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Energy-saving tip number 3
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Fill containers with water and keep them inside the living space for thermal mass. This will dampen the temperature swings so your heating/cooling system will use less energy.
You can use water bottles or a plant aquarium... anything with water. You can even store it inside a buffet or dresser.
It's best to have it near the center of the living space away from exterior walls, but somewhere where it can absorb the heat of the day. The amount varies, but a good estimate is about 3-6 liters per square meter of living space.
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pics mediawiki commons; File:Buffet d'angle polychrome-Musée alsacien de Strasbourg (1).jpg, File:Water bottles - Su şiseleri.jpg, File:Waterfall (2914716743).jpg (CC-BY-SA-4.0 and CC-BY-2.0)
@Pat have you tied pouring hot water in plastic bottles? They shrink.
As the water cools down to room temp, it contracts, taking less volume.
If the water is very hot (> ~75C) the PET thermoplastic of the bottle will shrivel up, so don't try that.
You can just fill them with room-temperature water and it will work just fine.
