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Question DetailsAsked on 8/9/2016

To accurately get HVAC cost burdens for installation, service or repairs is not possible on angies list or internet

The HVAC industry is a science, most can not comprehend the change in state of a liquid to gas, regardless if they are a laymen or a contractor of another trade. The majority of employees from HVAC companies don't understand or have experience, or mental capacity to realize exactly what part of the HVAC job they are performing, simply because of the technical challenges and science required to cool the space the are working in. FOR EXAMPLE, how do you lower the temperature or "cool" the interior occupied area of your structure, office, warehouse, home etcetera? ANSWER "A" - Cold air is made from the AC unit, specifically the component called a compressor, in conjunction with an evaporator & condenser coil, refrigerant, and a thermostat. ANSWER "B" - To reduce the temperature of anything you remove the heat. ANSWER "B" IS CORRECT, the unlicensed contractor with no permit or insurance gave ANSWER "A". SEE THE POINT. LCD LEADER DOESNT HAVE A CLUE.

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The poster did not refererence a particular thread or question that he feels was incorrect, so no way to respond to that - a pity, because if something was wrong it would be nice to be able to correct it - or he could post his alternate or contrary opinion on the post itself.

However, I would certainly challenge the claim that HVAC contracting or system installation is a "science" - the design of a new model involves some science but is basically straight-forward engineering in combining known principles and elements into a new design and testing it, unless a revolutionary design (say for spacecraft use). However, sizing, installing, and fixing a unit is technician country, which "uses" science built into the unit and thermal tables developed from science but does not require any particular science use or magic capabilities on the part of the technician. It just involves straightforward determination of unit sizing and airflow requirements (normally using the ACCA Manuals), installing the selected system per manufacturer specifications, leak-testing and charging with refrigerant, and adjusting the operating pressures/refrigerant flow per the manufacturer recommended settings for the ambient temperature at time of installation.

As to his answer A and answer B - both are equally right. A is the practical mechanics of creating chilled air to cool the structure, B is the most basic description of the thermodynamics involved.

Oh - BTW - cold air is made primarily at the evaporator coil, not the compressor - that is actually the hottest part of the system as it recompresses the refrigerant, so the "A" answer is not really quite right.

And I am sure the instructors at the Carrier Advanced air conditioning and refrigeration course would be disappointed that you think someone who completed their factory resident course doesn't have a clue about HVAC matters.

Answered 3 years ago by LCD

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