Most comfort complaints are not the equipment. They are duct leakage, a badly sized system, or a thermostat placed somewhere that misreads the house. We measure before we quote.
Sizing is done with a load calculation
An oversized system short-cycles, never pulls humidity, and wears out early. We run a proper Manual J rather than matching whatever was in the closet before, which is how a house ends up with the same problem twice.
Maintenance that is actually worth it
Two visits a year, coil cleaning, refrigerant verification, and a written record of readings so drift is visible over time rather than discovered in August.