Total room air purification system with air conditioning, filtration and ventilation

A self contained air conditioning unit with ventilation and pressure control capable of exchanging a portion of indoor circulating air of a conditioned space with fresh outdoor air, and capable of creating one or both of a positive or negative pressure in the conditioned space, comprising:

• a housing;
• a refrigeration circuit within said housing including a compressor, a condenser coil, and an evaporator coil;
• a condenser side including an inlet port in said housing, a fresh air intake plenum, a condenser air path through said condenser coil, a condenser fan forcing air along said condenser air path to an outlet port, and said intake and outlet ports connecting with the fresh outdoor air;
• a conditioned air circuit including a return air intake on said housing leading into a room return air plenum, a conditioned air path leading from said return air plenum past a HEPA filter and through said evaporator coil to a supply air duct, and an evaporator fan moving said air along said conditioned air path and out said supply air duct into the conditioned space;
• an ERV air-to-air heat exchanger core within said housing having a fresh air path with a fresh air intake port communicating with said fresh air intake plenum and a fresh air outlet discharging into said room return air plenum;
• and with an indoor air path having an indoor air port communicating with said room return air plenum and an outlet port discharging into the fresh air intake plenum, and a fresh-air ventilation fan and an exhaust air ventilation fan moving respective air flows along said fresh air path and said indoor air path;
• sensor means for sensing air pressure in said conditioned space relative to pressure outside said conditioned space;
• and
• control means coupled with said sensor means and with said first and second ventilation fans for controlling the air flow along one or both of said fresh air path and said indoor air path to create and maintain a desired overpressure or underpressure in said conditioned space.