The Dyson Pure Hot+Cool HP4A is a three-in-one air purifier, heater, and fan that monitors and purifies air automatically. The unit features a 360-degree Glass HEPA and activated carbon filter that captures 99.97% of particles as small as 0.3 microns, including allergens, bacteria, pollen, and mold spores, while removing gases and odors.

The machine includes an LCD screen that displays real-time air quality data including particulate matter (PM2.5 and PM10), volatile organic compounds (VOCs), nitrogen dioxide (NO2), formaldehyde (HCHO), temperature, and humidity levels. In auto mode, onboard sensors continuously monitor air quality and automatically adjust settings to maintain target conditions. Users can set a specific target temperature, and the machine switches between heating and cooling modes as needed.

Key features include adjustable airflow speed with variable oscillation from 0 to 350 degrees for whole-room circulation, a magnetized curved remote control that stores neatly on top of the machine, night mode with quieter operation and dimmed display, and a sleep timer for automatic shut-off. The airflow direction can be toggled between front-flow fan mode and back-flow for air purification without direct airstream. The machine notifies users when the filter needs replacement, typically every 12 months. This model (HP4A) does not include WiFi connectivity.