The downgrade to Neutral suggests that B of A Securities believes Ameresco's stock may not have as much upside potential as previously thought, which could lead to a short-term negative impact on the stock price. However, the increase in the price target to $37 implies that the firm still sees growth potential, which could mitigate any negative sentiment. The net short-term impact is likely to be neutral as the market digests both the downgrade and the increased price target.