1. (a) Heating Group 2 systems are defined in G.S. 87-21(a)(3). Multiple units serving interconnected space and aggregating more than 15 tons are included Heating Group 2 systems in the foregoing whether or not separately ducted or controlled.

2. (b) The installation of heating and air conditioning systems or components located in single family dwellings and systems of 15 tons or less capacity in non-residential structures require Heating Group 3 license except where:

   1. (1) heat is provided by hot water or steam in a Heating Group 1 system, or
   2. (2) cooling is provided by a unitary appliance such as a window unit in which case a license is not required.

History Note: Authority G.S. 87‑18; 87‑21(a)(3);
Eff. February 1, 1976;
Readopted Eff. September 29, 1977;
Amended Eff. August 1, 2000; May 1, 1989;
Temporary Amendment Eff. August 31, 2001;
Amended Eff. January 1, 2010; August 1, 2002;
Pursuant to G.S. 150B-21.3A, rule is necessary without substantive public interest Eff. August 22, 2015.