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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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1 Answer

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Hello, sounds like it is either a low charge or lack of airflow, what type of filter are you using? sometimes those filters that claim to be super effecient will actually cut down on your airflow and cause the ac to freeze up.

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What kind of refridgerant do you use for the air conditioner

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1 Answer

Central A/C takes a long time to cool house

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Aug 22, 2009 | Heating & Cooling

1 Answer

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If the filter is clogged or the coils are dirty, it will not cool properly and potentially freeze up.

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

If all coils and filters are clean, and the fan motors are running and in good condition and it is still not cooling then you are likely low on refridgerant. (handling/purchasing refridgerant other than R134A requres a CFC certification by law)

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2 Answers

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3 Answers

The unit only blows warm air. it just stopped kicking on the condenser/compressor to make that radiator cold and blow cold air. any help?

The compressor is not starting either because:
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Re-charge the system with appropriate refridgerant, if the system has a charge already or holds a charge when you charge it then the compressor should start.
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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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2 Answers

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1 Answer

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