A Demand controlled energy efficient ventilation with air purification device (1) comprising a housing (101) including an air intake opening(s) and an air outflow opening(s) and main body; a controller and sensor section (102) having at least one air environment sensor configured to monitor at least one air property of indoor and outdoor air, at least one controller to monitor and control a device (1) and at least one human-machine interface, which is a component of a device and/or a software application to enable human(s) to monitor and/or control device(s), the device (1) can be internet of things enabled and in addition device(s) to device(s), device(s) to mobile(s) and device (1) to computer(s) direct communication can be established; fan section (103) having fan(s) (103b), damper(s) (104b) to establishing a flow of air and to regulate it, accumulator which accepts, stores and releases energy as needed and primary air filter (103a); at least one electrostatic precipitators which produce electric charge to clean the air, an air purification section (104) having air filter(s) (103a), germicide(s) and damper(s) (104b).
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