Friday, September 24, 2010

Faulty / inefficient aircon unit costing $228 per year in standby!

After Scott's first email, that we posted here:

... we got another email from him this morning:

"My journey of discovery didn't end at the hot water system.

My night time standby power has been consistently over 200 watts since I installed the ENVI. From my googling the average for Australia is 86 watts.... So I turned absolutely everything off in the house. Still reading 140 watts?

Next stop was the power board. I started by turning the obvious circuits off. Stovetop, oven, aircon ciruit.

As soon as I turned the airco circuit off, the meter dropped [130W] to 10 watts. I was dumb founded. The aircon was not running, but turning the circuit back on showed it consumes 130 watts in standby.

I confirmed it was the outdoor component of the split system by turning the isolation switch off at the outdoor unit.

[Once I'd turned this off, the house draws] only 10 watts in use (which is the dc converters for the down lights)."

We did some quick maths on Scott's findings.

130W = 0.13kW.

0.13 x 24 hours x 365 days = 1138 kWh (or units of electricity) used per year!

At $0.20 per kWh (that's an average across Australia) that's $228 a year.

Over ten years, that's $2280, assuming that power prices aren't going up!


  1. I have got a similar offer. Not quite sure about the brand. However I was going through the internet for any review if available.

    Split System air conditioner

  2. To help you narrow down how much a window air conditioner is going to cost, you first need to figure out the square footage of the room you are looking to cool and the BTU’s needed for that size space.