How often do you want the filters changed? Keep away from fiberglass or what the industry calls standard. They don't last and before long you will have extremely dirty coils. We...
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Every course you listed will help an apprentice learn and work in the HVAC field along with necessary on the job training. The Chiller course may be for the more advanced techn...
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The chart I am using shows the suction for air conditioning should be around 118# for 410A
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