Excercise vigorously in it. Body heat... It's the best kind
Hot Water heat
Solar
burn it
Set it on fire!
As refrigerators give off heat from the back, the only real way to conserve the heat from it is to use it in a room that is already cold. Thus using the heat from the heat exchange on the back to add to any heat source in the room. This will not act as a heater for the room but may help to maintain the temperature very slightly when the heating is turned off.
Cheapest way is by Rectifiers.
It is the ratio of room sensible heat to the total heat.
The cheapest room rate for the Fairmont in Scottsdale is normally $159 per night. There is currently a Summer special however which allows for a savings of 15% so the room rate for a single room in the Summer is $136.00
The cheapest way to build a helicopter is to build a LOT of them. This way you get economies of scale.
The cheapest room would depend on what month you would wish to stay there and the number of adults/children. The cheapest room in July would be __¥118 where as if you were to book in November it would be as little as __¥78. Again, in January, the price would be different too.
As heat particles rise the cool particles work their way down through them thus cooling the room!
The cheapest and quickest way is AIR-PLANE!