Live plants and trees in offices and large atriums not only improve moods of those working, however they also save money and energy by naturally filtering the air and balancing the temperature (thus saving money on temperature control). Many large hotels use plants in the center atrium of the hotel, as the upper levels can become very warm, even with the air conditioning working its hardest. The plants can also maintain relative humidity in both large and small spaces. The cost of buying plants for federal buildings is incomparable to the cost of energy that will go unused because of this addition.
Idea No. 13226