Air conditioner and boiler: what they have in common

1. Step 1. Air conditioner — uses — Vapour-compression cycle. The vapour-compression cycle.
2. Step 2. Vapour-compression cycle — uses — Latent heat. The evaporation of the refrigerant produces cold.
3. Step 3. Latent heat — is used in — Boiler. Evaporation needs latent heat.

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