Hi,  My architect has specified an MVHR for our new build property and sold us on the benefits of airtightness and controlled air quality improvements. The property is 5 bedroom and just under 300m2 over two stories. We've had quotes ranging between £7000 and £21,000 for a variety of units including:  Zehnder ComfoAir Q450 Sentinel Kinetic Highflow Airflow Adroit Pichler LG350 Zehnder Comfosystem Q350 with various different options for ducting