Consumer Reports has a worksheet for homes at:
but a shop can give a very different heat load.
The largest 110VAC window air conditioner I know of is rated at about
15,000 BTU/hr, but 36,000 BTU/hr is available with 220VAC. I seriously
doubt you need the latter or nay 220VAC unit, and smaller sizes are so
cheap that 2 of them may cost less than a single larger unit with the
same cooling power.
On 4 Jul 2005 06:48:32 -0700, do_not_spam firstname.lastname@example.org wrote:
The capital costs of two 110VAC units may be less for a given number
of BTUs but the real concern is going to be operating costs. One big
24000 BTU unit is almost always going to be more efficient than two
12000 BTU units when you consider the cost of converting electrical
watts to cooling capacity. (You will have one more compressor...one
more blower, etc.)
Nonsense. While a larger unit is inherently more efficient, just as
220VAC is inherently more efficient than 110VAC for motors, in reality
there's no difference, and small units are commonly available with
efficiencies of EER 10 (roughly like SEER 12). Also on a milder day,
operating just 1 of the smaller units may be more efficient since it'll
probably remove more humidity by running continuously.
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