(1) This link provides NYCDOB “Tips” on window AC installations, http://www.nyc.gov/html/dob/downloads/pdf/ac_tips.pdf , NOTE: it states that “a work permit or equipment use permit is generally not required for the installation of a common window A/C unit, unless the unit exceeds three tons/36,000 BTU/hr. See section 27-184 (a) of the Building Code (found online under the Reference Materials link at www.NYC.gov/buildings) for more details.” Further, it includes “make sure the unit is installed securely. Support the A/C unit from underneath or firmly fasten it from inside with angles. Metal brackets, mounting rails, etc. may be used for a safe installation.”
(2) If the building’s height requires Local Law 11/98 Inspections, http://www.nyc.gov/html/dob/downloads/pdf/locallaw_1998_package.pdf , { excerpted: “(3) Report requirements.(i) The professional shall …..a written report….. clearly documenting all conditions not classified as safe …. (ii) The report shall include: …..(G) all conditions including …., and the deleterious effect of exterior appurtenances, including ….. window air conditioners, flower boxes, etc. The report shall classify each such condition as safe, unsafe or safe…..”}.
(3) In my experience, most, not all, LL 11/98 filing engineers consider window a/c brackets to be an integral part of considering the unit safe; without a properly secured bracket, they do not. LL 11/98 covers all facades, street AND none street elevations. Where prudence mattered, client-boards adopted a house rule (and alteration agreement addendum), in accordance with the NYCDOB Tips, above. (T1)