anyone still using NATIONAL window casement aircon at home?

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An honorable member of the Coffee Shop Has Just Posted the Following:

20 plus years and it is still running fine.
cant seem to find national brand in the market anymore. vintage:D

CAM00672.jpg (http://www.sammyboy.com/attachment.php?attachmentid=15835&d=1404015920)

CAM00670.jpg (http://www.sammyboy.com/attachment.php?attachmentid=15836&d=1404015937)

base on the spec,is it correct to say it consume
230 x 4.4 = 1.012 kwh energy
is about paying :
$0.25 or $0.30 per hour of enjoyment?

i have 1 national casement in room 1
1 portable acma aircon in room 2 ( 7600btu)

is it worth to scrap the current 2 aircon and upgrade to inverter system 2 so that paying less bill?
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