Checking out a Zanussi portable heat pump air conditioner ZPAC9002 as a heater for my home workshop. Basic introduction to the product then testing and a DIY twin hose conversion to improve efficiency. Part 2, where I use it to cool the workshop, is now done and can be found here: • Zanussi Portable Air Conditioner ZPAC9002 ... Of course using any commercially produced device with a modification like this may invalidate any guarantee and/or insurance cover so decide for yourself before doing anything similar.