Evaporative Cooler Calculator
Will an air cooler actually cool your room? Enter the temperature and humidity to see the cooling it can achieve — because evaporative coolers work in dry heat but fail in humidity.
Dry interior (Rajasthan) ~15–30%; humid coast (Mumbai/Chennai) ~70–90%.
An air cooler can cool down toward the wet-bulb temperature — how much depends on how dry the air is. The drier the air, the bigger the drop.
supply air ≈ 26.7°C (from 40°C) · wet-bulb 24.4°C.
The dry air makes an air cooler highly effective — cheap, low-energy cooling.
This is why an air cooler transforms a Jaipur summer but is useless in Mumbai’s monsoon — see cooler vs AC and your climate zone.
A planning estimate. It uses a standard wet-bulb approximation and a typical cooler effectiveness (~85%); real coolers vary with pad condition, airflow and water. An air cooler also adds humidity, so in already-humid air it makes the room feel worse even as the thermometer barely moves — which is exactly why the verdict turns against it as humidity rises.
Related Guides — Deep-dive reading
Air Cooler vs Air Conditioner: Which Is Right for Your Climate?
A very Indian dilemma — how an evaporative air cooler and an air conditioner actually differ, why the cooler is far cheaper to buy and run but only works in dry heat, why the AC wins in humidity, and how to choose for your city and budget.
HVAC & CoolingHVAC for Hot-Dry Climates: Where the Air Cooler Is King
In Rajasthan, interior Gujarat and the arid interiors, the dry air is a gift — evaporative cooling works brilliantly, big day-night swings reward thermal mass and night ventilation, and dust is the enemy. How to cool a hot-dry Indian home smartly and cheaply.
HVAC & CoolingHVAC Fundamentals: The Physics Behind Comfort
The ideas underneath every system — the four things HVAC actually controls (temperature, humidity, air movement and air quality), how heat moves, the difference between sensible and latent heat, and why a cooling load is more than just 'how hot it is', for the Indian climate.
HVAC & CoolingRelated Tools — You may also find these useful
AC Capacity Calculator
Find the right air-conditioner tonnage for a room — from area, sun, floor, occupancy and climate. Right-sized, not oversized.
HVACAC Installation Cost Calculator
An indicative equipment + installation budget for your home's air conditioning — by AC type, tonnage and number of units, with a realistic range.
HVACAC Running Cost Calculator
What your AC costs to run each year — from tonnage, BEE star rating, hours and tariff — plus how much a higher star rating saves.
HVAC