Hi all,

a friend has recently moved business premises and asked me, after
complaining how hot it's been lately and probably how cold it might
get in winter, about air conditioning

The floor space is approx 1000 sq metres (27,000 sq ft) and the
ceiling height is 5m (16ft). No large windows, front glass door and
roller door at the rear. Uninsulated ceiling (basically it's a masonry
building with a tin roof with 4 plastic sheeting skylights). If you want
to see the building on Google maps, 2 Akepiro St, Eden Terrace,
Auckland

Using a variety of on-line calculators gets a result 80 - 400kW (!!)
or, confusingly, BTU/h units. The wide range of results was no help
at all

Local suppliers' units advertised as "commercial" are typically 7.5kW

In a shop I visited yesterday, approx 1000 sq m x 3m ceiling, which is
comfortably cool, they have two ceiling units about 600mm square.
Unfortunately the rating isn't known by the shop manager (he just sets
the temperature and wasn't willing to do any climbing. pffft, whatever
happened to 'service' ? ;)) )

With your personal experience, what would you suggest for a unit
that would keep a volume like this at say 18-20 in summer (25C
outdoors) and maybe a little lower in winter (10C outdoors)

TIA

Joe
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