A Plus Heating & Air Conditioning

I installed a Lennox A/C system through COSTCO about 2 years ago and A-plus is the contractor for this. About one week ago, the thermostat broke. The display went blur and became almost not readable. This seems to be a very common problem when I search online as I saw similar problems are reported by our Lennox users. I called A-plus to fix the problem. First, A-Plus said they will come to do a diagnosis first for $120. I told them it is the thermostat display problem and no need for diagnosis. Then they said they can install a new thermostat for $350. What a rip off! I checked other local A/C service providers and they mostly charge $150 per hour for A/C services. Install a new thermostat may be the simplest service and can be done in half an hour. Not to mention that this is to fix an issue that should not happen in just 2 years. What a rip-off! I am really regret that I installed my A/C system with Costco. I trusted COSTO too much. I assume the service provider sele