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Why Is My NV Energy Bill So High in Summer? A Failing AC in Las Vegas

In Las Vegas, air conditioning is usually the largest part of a summer power bill, so an AC that has to run longer to do the same job shows up fast on your NV Energy statement. A low refrigerant charge, a struggling compressor, and dirty coils are the most common reasons a system runs long. On September 25, 2026, we visited a Las Vegas home in the 89149 ZIP after an NV Energy visit flagged a likely refrigerant leak and the homeowner wanted a second opinion. Testing found a failing compressor and a failing expansion valve on the 5-year-old system, and the homeowner chose a new 3-ton Trane system.

What We Found

The outdoor unit was a 3-ton, 16 SEER condenser from a Trane value brand, about 5 years old and running on R-410A. With gauges connected, the system showed 1.5 degrees of superheat and subcooling just below zero. On a healthy system with this kind of valve, both numbers usually land somewhere around 8 to 12 degrees. Those readings lined up with what the tech found: a compressor that was failing and a TXV (the valve that meters refrigerant into the indoor coil) that was failing too, on top of the suspected leak.

A system in that shape still runs, but it moves less heat for every hour it runs. On a Las Vegas summer afternoon, that means longer cycles and more power for the same thermostat setting.

How We Fixed It

Laid out two paths: repair the compressor and TXV on the existing system, or replace the system.
The homeowner chose replacement: a 3-ton Trane XR14 split system with an 80% gas furnace, a new condenser, and a matching multi-position indoor coil.

How it turned out

The homeowner chose to replace the outdoor unit, indoor coil, and furnace together, so every major part tied to the failing compressor, valve, and suspected leak gets replaced at once. The record doesn’t include bills from before or after, so we won’t put a number on the savings.

Can a failing AC raise my electric bill?

Yes. A system that’s low on refrigerant or has a weak compressor moves less heat per hour, so it runs longer to hold the same temperature. In July and August, that can mean near nonstop run time on the hottest afternoons. A bill that jumps with no change in your habits, plus longer run times or warmer rooms, is worth a check. See why ACs fail early in Las Vegas.

How do I tell the AC from the heat?

Some summer increase is normal. Signs the equipment is the problem: the system runs all day without reaching the setpoint, the air from the vents feels less cold than it used to, or you see ice on the refrigerant lines.

Should I repair or replace?

When a compressor and an expansion valve are both failing and there’s a suspected leak, a repair replaces most of the expensive parts anyway. Our full system replacement guide explains how to weigh it.

Safety note: HVAC repairs involve high voltage, refrigerant and, on gas furnaces, combustion gases. Leave them to a licensed technician.

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