Figure 10 - How fluctuation in atmospheric temperature varies demand for house heating.

The curve represents heating demand and is merely a typical minimum atmospheric temperature record plotted up side down with zero near the top so that a degrease in temperature will show the resulting increase in demand for heating.

The greatest demand for heat is at the high point or "peak" of the curve, hence this is called "peak load."

Single house heating service is not required until the atmospheric temperature goes below about 60°, the shaded area between 60° and the atmospheric temperature curve represents the house heating load.


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