The energy cost to landlords and owners of apartment buildings is sometimes one of the biggest monthly expenses. From the recent and distant history and energy crisis of the world, it does not look like electricity costs will be declining any time soon either.
One easy step that all apartment buildings should consider is installing solar hot water systems for heating the water used within the respective properties.
Here is an example of a solar hot water system in use onto of a large apartment complex:

This type of renewable energy system has a very long lifespan and can cut down or entirely eliminate water heating costs right away. There are also solar federal tax credits available once this type of energy source is implemented.

As is the case with any solar system, your roof should be in good condition and also have plenty of sunlight to capture the sun’s rays everyday.