Yeah HVAC techs use nitrogen a lot. They use it for pressure testing, cleaning line sets, flowing while brazing to avoid oxidation, and sometimes even to clean

Yeah HVAC techs use nitrogen a lot. They use it for pressure testing, cleaning line sets, flowing while brazing to avoid oxidation, and sometimes even to clean out condensate lines. Hopefully your AC is working well, it is in the mid 90s here today in the New England.