We are Performance Heating and Cooling and we started in the HVAC trade in 1994 doing installation of ducting.  After a few years it became obvious that we would need to learn service work too.  We trained on the job and were educated through certified institutes for heating and cooling equipment.  With having both the install and repair experience we have wide knowledge of what causes so many repair issues.   I was raised with old time values which mean treat others as I wish to be treated. Why seek to repair over replace if possible.