Certification Requirements:

• Max space heating and cooling energy < 1.4 kWh/sf/year (4777 btu/sf/year)
• Max primary energy usage < 18.6 kWh/sf/year (63,500 btu/sf/year)
• Air tightness < 0.6 air changes per hour @ 50 Pa

The energy calculation uses these values:

• Indoor temperature: 68 deg F
• Internal heat gains (from lights, people, cooking, etc.): 0.7 Btu/hr/sf
• Occupancy: 377 sf/person (other values between 215 and 538 sf/person may be used with an explanation)
• Domestic hot water use: 6.6 gal/person/day
• Domestic hot water temperature: 140 deg F (120 is standard in the US)
• Domesitic cold water temperature: 50 deg F
• Average air flow rate: 12-18 CFM/person

Passivhaus certified windows must meet these standards:

• U value < 0.14 (R-7)
• SHGC > 0.5

This presentation is a good overview: