Energy-efficient house and transformer: what they have in common

1. Step 1. Energy-efficient house — uses — Heat pump. Heating.
2. Step 2. Heat pump — is used in — Air conditioner. An air conditioner is a heat pump that carries heat out of the room.
3. Step 3. Air conditioner — is part of — Data centre. Cooling.
4. Step 4. Data centre — uses — Electrical grid. Power.
5. Step 5. Electrical grid — has part — Transformer. Transformer substations.

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