On a smaller scale, an integrated controls system installed at the six-sto- ry First National Bank in Huntsville, Tex., has reduced yearly energy costs by S30,000, with a payback. Overland Park, Kan., a similar installation has saved Humana hospital s98 000 a year, an amount that will also be 0 paid back in 2.5 years. In Houston the public library system reduced its utility bills by 31 percent and so saved about S500,000 a year, with a payback period of three years. The capital made avail able as a result of these retrofits can meet more important needs such as