(1) The following capital investments are those that exclusively qualify for the conservation of energy credit for tax year 2008:

(a) insulation in existing buildings of floors, walls, ceilings, and roofs;

(b) insulation in new construction of floors, walls, ceilings, and roofs, to the extent it exceeds the requirements of the IECC with Montana amendments;

(c) insulation of pipes and ducts located in nonheated areas and of hot-water heaters and tanks;

(d) windows that result in reduction of energy consumption;

(e) storm doors;

(f) insulated exterior doors;

(g) caulking and weather stripping;

(h) devices which limit the flow of hot-water from shower heads and lavatories;

(i) waste heat recovery devices;

(j) glass fireplace doors;

(k) exhaust fans used to reduce air conditioning requirements;

(l) replacement of incandescent light fixtures with light fixtures of a more efficient type such as those with electronic ballast and compact or linear fluorescent lamps and LED lights;

(m) lighting controls with cutoff switches to permit selective use of lights;

(n) programmable thermostats; and

(o) installation of new domestic water heaters, heating or cooling systems, so long as the replacement or installation of the new system reduces the waste or dissipation of energy, or reduces the amount of energy required.

(2) If the new system described in (1)(o) differs in style or type from the previous system, such as, if one or more window air-conditioning units is replaced with a central air system, the new system must exceed the requirement in ARM 42.4.206(1)(c). If the replacement system exceeds the established standards, only the additional cost shall be considered when computing the credit.