When was air conditioning invented

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Last updated: April 17, 2026

Quick Answer: Modern air conditioning was invented in 1902 by Willis Carrier, who developed the first electrical cooling unit to control humidity in a Brooklyn printing plant.

Key Facts

Willis Carrier invented the first modern electrical air conditioning system in 1902
The first air conditioner was installed at the Sackett-Wilhelms Lithographing & Publishing Company in Brooklyn
Carrier’s design used chilled water coils to lower humidity and temperature
Residential air conditioning became widely available in the 1950s
By 2020, over 1.6 billion air conditioning units were in use worldwide

Overview

Modern air conditioning was invented in 1902 by engineer Willis Carrier, who designed a system to solve a humidity problem at a printing plant in Brooklyn, New York. His invention not only cooled the air but also controlled humidity, laying the foundation for modern climate control in buildings.

Initially developed for industrial use, air conditioning technology evolved over the 20th century to become a staple in homes, offices, and vehicles. The invention revolutionized architecture, urban development, and public health, especially in hot climates.

1902: Willis Carrier designed the first electrical air conditioning unit to stabilize temperature and humidity at a Brooklyn printing plant.
1906: The term 'air conditioning' was first used by Stuart Cramer in a patent for textile mill humidity control.
1925: The Rivoli Theater in New York City became one of the first public spaces to install air conditioning, boosting summer movie attendance.
1939: General Motors introduced air conditioning in automobiles, marking the beginning of mobile cooling systems.
1950s: Mass production of window units made residential air conditioning affordable and widespread in the United States.

How It Works

Air conditioning systems rely on thermodynamic principles to remove heat and humidity from indoor spaces. The process involves a refrigerant cycle that absorbs heat from indoor air and releases it outside.

Refrigerant: A chemical compound, such as R-410A, circulates through the system, absorbing and releasing heat as it changes between liquid and gas states.
Evaporator Coil: Located indoors, this coil contains cold refrigerant that absorbs heat from room air, cooling it before recirculation.
Compressor: This component pressurizes the refrigerant gas, raising its temperature before it moves to the condenser.
Condenser Coil: Situated outdoors, it releases the absorbed heat into the external environment as the refrigerant condenses.
Expansion Valve: Regulates refrigerant flow into the evaporator, reducing pressure and temperature for efficient cooling.
Blower Fan: Circulates indoor air over the evaporator coil, distributing cooled air through ducts or directly into the room.

Comparison at a Glance

Below is a comparison of major air conditioning types based on efficiency, cost, and application:

Type	SEER Rating	Installation Cost	Best For	Lifespan
Central AC	13–21	$3,000–$7,000	Whole-house cooling	15–20 years
Window Unit	10–15	$150–$800	Single rooms	8–10 years
Portable AC	8–12	$300–$900	Renters, temporary use	5–7 years
Ductless Mini-Split	16–30	$2,000–$14,500	Zoned cooling, no ducts	15–20 years
Geothermal Heat Pump	20–30	$10,000–$25,000	Energy-efficient homes	20–25 years

While central systems dominate new home construction, mini-split systems are gaining popularity due to their high efficiency and zoning capabilities. The choice often depends on climate, budget, and building structure.

Why It Matters

Air conditioning has had a profound impact on human productivity, health, and urban development. It enables comfortable living in extreme climates and supports critical infrastructure like hospitals and data centers.

Public Health: Reduces heat-related illnesses, especially in vulnerable populations during heatwaves.
Workplace Productivity: Studies show a 10–15% increase in cognitive performance in cooled environments.
Urban Growth: Enabled the expansion of cities in hot regions like Phoenix, Dubai, and Singapore.
Global Energy Use: Air conditioning accounts for nearly 10% of global electricity consumption.
Climate Impact: Refrigerants like HFCs contribute to global warming, prompting regulations to phase them out.
Equity Issues: Access to cooling remains limited in low-income and developing regions, raising concerns about climate justice.

As global temperatures rise, air conditioning will remain essential, but innovation in energy efficiency and sustainable refrigerants is critical for long-term viability.