TVHR DX heat recovery ventilation units with heat pump, designed for saving energy and also improving indoor air quality. TVHR DX units provide heat recovery and well conditioned fresh air by air to air plate type exchanger and heat pump. 30°C fresh air in the summer time and 12°C fresh air in the winter time can be obtained by usual heat recovery units, but these results are not comfortable. It can provide 20°C fresh air in the summer time and 25°C fresh air in the winter with high efficiency heat pump.