We have that same setup in this house the we purchased in Parker. Works great and saves a ton on the electric bill. Just serviced it and installed new pads yesterday.
Don't worry about it. If its cooling your doing good. Change the filter every 3 months, oil the motors if they have a place to put oil and wash the condenser coil when needed. (Quarterly) Shut off the a/c breaker when you wash the coils, wait 20 to30 mins before turning back on.
To check the...