This Heat Pump unit is only 1.25 year. The best option is to called the contractor, who installed.
Here is two thing you could help the techs with. You need to observe the compressor and outdoor fan.
Observe the outdoor fan
Whenever, you're not getting cool air. Go where the condenser unit is at and see if the outside fan running. If the outside fan is running, it working fine.
Observe the compressor
There should be two copper line going to the house. You should see the insulated and big copper line and small bare copper line. ( they should be 5 or 6 inches away from each other.)
The big insulated copper line should be cold. Put your hand on it and see if it cold. The small bare copper line should be hot, so put your hand on it and see if it hot or cold.
Heat Pump will operate as regular central air conditioning unit in the summer. However, in the winter. It is reverse.
You're the best person to troubleshooting the heat pump units. You have to listen, smell and look and write it down if you have to. The next time you see the techs, tell him what you know.
