How mamy kw's r used by a 70's model, 3 ton Carrier condenser unit per month?

Question

How mamy kw's r used by a 70's model, 3 ton Carrier condenser unit per month?

Answer 1

A 1970's vintage 3-ton central AC unit will have a demand in the range of 3.5 to 4.0 kW.

Now you have to figure out how many hours it will operate during the month.

4.0 kW x ____ hours = _____ kWh.

A new 3-ton AC unit purchased in 2008 will have a demand closer 2.5 kW yet provide the same amount of cooling.

Answer 2

2500 kWhr (assuming it runs 24/7)

That's just an educated guess based on my experience with AC units.  It could be anywhere between 2000 and 3000.

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