Hmm, checks out to be a 22+ seer system according to the google search I did. Frigidaire is a brand licensed by Nordyne for Air Conditioning. The latest version is 24.5 seer.
The system is designed to slow down and run at a fraction of it's capacity using a fraction of it's normal power consumption instead of shutting off. It runs constantly to keep the temperature at thermostat setpoint. It doesn't have the high startup energy consumption created by multiple starts and stops. This isn't your grandmother's air conditioner.
I had a customer with the same complaint with a Trane two stage heat pump during the winter. He purchased the home from the family who had it installed.
It wasn't too hot or too cold. It just never shut off. It would maintain temperature and drove the guy nuts because he expected it to shut off. He never had high power bills, just continuous comfort.
Is it getting too dry in your house or colder than setpoint? Have you had higher electricity bills than your neighbors with similar homes?