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

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

    Consumer Reports’ lab engineers tested more than 90 space heaters and found that the highest-rated models can heat an average-sized room (200 square feet) in about 15 minutes, with individual ...

  3. These Editor-Tested Space Heaters Will Keep You Toasty All ...

    www.aol.com/lifestyle/best-space-heaters-warming...

    The Best Space Heaters. Best Overall: Lasko CW210 Bladeless Tower Space Heater. Best Value: Vornado MVH Vortex Heater. Best for Garages and Cabins: Mr. Heater F232000 MH9BX Space Heater. Best ...

  4. Space heater - Wikipedia

    en.wikipedia.org/wiki/Space_heater

    Electric space heaters convert electricity into heat through the process of Joule heating. The main component of these heaters is called the heating element. Heating elements come in many different geometries and styles and can be used in either convective or radiant space heaters.

  5. Do I need to worry about space heaters? Here’s what experts ...

    www.aol.com/lifestyle/worry-space-heaters...

    Local fire departments responded to an estimated average of 44,210 home structure fires caused by heating equipment, including space heaters, each year from 2016 to 2020, per the NFPA.

  6. Air changes per hour - Wikipedia

    en.wikipedia.org/wiki/Air_changes_per_hour

    Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour. If the air in the space is either uniform or perfectly mixed, air changes per hour is a measure of how many times the air within a defined space is replaced each ...

  7. Solar thermal collector - Wikipedia

    en.wikipedia.org/wiki/Solar_thermal_collector

    The bowl had a diameter of 65 ft (20 m), tilted at a 15° angle to optimize the cost/yield relation (33° would have maximized yield). The rim of the hemisphere was "trimmed" to 60°, creating a maximum aperture of 3,318 square feet (308.3 m 2). This pilot bowl produced electricity at a rate of 10 kW peak. [citation needed]