Greenhouse frame and heat pump: what they have in common

1. Step 1. Greenhouse frame — is part of — Greenhouse. A metal or wooden frame.
2. Step 2. Greenhouse — has part — Window glass. It lets light in and holds heat.
3. Step 3. Window glass — is part of — Solar panel. Tempered cover glass.
4. Step 4. Solar panel — is used in — Energy-efficient house. Solar energy.
5. Step 5. Energy-efficient house — uses — Heat pump. Heating.

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