On 2007-06-15 18:46:57 +0100, "Pete @ www.GymRatZ.co.uk"
said:

Just a quick one.
I have had a spam about an airconditioning unit which I wouldn't
normally read, but one claim interested me...

"1.3 kW input power spent you get 3.9 kW of heating / Cooling Output"

How can they make such claims?

Cheers
Pete

One can always make claims.

Actually it's straightforward.

The natural inclination is to think you can't get more out than you put in.

If it was electrical energy in (A) to produce heat out directly (B)
then B will not be greater than A.
Actually it will pretty much equal A.

This isn't happening here.

The aircon is using energy in (A) to move heat from (B) (inside) to (C)
(outside).

To achieve that does not require (A) (B)


For the heating case, the heat is moved from outside to inside.