Ameresco Inc., a Framingham company that designs and installs systems to cut energy and maintenance costs, reported that second-quarter net income was $5.2 million, compared with $8.8 million for the same period a year earlier, a drop of 41.5 percent.

Second-quarter revenue was $164.1 million, versus $165.5 million a year before.

The company was “disappointed by the pace of converting awarded projects to signed contracts in a few segments,” chief executive George P. Sakellaris said in a statement.

Ameresco has lowered its full-year earnings and revenue guidance as a result.

For its fiscal 2012, the company said that it now expects­ total revenue to be in the range of $695 million to $730 million, and net income to be $32 million to $35 ­million.