SEER 13 air conditioners can usually heat until the weather outside hits 5 degrees or so. Some air conditioners come with DC inverter unit which allow them to perform in 1 to 5 degree celcius weather condition. If you are looking for a system that work in negative celcius, the new hyper heat systems can work till almost -25 degrees celcius.
Radiant floor heating is a concept that was introduced by the Romans. It is an under-the-floor heating system that conducts heat through the floor in...
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