I had a bad experience last summer .I let a guy who got his license over the internet supposedly 100 hours of instruction install a 1 ton unit. I knew i was in trouble when i saw him tightenig the fittings with vise grips.But he claimed he installed dozens of systems with Zero complaints. Well after 1 month the freon all leaked out and the thing died. He looked at it a few times but it was clear he had no clue how to go about fixing it. After another month i uninstalled the whole system and delivered it to his front porch. I noticed he tried to install it on his own house but eventually it was gone from there as well. The moral of the story is "Even guys with a HVAC license cant always reliably install these things and even when they do get the install to work ,cant fix them when theres a problem".
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