What an HVAC Technician Actually Does on a Las Vegas Service Call

Most homeowners only meet an HVAC technician when the house is 95 degrees inside. Knowing what a proper service call looks like makes it easier to tell a thorough company from one that swaps a part and leaves. Here is the job, step by step, as the good companies in Las Vegas do it.

Before the visit

• The questions on the phone. What the system is doing, how old it is, whether it is a split system or a rooftop package unit, and whether anyone has worked on it recently. A good dispatcher asks these so the technician arrives with the likely parts on the truck.
• The arrival window. A real window, and a call or text when the technician is on the way. In a summer heat wave, honest companies tell you if same-day is not possible.

The diagnosis

• Thermostat and controls. Settings, batteries, wiring, and whether the thermostat is actually calling for cooling. A surprising number of "broken AC" calls end here.
• Electrical. Breakers, the disconnect, the contactor, and the capacitor, which is the single most common summer failure in the valley. Capacitors are tested with a meter, not guessed at.
• Airflow. Filter, blower, evaporator coil, and ductwork. A clogged filter or a frozen coil causes most "blowing warm air" complaints.
• Refrigerant. Pressures and temperatures on both lines. Low refrigerant means a leak somewhere; a technician who just adds refrigerant without finding the leak is selling you the same repair again next month.
• The outdoor unit. Condenser coil condition (Las Vegas dust packs them), fan motor, and compressor amperage.

The quote

You should get a written, flat price for the repair before work starts, with the part named, and a straight answer to "is this unit worth it." On systems over ten years old, ask for a replacement estimate on the same visit so you can compare.

The repair

Parts on the truck get done the same visit. Special-order parts (some coils, blower assemblies, control boards) take a day or more; ask whether a temporary fix is possible in the meantime. After the repair, the technician should run the system, re-check pressures and temperatures, and show you the old part.

What a maintenance tune-up includes

Twice a year in Las Vegas, spring for cooling and fall for heating: clean the condenser coil, check refrigerant charge, test the capacitor and contactor, tighten electrical connections, check the blower and belt, flush the condensate drain (clogged drains cause water damage and shutoffs every summer), test the thermostat, and for furnaces, inspect the heat exchanger and burners. Most companies sell this as a plan with priority scheduling in the summer rush, which is the main reason to buy it.

Replacement day

A replacement is a one-day job for a straightforward split system: remove the old equipment, set the new condenser and air handler or coil, connect refrigerant lines and electrical, pull a vacuum, charge, and test. The company pulls the mechanical permit (City of Las Vegas, Henderson, North Las Vegas, or Clark County depending on your address) and schedules the inspection. Keep the permit and the warranty registration; you will want both at resale.

What you should walk away with

• A written invoice naming the parts replaced and the readings taken.
• The warranty terms on the part and the labor, in writing.
• The company's Nevada State Contractors Board license number, which should also be on their truck and their website.
• A clear answer about how many summers your system has left.