Heat Pump Repair in Lake Havasu City: What a Desert Summer Leaves Behind

Why Havasu heat pumps break when the weather turns

Most homes in Lake Havasu City heat with a heat pump, either a split system with an air handler inside or a rooftop or ground-level package unit. That same machine just spent five months running hard in some of the hottest weather in the state. Summer heat is rough on equipment, and a few things tend to wear out in that stretch:

• Capacitors. Heat is the main thing that kills a run capacitor. One that weakened in August may still limp along in cooling, then fail to start the compressor or fan on a cold morning.
• Contactors. Every time the system starts, the contactor closes. After a summer of constant cycling, the contact points can pit and burn until they stop making a good connection.
• Dirty coils. Desert dust, blowing sand and cottonwood fluff pack into the outdoor coil. A clogged coil makes the heat pump work harder in both seasons and can make it ice up more often in winter.
• Heating-only parts. The reversing valve and the defrost control barely do anything in summer. The first time you switch to heat is the first time they have been asked to work in months.
• Refrigerant leaks. Vibration and heat can open small leaks at fittings and coils. A system that is a little low on refrigerant may still cool, but it heats poorly and freezes up.

Add a house that sat closed up all summer while its owners were out of state, and you have a lot of systems that get their first real test the same week. That is why repair calls pick up once Havasu nights drop into the 40s.

Safe checks you can do before you call

1. Thermostat. Confirm it is set to Heat, not Cool or Auto, and set a few degrees above room temperature. Swap the batteries if the screen is faint or blank.
2. Give it a few minutes. Many thermostats and heat pumps have a built-in delay of up to five minutes before the outdoor unit starts.
3. Filter. Pull it and hold it up to the light. A clogged filter cuts airflow, which makes a heat pump blow lukewarm air and can trip safeties. In Havasu dust, check it monthly.
4. Breakers. Heat pumps usually have two breakers, one for the outdoor unit and one for the air handler and heat strips. Check both. Reset a tripped breaker once. If it trips again, leave it off and call.
5. Outdoor unit. Look from a step back. Clear leaves, plastic bags or yard debris from around it, keep about two feet of open space, and make sure the fan is not blocked. Light frost that clears on its own is normal. A solid block of ice is not.
6. Supply vents and returns. Make sure furniture, rugs or storage boxes are not covering registers or the return grille.

Stop there. Do not open electrical panels, poke at the capacitor, hose down a running unit, or chip ice off the coil. A capacitor can hold a dangerous charge even with the power off, and the coil fins bend and puncture easily.

What the common symptoms usually mean

• Outdoor fan does not spin, unit hums. Very often a failed capacitor or a stuck fan motor. Turn the system off and call so the compressor is not left straining.
• Indoor blower runs, outdoor unit does nothing. Could be a burned contactor, a tripped breaker, a low-voltage wiring problem or a control issue.
• Air is cool or barely warm, and the bill jumped. The heat strips may be carrying the load because the heat pump side is not. Low refrigerant, a stuck reversing valve or a dirty coil are the usual suspects.
• Outdoor unit stays iced over. A defrost control, sensor or refrigerant problem, or a coil packed with dirt. Some frost is normal. Ice that never clears is not.
• Blows cold air all the time in heat mode. The reversing valve may not be shifting, or the thermostat wiring is crossed. Common on the first heat call of the season.
• Loud grinding, banging or a burning smell. Shut it off at the thermostat and call. Do not keep running it.

What happens when we come out

You get the service call price on the phone before we head your way. On site, the technician checks the thermostat and wiring, tests the capacitor and contactor, watches the outdoor fan and compressor start, checks refrigerant pressures in heat mode, confirms the reversing valve shifts, runs the defrost cycle and checks the backup heat strips. You get a plain explanation of what failed and the repair price before any work starts. The diagnostic is credited toward the repair when you approve it.

Many heat pump repairs are a common part, like a capacitor, contactor, fan motor or defrost board, and they are often finished in one visit. If the system has a major refrigerant leak, a failed compressor, or it is old enough that repairs keep stacking up, we tell you straight and put repair and replacement side by side. Replacement estimates are free and there is no pressure to decide on the spot. As a Trane Comfort Specialist we install Trane heat pumps and package units, and we service the other major brands too. Financing is available on approved credit. Learn more on our heating repair and heat pump replacement pages.

Rooftop and package units in Havasu

Many Havasu homes have a package heat pump on the roof or on a pad beside the house, with everything in one cabinet. Those units take the full sun and wind all year. The cabinet panels, roof curb seals and duct connections can loosen or crack, letting in hot air and dust in summer and leaking heat in winter. If you have a rooftop unit, please do not climb up to look at it. Let us check it from the roof with the right gear.

Keep the next cold snap from catching you

A yearly tune-up is the cheapest way to avoid a no-heat call. Our seasonal tune-up is $79, limited time $69 through December 31, 2026. It covers testing the capacitor and contactor, cleaning the outdoor coil, checking refrigerant pressures, running the defrost cycle and checking the heat strips and airflow. Our maintenance plans cover a heating visit in the fall and a cooling visit in the spring, which fits the way Havasu systems are used.

Related reading: why a heat pump blows cold air in winter, a snowbird checklist for leaving and coming back to Havasu, and when it is time to replace a heat pump.

Common questions

My heat pump cooled fine all summer. Why won't it heat now? Heating mode uses parts that sit idle all summer, like the reversing valve, the defrost control and the backup heat strips. A capacitor or contactor that was barely hanging on through the heat can also give out on the first cold start. Cooling fine in September does not mean heating will be fine in November.

Is it normal for steam to come off the outdoor unit? Yes, in short bursts. On cold mornings the outdoor coil frosts over and the heat pump runs a defrost cycle to melt it. You may see steam and hear a whoosh when it switches. That is normal. A unit that stays caked in ice for hours, or never seems to clear, needs a look.

Should I just turn on emergency heat? Only as a stopgap. Emergency heat runs the electric heat strips alone, which costs a lot more to run. It can keep the house comfortable until we get there, but it is not a fix. If the heat pump side has stopped working, call so we can find out why.

I am a snowbird and just got back. Should I have it checked before I need heat? It is a good idea. A house closed up all summer in Havasu gives dust, nesting critters and heat a long run at the system. A tune-up when you get back catches worn electrical parts and clogged coils before the first cold night. Our seasonal tune-up is $79, limited time $69 through December 31, 2026.

Will I know the cost before you start? Yes. You get the service call price on the phone before we head your way. The technician explains what failed and prices the repair before doing any work, and the diagnostic is credited toward the repair when you approve it. If replacement is worth considering, the estimate is free.

Air-Exx Heating Cooling and Ventilation LLC is a veteran-owned company serving Lake Havasu City, Bullhead City, Fort Mohave, Kingman and the rest of Mohave County, plus Prescott and Yavapai County. A live person answers 24 hours a day, Monday through Saturday. Heat pump not heating? Call (928) 565-6440 or text (928) 227-8441 to book heat pump repair in Lake Havasu City.