Sec. 4. 10 MRSA §1415-C, sub-§3, as amended by PL 1991, c. 246, §9, is further amended to read:

3. Multifamily structures. Effective January 1, 1990 2004, in addition to conforming to the requirements of this section, any new construction or renovation of a conditioned space in a any residential building of more than 2 dwelling units must conform to the ASHRAE 90 standards, provided that those standards do not conflict with this section Standard 62-2001 and ASHRAE Standard 90.1, 2001.

Sec. 5. 10 MRSA §1415-D, first ¶, as enacted by PL 1987, c. 818, §4, is amended to read:

Except as provided in this section, new construction or substantial renovation of any commercial or institutional building undertaken after January 1, 1989 shall 2004 must conform to the ASHRAE 90 standards Standard 62-2001 and ASHRAE Standard 90.1-2001 under any of the compliance methods specified in the standards. For the purpose of this section, "substantial renovation" means any renovation for which the cost exceeds 50% of the building's current value prior to renovation.