Economic Importance for Humans: Negative
Some species of swift have learned to take advantage of man-made structures as nest sites. For example chimney swifts (Chaetura pelagica) as their name suggests, often nest inside chimneys. This causes problems for those who wish to keep the swifts out, and has led some to cap their chimneys in order to exclude the birds. Generally swifts do not damage the structures, but where they are unwanted, time and money must be spent to keep them out.
Negative Impacts: household pest