These units are ubiquitus in northernish Europe, as any new/renovated building needs them to reach A/A++ energy effiency. Brands like Komfovent, SystemAir, offering 200 m³/h ducted units for 2000 Euros, with efficiency like:
Outdoors °C -23 -15 -10 -5 0 25 30 35
After unit, °C 12,9 14,5 15,5 16,5 17,5 22,6 23,6 24,6
