It depends on the state you wish to become certified in and how dedicated your are to the courses. Full time it looks like in some states you can become an x-ray technician in 18 months, if you go full time. Part time courses could take anywheres up to 4 years.
Radiology technicians can obtain degrees from local community colleges. There are also many online courses offered to become a certified radiology technician.
Adding freon to an air conditioning unit should only be done by a certified technician. It is in fact illegal for anyone to add freon to air conditioning that isn't properly certified, so one would add freon by calling in a certified technician to do it for them.
That would be best if left to a certified technician because of the wiring involved.
For a full time student it would take about 2 years to become a certified Automotive Service Excellence technician. Certification is not required for employment but is often helpful.
Being certified as a radiology technician is not really required, however employers would really rather hire a person who is a certified MRI Technician. In other words, it's not require but you should get it anyway. http://www.mritechniciantraining.org/ explains all the questions you will possibly have for this along with the top MRI schools.
make your workplace clean
It is most likely out of Freon, if this is the case you need to have a A/C certified technician add more. If you are out of Freon ask the technician to check for leaks while their at it. Its a fairly cheap fix and they shouldn't charge extra for looking for leaks. If this isn't the problem then it could be bad compressor, a blockage in the system, etc. No matter the problem A/C repairs by Law have to be done by a certified technician. Good Luck.
It would be best to have a certified technician look at that as it can be quite complicated.
In order to obtain a lab technician's license you would be required to pass the course needed to become one and then take another test to get the license.
Yes, I would highly recommend it. Preferably someone who works for the brand of the gas fireplace as they would know how to fix it and have it working in a timely manner.
Certification varies from state to state. In Nevada there is no certification process however in California one needs to have completed a twenty hour electronics course and pass a written test with at least a 90% proficiency to be certificated as a professional installer.
The American Registry of Radiologic Technologists offers testing and certification to all aspiring radiology technician. You should be able to get certified there.