On February 11, 2015 3:59:45 PM CST, Warin <61sundow...@gmail.com> wrote:
> On 12/02/2015 3:45 AM, Bryce Nesbitt wrote:
> Most air conditioners here have the ability to both heat and cool at 
> least here and in the UK.

Technically, a unit that can either cool a building, or heat it by cooling 
outdoor air and transferring heat to indoor air, is a heat pump rather than an 
air conditioner. Heat pumps are significantly more expensive up-front than air 
conditioners, due to their greater mechanical complexity, and are only 
cost-effective as a heating method as long as the temperature to which the 
outdoor air is chilled is above freezing. As the temperature of the outdoor 
condenser approaches freezing, the heat pump changes over to using a resistive 
heating element to heat the indoor air, requiring more electrical power. This 
means that, in some climates, it is more cost-effective to use a heat source 
such as an oil-burning or gas-burning furnace as the winter heat source.

-- 
John F. Eldredge -- j...@jfeldredge.com
"Darkness cannot drive out darkness: only light can do that. Hate cannot drive 
out hate: only love can do that." -- Martin Luther King, Jr.


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