The American Institute of Architects at its recent annual convention in Cincinnati raised its dues, changed its code of ethics from mandatory to voluntary, pledged $30,000 to educate architects about energy conservation, decided that just about anyone can be an affiliate AIA member and elected new officers.

Next January, AIA national dues will jump from $55 to $70 a year for first-year members, from $80 to $95 for second-year members and from $105 to $140 for other members.

Supplemental dues paid by firms will increase from $155 to $160 for each registered architect employed by the firm in question.

Delegates from throughout the nation voted 1,280 to 801 to accept "a system of voluntary standards over a mandatory statement of ethical principles."

The vote changed the AIA's formerly mandatory code of ethics and professional conduct from a directive to a guideline. "It will be the responsibility of individual members to decide for themselves whether to abide by those principles," an AIA spokesman said.

Among principles about which members will now have to decide for themselves are the use of misleading advertising, accurate representation of professional qualifications, avoidance of conflict of interest and use of contributions as a method for gaining work, an institute official said.

In other business, AIA directors authorized withdrawal of $30,000 from the institute's reserve fund to support "comprehensive educational programs" to teach architects more about designing energy-efficient buildings.

"The (program) will be designed to reach the nation's entire architectural profession through a diversity of continuing educational programs," an AIA spokesman said.

Delegates voted to open the AIA affiliate membership category to almost anyone chapter members want to include. They made eligible all persons a "chapter believes will provide a meaningful contribution by virtue of their employment or profession, and are not otherwise eligible for AIA membership."

This year's AIA first vice president, R. Randall Vosbeck, of the VVKR Partnership, Alexandria, Va., will automatically become president of the institute on Jan. 1, 1981.