in detail.

The major milestone during this mission was to get sub-three-hour data, which allows quicker air quality alerts. This enhances the decision-making and helps the first responders, said the lead data scientist at NASA’s Atmospheric Science Data Centre, Hazem Mahmoud. With over 800 users, TEMPO has passed two petabytes of data downloads in a year. It proves the immense value of the health researchers and air quality forecasters.

NASA’s Collaboration with NOAA and SAO

NASA worked together with NOAA and the Smithsonian Astrophysical Observatory, the former producing the aerosol products for distinguishing smoke from dust and analysing the concentration. As per Xiong Liu, the principal investigator, these datasets enhance the forecast of pollution, improve the models, and support public alerts at the time of peak emissions.

NASA’s Earth Venture Instrument program is running the TEMPO mission and a global constellation of air monitors, along with GEMS of South Korea and Sentinel-4 of ESA. The formal mission review this and evaluate the progress, inform future space-based air quality efforts, and be helpful in refining the goals.

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