last year we fitted a what i call a plumming heat pump ie a heat pump that is made by one of the water boys ie worcester for the local council as a test for fuel efficientcy i did ask at the time if they wanted a mitsi or a daikin but what do i know,anyway we fitted this system it was not a invertor and not even fan speed control they fitted a elec meter and saw it spin relentless and then said it was to expensive to run one tip guys stick to a main brand we have now fitted a mitsi in the last three months the customer is happy and the elec meter is 52 percent less than last year