Refrigerator condenser coil and greenhouse: what they have in common

1. Step 1. Refrigerator condenser coil — is part of — Freezer. It gives off heat to the outside.
2. Step 2. Freezer — has part — Thermal insulation. Polyurethane foam in the walls.
3. Step 3. Thermal insulation — is used in — Double glazing. An air gap.
4. Step 4. Double glazing — has part — Window glass. Two panes.
5. Step 5. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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