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Every year i get my central air unit serviced and they add R134a refridgerant to it. i was wondering how hard it is to do this, i change all my filters in my furnace and air flow is good, i just can't see spending $60 an hour for something i can prolly do myself.

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Ok first off you will need to know the expansion rates of refrigerants vs. temperature rise and gain. Next you need to know some algebra to equvilate what said pressure should be by temperature and type of refrigerant. Next you will have to find a place to take the EPA exam, then if you pass with an 75% or higher that step is complete. The next step would be to study for the B&A Exam this is a 6 hour exam that you must pass with a 80% or higher where I live. To take this exam you will need to spend $2500 on course work and another $4000 to $5000 on books. Then if you pass that exam the next step will be to buy a truck and tools this may range anywhere from $50,000 up to and sometimes above $150,000. Oh and I forgot that you will also need to get bonding insurance mine costs around $10,000 a year. Oh yes you will need a building as well that should be around $2500 a month. So there you go for around $122,500 you could get started on adding your own refrigerant. Please dont take this the wrong way, I get gripes all the time about my billing rate and it is $132.50 an hour but we have a lot to lose with our investments, and future investments.

Hope this helps Ya.

Posted on Jul 06, 2008

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I remember Carrier came out with a 134a unit years ago but didn't sell very well here in TX. and I have never ran across one if this is a central air unit. If room a/c then there area alot of them. Get the leak fixed and you shouldn't have to add any. Anyone can buy 134a but then you would have to learn the pressures and buy a set of gauges, not a widow maker,( those cheap 1 hose and gauge setup that screws on the can)

Posted on Jul 06, 2008

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Also check the condensor (outdoor) coil, if it is dirty/clogged, it will run hot and not cool properly.

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Fix:
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Good luck. Please give good rating, it meens a lot to me....Feel free to contact me again...

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