It's bound to do some good. Similarly keeping your fridge full of food will help, if only because you lose less "cold" when you open the door and all the cold air falls out on the floor.

Mmm,
I think what you are saying is that anything that comes in with a different temperature up or down from the house ambient in theory would push the house temp slightly in that direction? eventually.
Therfore, if i place ice from out side in my fridge, the fridge is slightly colder by that amount thus being warmed more by the ambient (as the heat will want to go towards the cooler) and the compressor is operating less giving off slightly less heat (to the house) so overall there is a net decrease in heat(temp?) in the house. Its a case of tipping that energy balance in one or other direction.
As to being marginal well there has been lots of discussion on this site about thermal break of a key lock on the front door so I think we'll still want to debate it. At high levels of thermal performance yes it may/may not contribute in one way but at everyday levels perhaps not measurable.

So assuming I put 2 x 2kg of solid ice from out side (no input energy required) into my fridge every morning at 9am whats happens and why?????

In my case I cant fill 2 lit drinks bottles and leave them out becuase a) dont use them, b) uses water (no cost - I have my own) but, c) my borehole water supply is pumped so for every lit there is x seconds of elec driven pump cost.

Cheers

Ok so this means the only way to improve fridge performance (a fairly common consideration) is to add insulation in an appropriate manner. Helping the condenser cool is ok but there is an off set with regard to the heat from the motor.

Cheers

Interesting point about the use of ice. Ed's right, if you look on the house as a closed system, with a fridge in it, then bringing anything into that closed system that needs its temperature increasing will use more energy.

<blockquote><cite>Posted By: Seret</cite>The lesson: Keep your cotton wool balls in the fridge.</blockquote>

I wish this forum had a "memorable quotes" section............

Interesting thoughts going on here.

I know in the summer, when we have extended periods of warm weather my old fridge used to struggle to keep cool. Pulling it out a bit definately helped (subjectively) as there was more air movement. I am temped to add a pair of fans to my current fridge and freezer for use in the summer to help improve the performance. In thoery the lower the temp difference between the hot and cold side of the pump the better the efficiency of the system. But I would only bother doing this in the summer.

Surely all of the 'cold room' larder setups end up causing a conflict of detailing in a high efficieny house. I.e. cold room need a decent door between it and the habbitable space. Also thermal bridging is likely to be a problem too. Surely using a decent A rated (or better) fridge and freezer result in less hasstle, and perhaps a less compromised building design in the long run?

I proposed a cold larder on the other fridge thread but mine will be outside the house envelope,(part of the garage/workshop) and its door will be into the boot room (also outside the envelope) with another door into the house and a third to the outside(the boot room acts as an airlock to the back door) so thermal bridges should be minimal.