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  2. Is It Cheaper To Run Space Heaters Or Central Heat? - AOL

    www.aol.com/cheaper-run-space-heaters-central...

    Those costs don’t include the electricity needed to power the space heaters. ... That’s because 70% of the energy is wasted during the conversion process. In contrast, gas-fired systems are ...

  3. Koku - Wikipedia

    en.wikipedia.org/wiki/Koku

    The amount of rice production measured in koku was the metric by which the magnitude of a feudal domain was evaluated. [4] A feudal lord was only considered daimyō class when his domain amounted to at least 10,000 koku. [4] As a rule of thumb, one koku was considered a sufficient quantity of rice to feed one person for one year. [5] [b] [c]

  4. Convection heater - Wikipedia

    en.wikipedia.org/wiki/Convection_heater

    A convection heater, also known as a convector heater, is a type of heater that utilizes convection currents [1] to heat and circulate air. These currents move through the appliance and across its heating element, [ 2 ] using thermal conduction [ 3 ] to warm the air and decrease its density relative to colder air, causing it to rise.

  5. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    The space between floor joists can be boxed in and used as some of the ductwork, further lowering costs. The four different generations of district heating systems and their energy sources. Electrical heating systems occur less commonly and are practical only with low-cost electricity or when ground source heat pumps are used.

  6. Space heater - Wikipedia

    en.wikipedia.org/wiki/Space_heater

    Combustion space heaters convert chemical energy into heat through combustion of a fuel. These heaters often do not require electricity to function and can therefore be used off-the-grid. Honeywell electric infrared radiant heater Sunbeam quartz space heater uses quartz tubing for infrared heating

  7. Built on backs of slaves: New mapping shows clearer picture ...

    www.aol.com/news/built-backs-slaves-mapping...

    More than 236,000 acres of rice fields spanning 160 miles once covered coastal South Carolina, according to a recent mapping project that used modern tools to document the massive footprint of the ...