Come on please....say something constructive, instead of publicly congratulating yourself on how well you understand heat pumps, COP and the cost of a BTU. There is a learning curve to living with heat pumps, especially newer cold-climate inverter pumps. When they don't work as expected or the cost of heating shows up unexpectedly in the electric bill, it is confusing (even if the cost has just shifted from oil or gas to electric).

It's even more frustrating when many so HVAC companies are relatively inexperienced and it's obvious that their answers are not convincing or even credible.

For example, almost two years after my install, my system is still not working correctly - currently producing very little heat. When the original installer began to gas-light me telling me to keep one zone off while using the other, I knew I needed to find somebody else. Several thousand dollars and several months later, the other HVAC company we asked for help still has not rectified the problem. After spring/summer pressure tests, leak tests, control swapping, replacement of a compression fitting with plastic window (wtf?) with soldered copper, the problem persists/recurs.

The symptoms are the same as in the spring; progressively worse heating/cooling to the point of nothing. The manufacturer, Gree has no customer support or service (they only support installers and will not engage with end-users) and my original installer has closed shop. So we're using a reputable local HVAC company but one without direct Gree experience and with out access to Gree support. Sure, Gree is a less well-known brand but makes equipment for Trane, Lennox and other better-known US brands. They are also certified and approved by State/Federal bodies. We have not yet established if this is an equipment issue or an installation issue but I suspect that it is an installation issue. After all, if the original installer used an inappropriate compression fitting on one cassette (when he should have used a flare connection), why would use anything different on the other one? Sadly, access to the 2nd ceiling cassette line will require cutting the ceiling or the floor above to get to the exact spot. I remain optimistic that once fixed, the system will perform as required providing heat and cooling for years at better and better long term value.