I am getting very frustrated with my AC system and my non-responsive contractor in Las Vegas. I keep telling them that my system is short cycling...6-9 minute run times, and they say it is normal for this new system. It cools down fine. But I have 40-50% RH indoor vs about 30-35% with old system, probably due to short run times. House is single level 1165 sqft. Outside summer temps are 100-110+ typically. It is a three ton Lennox HSX19 two-stage AC and G60V variable speed heater and blower. Thermostat is the Vision Pro 8000 (#1008 model)
Is there ANY modification or adjustment that can be made to override the short AC cycle times, and make it run for at least 30 minutes or more, preferably at low stage/speed?? I cannot seem to get a straight answer, and my contractor thinks all is right in the world. I feel the entire system, and mainly the compressor may be getting abnormal wear and eating extra energy to start up each cycle. I already know this system was probably oversized a bit....using a sqft per ton method. I will now get a Manual J calculation from two other contractors to verify my suspicions and make my case that it should have been done by them before installation. I DID ask for that Manual J, but was told during all estimates it was not required. Opinions on where I should go from here, short of legal action on this contractor? I paid big bucks for this thing. Thanks.