The message
from "Franz Heymann" contains these words:

You can make a heat pump for no cost at all, or very little - assuming
you can find someone with an old freezer they don't want.

That will deliver around 50 to 100 watts, which is just about the amount its
motor will need to run, so you might just as well not bother with the whole
fridge. Just install the motor and switch it on permanently. Or, easier,
just run a 100 watt bulb permanently.

You will pump a great deal more than that, and you have the small amount
of heat generated by the motor as an added bonus.

If you have ever put your hand by the outblow of a freezer you have
started from ambient temperature you'll realise it's pushing out as much
as a small fan-heater.

--
Rusty
Open the creaking gate to make a horrid.squeak, then lower the foobar.
http://www.users.zetnet.co.uk/hi-fi/