This trade is always changing and evolving. Variable Refrigerant Flow can be overwhelming at first but the more time you spend learning it the easier it becomes. Small corners cut can lead to big issues later so this is for the best of the best. Do not wait until you get the call, start learning about it now. Of course it's great to take every class from every manufacturer if you have the time and money. I have learned the most from the leader in the VRF troubleshooting and service Roman Richard

KITNE SIZE KA COPPER PIPE COMMENT KARKE BOLO | Ss cool point