conversion to passive heating ends
Completion of the physical alterations that refit a building or structure for passive heating.
The conversion of a building or structure to passive heating ends when the last physical alterations are completed refitting it for passive heating. The conversion process typically involves creation of an airtight shell through low u-value windows, a ventilation system with high heat recovery, and highly rated insulation.
The last physical alterations complete the conversion work. The objective remains passive heating as defined for the building, not an unspecified improvement in energy performance.
Environmental upgrade ends covers energy-efficiency projects more broadly. The passive-heating conversion begins with its first physical alterations and ends with completion of that specific refitting.