Optical 5.1KW Reverse cycle Airconditioning heats and cools $719 plus delivery from $35
Rated at 17400btu cooling and 20500btu heating you can use it in all seasons. The unit gives nearly 6kw of heating for around 1.8kw of input power so its cheaper than some other forms of heating too.
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Although the unit comes pre gassed you would be advised to get an engineer to mount the units, pipe in the supplied connecting tubes and teminate to a suitable power supply.