A service call is a trip to a house or business establishment at which a technician diagnoses the cooling or heating system(s). After having done this, he presents options, advises the customer, and quotes on a repair(s), a system replacement, or both.
Why would someone set up a service call? Because something is believed not to be working properly, or that something is failing, or has failed, with the unit…
Some common reasons for a service call are as follows: There is no/insufficient cooling or no/insufficient heating; a strange smell is coming from the unit; a unit is rattling or making an odd or unusual sound/noise; the unit won’t shut off; air is not reaching a certain part of the conditioned space; the home/business owner is experiencing high electric bills.