The Dyson Hot+Cool HF1 Rapid React heater fan provides all-season thermal comfort. It delivers fast, precise whole-room heating in winter and powerful cooling in summer all in one quiet, energy-efficient machine. Its advanced sensors monitor and adjust for your ideal temperature, warming your space by one degree in as little as 3 minutes. Designed for safety with no exposed heating elements or fast-spinning blades, it features automatic tip-over shutoff, and a child lock. Sleep mode offers night-time comfort and is quiet as a whisper. The Dyson HF1 keeps you comfortable, whatever the season.¹Tested in a 1236ft³ room. Vs. previous model AM09. Fan, not air conditioning unit.²Vs. Previous model AM09.³Vs a non-thermostat controlled heater. After reaching target temperature and maintaining it. Tested in a 1236ft³ chamber when using the hot air mode and the product setting temperature is 77 degree(s)F. Comparing with continuous operation with power consumption of 1500W. Results may vary depending on room insulation.4App functionality may vary per market. Requires Wi-Fi and app enabled device. Standard data and messaging rates may apply. Requires iOS version 15 or above, or Android version 8 or above. Your mobile device must have Bluetooth 4.0 wireless technology support. The Bluetooth word mark and logos are registered trade marks owned by the Bluetooth Sig, Inc. and any use of such marks by Dyson is under license.5In Sleep mode, fan speed 4.