On Wed, 02 Jan 2019 00:02:15 -0000, alan_m wrote:

On 01/01/2019 21:07, Commander Kinsey wrote:

If the insulation was better than that used 30 years ago, then the time
between switching off and back on again would be longer, as less cold
would leak out - this can be verified by observing the sides are cold..
Also, if you look at the energy ratings on various freezers, you'll find
a factor of almost 4 between different models, so clearly some are using
really **** insulation.

Or there is a 4:1 variation between the capacity between the smallest
and largest model.

Are you claiming the size makes a huge difference in efficiency? Surely there isn't much size difference, and I was only looking at fridge freezers, which aren't that much difference in size.

A quick look at a couple of dozen under counter freezers from one
supplier who stocks around 8 different brands from £130 to £500+ shows
operating costs in the range £23 to £30 per annum with the majority
being in the £26/£27 region. So comparing freezers of the same nominal
size shows a much smaller variation in operating costs. Some of the
cheapest to buy had the better figure

Please post a links for freezers of the SAME size showing the 4:1
variation that you claim

https://www.sust-it.net/energy-savin...freezers-large

The best is the Liebherr CNP4858, 5p/litre/year, with 260 litres of fridge and 101 litres of freezer.
The worst is the Fisher & Paykel E442BRXFD, 19p/litre/year, with 295 litres of fridge and 91 litres of freezer.

So similar sizes with drastically different efficiencies.