Actually the governments decree says a minimum of 27 degrees centigrade (80F) but it allows a tolerance of 2 degrees centigrade from this level before the fine is applied, therefore posing the effective limit at 25 degrees. Health care facilities are exempt from this regulation. In winter the maximum temperature allowed in public buildings will be 19 degrees (66 F). Also in this case a tolerance of 2 degrees is allowed before the fine is triggered, bringing the effective enforced temperature to 21 degrees max (70F) in winter.
The rule for now applies to public buildings only (public offices, schools, universities, etc.). Private buildings, including hotels are not included in the regulation.