I installed a DeLongi system in my home office a couple of years ago. Nice
remote controlled indoor unit with all the moving bits, flashing lights,
etc. Not too big. approx 1m wide, 400mm high.
Outdoor unit not bad looking.
Indoor unit came with umbilical containing hoses and supply cable for
connection to outdoor unit. Simple installation. 13A plug on the indoor unit
(I plugged mine into socket in loft space) and the three connections of the
Works a treat.
My only crib is that the umbilical is not long enough but then if it was
twice as long it still wouldn't be long enough!
I hired in a hydraulic boom an operator for an hour to lift the outdoor unit
up onto it's brackets (pre-fitted to wall) as it's at loft height and is
bloody heavy. Ladders not a sensible option.
Total cost... £400 for the aircon (ex demo - usually 900) plus £80 for the
Good question. I specified a non-heat pump model when I ordered
it, but the remote control has several heat functions. But I
haven't tried it.
But given that we have CH, I don't think I'll be using it to heat.
I wonder how the "recovered" heat works out cost wise compared to the CH
since the heat recovery is supposed to be more than 100% efficent... if
it is cheap enough (and you have a TRV on the radiator) it might be
I'm a little dubious...
First off, I'm happy to put up with fan noise in the summer for
the sake of cooling, but if I can have quiet heating then I'd
rather have that.
Second, the room is effectively already electrically heated by
the PCs - the CH is just backup :-)
Third, I'm on oil, which is really, really cheap.
But I'd be interested in any heat efficiency figures, just from
a curiosity point of view.
True - I didn't notice that info.
Of course these figures have to depend on outside air temp and more data on
that would be nice.
It seems almost too good to be true that you can fit an air con unit for
£500 and not only get cooling in summer but relatively cheap heat in
winter - not a main heat source but it reduces the cost of heating using
electricity by more than half.
Its very efficient. I can;t remember details, but heat pumps are - even
with teh cost of electricity to pump the heat - reckoned to be overall
better than burning the oil.
One can envisage a huge underground heat or cool bank, that heats the
ground in summer, and freezes it rock solid in winter, being used to
heat and cool a house.
I would love to give it a try one day.
This depends on the efficiency of the heat pump. The are rated by their
A US university did this. They heated a building during the winter by
extracting heat from the ground. This turned to near permafrost by the heat
pump(s). They then cooled the building during the summer by extracting the
coolth from the permafrost they created.
The a/c in question is an air-to-air heat exchanger, which generally is the
most inefficient. Ground or water sourced, tend to be the most efficient
setups. With an air to water heat pump, when the outside temps are around
freezing they usually only supply warmish water.
The cost of running them is slightly more than a good natural gas condensing
boiler, but the problem is the "very" high capital cost of installation, the
main reason they have not been taken up, except in special conditions.
Enthusiasts tend to install heat pumps. The government does not promote
them as they use electricity which is very efficient from burnt fuel in the
power station to point of use. If heat pumps were taken up en-mass the
greenhouse gasses would rocket. The government is attempting to get people
to use high efficiency, low emission, natural gas burning at point of use.
They also have faith in the new MicroGen Stirling boiler electricity/heat
boiler. Much more efficient all around burning gas at point of use. Unless
we adopt the Swedish method of local combined heat and power, power
stations. This is unlikely as the UK centralised power generation after
WW2, and is investing heavily in wind power.
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