Bought 18 y.o. home with two WF Premier 2 units. Folks who originally installed the units still do maintenance. We respect the longevity of the contractor's company but question the training of the technician. They were called regarding one unit's inability to maintain the cooling set point. Questions: 1. can you check Freon charge using only one pressure gage rather than the normal two? 2. my ammeter shows a total current draw of 15A while the nameplate FLA is 34.6 - he had no comment on this - doesn't this indicate low Freon or 2nd stage not coming on? 3. when asked why the 2nd compressor stage was not coming on he had no answer 4. he added water to the system but did not check pressure differential across coils to estimate flow - temp differential was 89F in, 91F out (closed vertical loops, ambient temp 90F, output air at registers 61F, t-stats at 76F) 5. called boss who said "the unit itself would calculate when it needed to bring on 2nd stage and not a Y2 t-stat signal"? 6. system continues to maintain t-stat setting till late in the day then increases to 79F at all three t-stats and current draw never goes above 15A 7. do I need to find a different service organization?