The paper presents two low-cost photovoltaic utilization schemes (1-50 kW) for ventilation and air conditioning loads. Both schemes can be controlled by novel dynamic on-line power tracking regulator. This ensures maximum power utilization and energy efficiency under varying conditions of solar insolation levels. The system could be used to conserve electric energy through the decrease of electric demand particularly in developing countries. In addition, the system offers benefits in other areas such as indoor enhanced air quality.