Hi Josip,

Thank you for saying "Hi". It has been quite a few years.

I continued working on copper multiport tubes. At first it was with an extruded tube manufactured in South Africa. We managed to braze the copper tube to anneal-resistant fins. The main problems were scaling up production of the tube, at fair cost.

I have had the idea of making a composite copper multiport tube, for many years. I began final developments on this, around 6 months ago. The results are looking very promising.

The biggest question is how well copper-based coils will be accepted by the RHVAC community.