When A Cold Snap Turned One Heat Pump Into A Money Pit

Marcy called on a Tuesday morning in January and opened with a number instead of a problem. Her power bill had landed at $410. November had been $180. Same house, same thermostat, same three people in it. She had already searched heating gig harbor wa twice that week and talked herself out of calling, because the house was not exactly cold. It was just never warm, and the vents blew air barely warmer than the room.

One Cold Snap Broke A Working Heat Pump

That week never climbed above 28 degrees for five straight days. Her heat pump was eight years old and had been unremarkable up to that point. In an ordinary Gig Harbor winter that is what a working system does, moving heat out of cool outside air and into the house cheaply. Below freezing the job gets harder, and every system has a point where the electric backup coils switch on. Marcy’s backup was not helping. It was doing the whole job, all day, while the compressor outside had gone silent without anybody noticing. That is the distance between a $180 month and a $410 month, and nothing in the house announces it except the bill.

Why Auxiliary Heat Ran All Day

Auxiliary heat is a bank of electric resistance coils in the air handler, there to cover the coldest mornings and then shut off. Ten years ago that gap was wide. Older pumps around Puget Sound gave up early and leaned on backup most of a cold week, so a big January bill looked annoying but not suspicious. Newer equipment holds its own much further down the thermometer, so a modern unit running on aux heat around the clock is a fault signal, not ordinary winter behavior.

In the utility closet the technician noticed a panel original to the house, with one breaker clearly reset more than a few times. Worth saying plainly, since it comes up often: a breaker that trips repeatedly is a warning, not a nuisance, and the fix is a licensed electrician, not another reset. Back to the heat pump, though, because the panel was innocent here.

The Diagnosis Behind The Rising Bills

The case we see most often is a defrost control that quit doing its one job, and that is what turned up in Marcy’s yard. The outdoor coil iced over, never cleared itself, and the system settled into backup and stayed there. Refrigerant was also a little low, a separate leak conversation for spring. Neither repair is exotic.

What made this one expensive was timing. Energy costs have been climbing on both sides of the Atlantic, and reporting in July 2026 tracked a 13% rise in the household energy price cap, to roughly £1,862 a year for a typical customer, while American households watched their own rates climb. A stuck backup heater costs more in 2026 than the identical fault cost in 2019. The fault was small. The bill was not.

What The First Week Of Repair Looked Like

Someone was out the same day, which is the part that matters during a cold snap. The first day is diagnosis, plus either pulling a defrost board and sensor off the truck or ordering them. Within 7 days most repairs like this are finished and the pump carries the load again instead of the coils. By month two the bill tells you whether the fix held. Marcy’s February came in at $246, March at $198, about where a Gig Harbor winter should sit.

Questions That Would Have Caught It Sooner

Her last maintenance visit was two winters earlier, from a company that has since stopped answering its phone. She is not unusual in that. Most people book a heating contractor the week something breaks, and ask about price and arrival time. A few sharper questions, asked back in October, would have found the defrost fault before the cold arrived.

● Do you actually test the defrost cycle on a heat pump, or only check the refrigerant charge? A good answer describes forcing a defrost and watching the reversing valve change over.

● How would I know if my auxiliary heat is running more than it should? A good answer points at a specific thermostat readout or a monitoring setting, not a vague promise to keep an eye on it.

● What is your response time during a cold snap, and does it change on a weekend? A good answer is a number of hours.

● If the repair does not hold, what is covered and for how long? A good answer names a written workmanship guarantee with an actual term attached to it.

Comfort And Bills Six Months Later

Six months on, the pump is still the pump. Repair beat replacement by a wide margin, as it usually does when the equipment is under ten years old and the failure is a control board rather than a dead compressor. Replacement math shifts with fuel type and age, though. ENERGY STAR rates certified gas furnaces at up to 15% more efficient than baseline models, worth about $120 a year in energy savings, real money, and still rarely enough on its own to justify scrapping a working system.

The lesson here is cheap to copy. Watch the bill month over month rather than the thermostat, because a heat pump can fail politely, blowing lukewarm air for weeks while the backup coils quietly do all of the work. Anyone comparing options for heating gig harbor wa homes should ask about the defrost cycle by name. That one question separates a real tune-up from a filter change with an invoice attached.