I have 1000 sq. ft two-bedroom condominium unit. Therefore I need 2.5 T cooling/heating package unit. The unit must have ability to blow fresh air from outside during the night when it is cool there without cooling/heating. Moreover there must be multi-speed blower adjustable to reduce airflow. It must contain gas heater. Does such device exist? Home appliance repairmen told me that such device did not exist, but I doubt it. It is so simple and efficient.