3. The Act respecting the conservation of energy in building (chapter E-1.1) and this Regulation apply to the design and construction of buildings, except for:(1) building or parts thereof whose design energy load, other than manufacturing and processing operations, is less than 10 W/m2 of floor area;
(2) horticultural, silvicultural and botanical greenhouses, and greenhouses used for research;
(3) public buildings or parts thereof which are not intended to be heated during winter.