That ‘s why land near a large body of water never gets quite as cold in the winter as land far away from the water. The stored heat in the water keeps the land around it warm.
Slowly , all winter long , heat from the water moves out into the cold air. Heat always moves that way – from a warmer place or thing to a cooler one. Once you know which way heat moves , you understand how thing get hot and how they lose heat.
Remember when the hot sand on the beach burned your feet? Heat from the sand was moving into your cooler feet
Remember when you put the pot of water on the hot cookout stove? Heat moved from the stove into the pot and heated the pot.
Then heat from the pot moved into the cool water and heated the water. Heat moved out of the water in the pot to heat the air. If you stop adding heat to the water in the pot, the water will go on giving off its heat until that water is the same temperature as the air around it.
Once you understand how heat moves into things, and out of things it is easy to see how a solar house work.