Monday, March 17, 2008

Air Condition time in Alberta = 39 cents/hour

A rated 2 ton air conditioner (built in) is standard for houses up to 1200 or 1300 square feet.
Rule of thumb which works is 1 ton for every 600 sq foot of building. 1 ton = 12,000 BTU.

An efficient 2 ton built in unit cost of operation:

Power: 208 Volts at 13.5 amp = 2808 watts/hour of use.
Power Line charge .02
Power Contract .09
Power charge delivered 11 cents per kwh

Furnace motor efficient or semi efficient 7 amps @ 110 volt = 770 watts/hour

Total operational power 3578 watt/hour
Total operational cost 3.578 kwh X .11 per kwh = 39.3 cents per hour
This works out to 3.93 for 10 hours of continuous operation.

With reasonable insulation and decent windows one can reasonably expect a 60% duty cycle.

Providing your furnace fan shuts down with the air conditioning, this would leave you a bottom line of $2.36 per day for air conditioning.

Having said this, I see where ENMAX has again increased their contract rate and incorporated a per month charge on the same path the EPCOR has found a success.

Between their monthly increase and their add on charges they have again increased their rates 1 cent by 25%. On the other hand, EPCOR seems to be down by nearly 1 cent. Will have to look close at their add on charges.

John Clark
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