Should every house have a HRV System?

It depends on the house. There would be no benefit to installing one in an old house with ‘natural’ draughty ventilation. However, if you are renovating an old house and intend to seal it and insulate it, then it is recommended.

Q. Do I still need a heating system if I am using a heat recovery system?
A. Yes. HRV is not a heating system, it’s a ventilation system. It recovers the heat you would ordinarily loose through natural draught ventilation, wall grilles and trickle vents etc.