Sec. 1. 10 MRSA §1413, sub-§1, as amended by PL 1989, c. 75, §1, is further amended to read:

1. ASHRAE. "ASHRAE 90" means the current standard for energy conservation in new building design developed and approved by the American Society of Heating, Refrigeration Refrigerating and Air Conditioning Air-Conditioning Engineers, Inc.

Sec. 2. 10 MRSA §1413, sub-§§1-A and 1-B are enacted to read:

1-A.__ASHRAE Standard 62-2001.__"ASHRAE Standard 62-2001" means Ventilation for Acceptable IAQ, ASHRAE Standard 62-2001, the standard for building ventilation adopted by ASHRAE in 2001.

1-B.__ASHRAE Standard 90.1, 2001.__"ASHRAE Standard 90.1, 2001" means Standard 90.1, 2001 Energy Standard for Buildings, IP Edition, the standard for energy conservation in new building design adopted by ASHRAE in 2001.

Sec. 3. 10 MRSA §1415-C, first ¶, as enacted by PL 1991, c. 246, §6, is amended to read:

Except as provided in this section, any new conditioned space in a residential building constructed after January 1, 1989 2003 must conform to the minimum prescriptive or performance standards established in this section.

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 2003, 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