4 months of heating cooling woes

It's been 4 months since we moved in and we're really happy with the house. There are a few (minor) things to fix and a few things we would have done differently ( - pay attention to where the doorbell speaker is positioned at installation) but overall things are good. Comdain have been great to deal with - no issues there whatsoever.

The only real problem we've had (and it's caused a lot of grief) is the ducted heating/cooling. We have two units - one for each floor. The units have broken down numerous times leaving us with no air-conditioning during those unbearable hot spells Melbourne experienced this Summer and now, with no heating. One breakdown you might excuse but 4 breakdowns in relatively new units is just ridiculous. We could just say "So we got some bad units, just fix it and move on" but dealing with the company that installed the units has been both disappointing and frustrating. Calls not returned, leaving us to do the chasing. Taking days to come around to even look at the units. Sometimes not coming as promised or giving just 15mins warning that they are about to come around (- who can afford to take time off work "in case" the engineer can come by). No clear explanation of what was wrong - only that it's all "fixed", only to have it break down again days later. We have heard that others with units like ours have had recent problems too. Comdain have been great and are dealing with the installer now. We'll keep you posted on this saga.