The ultimate high performing home is a ‘Certified Passive House’. This home has been tested, measured and internationally certified to perform thermally at an extremely high level with known (but little to no) heating and cooling requirements. Cost or design may make this ultimate level prohibitive for some but aiming for the best performance level you can achieve within your personal constraints is always recommended.
You can still achieve a passive house with high performance values through employing the same principles and undertaking PHPP. Certification is not undertaken, so it will not be internationally ‘certified’, but PHPP will provide certainty on what will be delivered.