Just remember that HVAC is not an expense. It is an investment.
And like any investment, If you invest wisely, you will never regret it.
Get the techs advice and adhear to it. If you read through the posts.....when HOs don't listen to the PROFESSIONAL technician, they get screwed in the end and in turn blame the industry.
The HOs that listen and adhere to advice are always happier than those that don't.
I fully support the military and the War on Terrorism.
If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.
If you do know, then do. But do it right. Otherwise, you may not be doing it long.