This sleek, potent appliance from Lasko does double duty as a fan and heater and is especially handy for in-between ...

although hybrid units are available that can also use grid power. In places where grid power isn't available, a battery can be added allow the air conditioner to operate at night. Another type ...

“When the air365 Hybrid system is in heating mode ... Johnson Controls-Hitachi Air Conditioning offers three versions of the dual fuel system, weighing from 30.6 kg to 38.1 kg.