Sudden High Energy Bills in Millwood, WA

There are several mechanical failures that cause an AC to run longer and harder without cooling better. Here's what we look for and why each one drives up your costs.

Refrigerant Leak

Refrigerant is the substance that absorbs heat from inside your home and releases it outside. When the refrigerant level drops - due to a slow leak in the coil or refrigerant lines - the system loses its ability to transfer heat efficiently.

The result: the compressor runs almost continuously trying to compensate, and your home still feels warm. Your bill climbs while your comfort drops.

Dirty or Restricted Condenser Coil

The outdoor unit (condenser) releases heat from your home into the outside air. When the condenser coil is coated with dirt, cottonwood, or debris, it can't shed heat efficiently.

The result: the system runs longer each cycle, using more electricity to do the same job. This is one of the most common causes of a sudden bill spike after a dusty spring.

Failing Capacitor

Capacitors are small electrical components that give the compressor and fan motors the jolt they need to start and keep running. A capacitor that's weakening - called a "soft failure" - doesn't stop the motor entirely. It just makes the motor work harder to start and run.

The result: higher electrical draw on every cycle. The motor drags through each start instead of firing cleanly. Over a full summer, that adds up fast.

Frozen Evaporator Coil

The evaporator coil sits inside your air handler and absorbs heat from your indoor air. If airflow across that coil is restricted - by a clogged filter, a closed vent, or a blower problem - the coil temperature drops below freezing and ice forms on it.

The result: a frozen coil can't absorb heat at all. The system runs continuously, moving almost no cool air, while your bill spikes.

Aging Builder-Grade Equipment

Millwood has a mix of older homes near the Millwood Historic District and a wave of construction from roughly 15 to 20 years ago. That second group - homes built during the early 2000s building boom - were often fitted with builder-grade AC units. Many are now at or past their expected service life.

A unit installed at 13 SEER efficiency and now 15 years old may be operating at a fraction of its original efficiency. It's not broken - it's just worn out. That gradual efficiency loss shows up directly on your utility bill.

Duct Leaks

Leaky ductwork lets conditioned air escape into unconditioned spaces - attics, crawl spaces, wall cavities - before it reaches your living areas. The system keeps running to hit the thermostat setpoint, but a significant portion of the air it produces never gets there.

The result: longer run times, higher bills, and rooms that never quite cool down.

Before you call, run through these checks. Some of them are quick fixes. All of them give us useful information when we arrive.

• Check your air filter. A gray, clogged filter restricts airflow across the evaporator coil. Replace it if it's been more than 60–90 days. A clean filter won't fix a refrigerant leak, but it rules out the simplest cause.
• Look at the outdoor unit. Is the condenser coil packed with cottonwood, leaves, or debris? Is there at least 2 feet of clearance around the unit? Restricted airflow forces the system to work harder.
• Check your vents. Make sure supply and return vents throughout the house are open and unblocked by furniture or rugs.
• Look at the indoor unit. If you can see the evaporator coil (usually behind the filter panel), check for ice. Ice on the coil means restricted airflow or low refrigerant - both need professional attention.
• Check your thermostat settings. Confirm it's set to "cool" and "auto" - not "on," which runs the fan continuously regardless of cooling demand.