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.