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Hello, IF... the timing is exact to the minute each day, no variance from the shut off and turn on time, the problem is that the thermostat is programmed incorrectly to be OFF those hours.. investigate that.
IF...the timing fluctuates the problem could be that the utility company has you on a mis programmed load shedding program (but only if you subscribed).
Tell me in detail exactly what the Lennox dealer has to say about the situation, not the AC warranty guys unless they are from the dealership.
we can go from there
Talk to the owner of the company and tell him politely that you need their best controls man out to your place when the unit is not running as part of his dealership warranty (obligation)... it is not your concern that his men get off at 4 pm, this is close to a 24 hour business... it is ludicrous that he well not send a man out when your system is off.... regardless of the time of day.... and at only a few months old, it should be 100% free of charge.
Let him know that politely, tell me exactly what he says or does... his position that his men get off at 4pm is ludicrous.
No business man with any brains would fail to have a man out there when his brand new system I giving problems... even if it was 3 am. a good outfit would take care of his customer.... that is how a company stays in business.
If this fails for whatever reason, tell me which direction you are from the center of the nearest city and I should be able to connect you with a sensible outfit.
Tell your lennox dealer that too, have a nice vacation.