How an Air Conditioner Works

A clever machine that simply moves the room's heat outside

A plain-language explainer (a sample technical document)

Created by Nagi

※ Best viewed on a desktop — slides may be hard to read on mobile.

Portfolio sample / general-audience demo
Technical Explainer — Portfolio Sample

1. What is it actually doing?

  • An air conditioner doesn't really "make cold" — it moves the room's heat outside.
  • The heat is carried by a refrigerant, a substance that switches between liquid and gas.
  • It keeps repeating: absorb the room's heat → release it outside.
  • That's why the outdoor unit blows out warm air.
Portfolio sample / general-audience demo
Portfolio sample / general-audience demo
Portfolio sample / general-audience demo
Technical Explainer — Portfolio Sample

4. Main parts and their roles

Part Role (in plain terms)
Compressor A pump that squeezes the refrigerant to keep it circulating — the "heart" (inside the outdoor unit)
Outdoor coil (condenser) Releases the heat the refrigerant carried into the outside air
Expansion valve Drops the pressure sharply, making the refrigerant cold
Indoor coil (evaporator) Lets the refrigerant absorb the room's heat and blows out cool air
Fan Moves air across the coils to help heat flow in and out
Portfolio sample / general-audience demo
Technical Explainer — Portfolio Sample

5. Good to know

Point Why it matters
It heats, too Reverse the refrigerant flow and it carries outside heat into the room (a heat pump)
Key to efficiency An inverter fine-tunes the compressor's speed to cut wasted electricity
Clean the filter Dust clogs the airflow, weakening performance and raising your bill
Don't overshoot Setting the temperature too low or too high uses far more power
Portfolio sample / general-audience demo
Technical Explainer — Portfolio Sample

6. Mini glossary

  • Refrigerant — a substance that switches between liquid and gas to carry heat
  • Compressor — a pump that squeezes the refrigerant to circulate it
  • Heat exchanger — a part where the refrigerant and air trade heat (in both units)
  • Condenser / Evaporator — the heat exchanger that releases heat / the one that absorbs it
  • Expansion valve — a valve that lowers pressure to cool the refrigerant
  • Heat pump — a mechanism that "pumps" heat from one place to another (used for heating)
Portfolio sample / general-audience demo

In short

An air conditioner simply moves the room's heat outside.

Compress → release → expand → absorb, on repeat —
cool in summer, and reverse it for warmth in winter.

Portfolio sample / general-audience demo