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2. Kerosene heater - Wikipedia

   en.wikipedia.org/wiki/Kerosene_heater

   However, most kerosene heaters do not require electricity to operate. Most heaters contain a battery-operated or piezo-electric ignitor to light the heater without the need for matches. If the ignitor should fail the heater can still be lit manually. The Japanese non-vented "fan" heater burns kerosene gas and is known as a gasification type heater.

3. The Best Portable Heaters Will Warm Any Room of the House - AOL

   www.aol.com/lifestyle/warm-room-house-best...

   Amazon Basics 500-Watt Ceramic Small Space Personal Mini Heater, best portable heater Amazon Basics 500-Watt Ceramic Small Space Personal Mini Heater Price: $18.29

4. Electric heating - Wikipedia

   en.wikipedia.org/wiki/Electric_heating

   A heat pump uses an electrically driven compressor to operate a refrigeration cycle that extracts heat energy from outdoor air, the ground or ground water, and moves that heat to the space to be warmed. A liquid contained within the evaporator section of the heat pump boils at low pressure, absorbing heat energy from the outdoor air or the ground.

5. Thermoacoustic heat engine - Wikipedia

   en.wikipedia.org/wiki/Thermoacoustic_heat_engine

   SoundEnergy developed the THEAC system that turns heat, typically waste heat or solar heat into cooling with no other power source. The device uses argon gas. The device amplifies sound created by the waste heat, converts the resulting pressure back into another heat differential and uses a Stirling cycle to produce the cooling effect. [2]

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Crankcase heater - Wikipedia

   en.wikipedia.org/wiki/Crankcase_heater

   The crankcase heater keeps refrigerant at a temperature higher than the coldest part of the system. A crankcase heater generally has the same electrical symbol as a resistor because it converts electricity directly into heat via electrical resistance. The resistance in the heater coil determines the heat it produces when voltage is applied. [1]