EcoRenovator (
-   Appliances & Gadgets (
-   -   Kill your (old) Fridge (

TimJFowler 06-16-10 03:27 PM

Kill your (old) Fridge
Thanks to a $200 state appliance rebate program (and $30 utility rebate) I've upgraded our refrigerator to a 2010 Energy Star model. Thanks to my Kill-A-Watt, I've measured how much electricity we are no longer wasting.

I was able to recycle a 1990's vintage refrigerator we have in a rental property. We swapped a 2002 fridge to the rental and put the new Energy Star fridge in our home. Other than age, each of the three refrigerators was comparable with a top-mounted freezer, 16 to 18 cubic feet and no ice-maker. I tried to keep operating conditions similar for the comparison, although my test favored the oldest fridge as I never opened the door during the test.

Refrigerator Energy Use Comparison

1990 Fridge: 4.62 kWh / 26.7166 hours = 0.1729 kWh/hour = 4.15 kWh/day
= 1514.83 kWh/year

2002 Fridge: 1.54 kWh / 40 hours = 0.0385 kWh/hour = 0.924 kWh/day
= 337.26 kWh/year (77.7% less energy use than 1990 fridge)

2010 Energy Star(+) Fridge: 1.36 kWh / 48 hours = 0.02833 kWh/hour = 0.68 kWh/day
= 248.2 kWh/year (26.4% less energy use than 2002 fridge)

  • Energy Star(+). We chose a fridge that was 30% more efficient than the federal standard (the Energy Star requirement is 20% more efficient than the standard).
  • Turn the 'Cool' knob down. At the default thermostat setting the 2010 Energy Star Fridge used slightly more electricity than the 2002 fridge. I noticed that lettuce on the bottom shelf was freezing, so I adjusted the thermostat a few notches warmer and the energy use went down measurably.

I've written a longer article here: Kill Your (old) Refrigerator |


Daox 06-16-10 08:37 PM

Wow, thats quite the step forward. I've been meaning to measure my fridge lately. I just keep forgetting.

Piwoslaw 06-18-10 02:50 PM

Wow, that '90's fridge was a hog. It's hard to believe how much refrigerators have changed in only a few years. If only car companies could increase fuel efficiency fourfold in a decade...

EDIT: I've had my fridge on the Kill-a-Watt for the last 2.5 weeks and I just had a look: 11.65 kWh in 400.1 hours.
11.65kWh/400.1h=0.029 kWh per hour = 0.70 kWh/day = 255 kWh/year.
You beat me, Tim:thumbup:
It's been hot recently, so the temperature in the kitchen is around 21-22C. The kitchen temperature in the winter (exept when cooking/baking) is 18-19C, so maybe then I'll use slightly less.
The brand is ARDO, model CO 2210 SHX, rated at 256 kWh/year = 0.70 kWh/day.

EDIT: Added more data (model, etc.).

EDIT (04-04-2011): A recent test showed that lower kitchen temperatures (16C-19C) reduce the fridge's power consumption to 0.54-0.59 kWh/day.

TimJFowler 06-22-10 02:11 PM


Originally Posted by Piwoslaw (Post 7117)
Wow, that '90's fridge was a hog. It's hard to believe how much refrigerators have changed in only a few years. If only car companies could increase fuel efficiency fourfold in a decade...

No joke there. I was stunned / disgusted at how much power the '90's fridge used. The problem is that fridges tend to last a long time and there is no obvious sign that they waste a lot of power.


Originally Posted by Piwoslaw (Post 7117)
You beat me, Tim:thumbup:

Well, a new fridge beat an older fridge. I should check back in a year to see if the 2010 fridge maintains this level of efficiency.

I've now got a mid '90's vintage 27" CRT Television plugged into the Kill-A-Watt. I'm curious to see how much power the old TV is eating.


victoria19 08-31-10 03:25 AM

We have refrigerator in our house and we are really shock every time they will give us a monthly electric bill. We wonder why it was too high. Then we realize that refrigerator is the reason. So now, we don't use our refrigerator and other appliances.

All times are GMT -5. The time now is 03:50 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Ad Management by RedTyger