Can you retrofit MVHR? Yes say the experts, but it will require careful planning and possible compromise
Briefly

MVHR (mechanical ventilation and heat recovery) systems are increasingly seen in new builds, but retrofitting them in existing homes is less common yet valuable. While it poses challenges, such as space constraints and structural limitations, effective retrofitting is achievable with planning and expertise. Properties undergoing significant renovations provide ideal conditions for integration. Skilled installation can potentially lead to improved indoor air quality and energy efficiency, making it a worthwhile consideration for homeowners looking to enhance their living spaces.
Retrofitting MVHR into existing homes can be technically challenging, but with proper planning and expertise, it remains a feasible option worth considering.
Existing homes with solid timber joists may complicate MVHR installation routes, but tailored design and skilled installation can achieve success in improving air quality.
Read at Homebuilding
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