Heat Pump Repair, Tune-Up & Installation

Common Heat Pump Problems and What They Mean

A heat pump is an air conditioner that can run backwards, so it has everything an AC has plus two parts an AC does not: a reversing valve and a defrost cycle. Most heat pump faults are one of those two, or the same refrigerant and airflow issues any cooling system has.

Cool air in heating mode. Usually the reversing valve, the component that flips the refrigerant flow between heating and cooling. When it sticks partway the system runs but delivers the wrong temperature.

The outdoor unit is iced over and stays that way. Some frost in winter is normal and the defrost cycle clears it. Ice that never clears means the defrost control, the sensor or the reversing valve is not doing its part, and running through it strains the compressor.

Running constantly without reaching temperature. Refrigerant leaks are the usual cause. It can also be normal: below about 35 degrees an air-source heat pump works harder for less, which is what the backup heat strips exist for.

Enormous winter bills. Often the heat strips running when they should not, because the thermostat or a sensor is telling the system it needs emergency heat. Resistance heat costs several times what the heat pump costs to run, so this is worth chasing down.

The system will not switch modes at all. Reversing valve or thermostat wiring. Worth troubleshooting properly, because replacing a thermostat that was never the problem is a common waste.

What Heat Pump Repair Costs

Repair cost tracks the part, and heat pumps have a wider spread than most equipment. A thermostat, a defrost sensor or a capacitor is at the low end. A reversing valve is labor-heavy because the refrigerant has to come out and go back in. A compressor is at the top and is usually the point where replacement enters the conversation.

Refrigerant is the variable that catches people out. Finding and fixing a leak is a real repair; recharging without finding it is not, and on an older unit the refrigerant itself can cost more than the labor.

You get the diagnosis, the price and the honest view on whether the repair is worth it before any work starts.

Repair or Replace

Heat pumps run about ten to fifteen years here, working both seasons rather than one, which is why they wear faster than a furnace does.

Repair while the unit is under twelve years, the fault is a single component, and it is holding temperature the rest of the time. Start pricing a new heat pump when the compressor has failed, when a reversing valve job lands on a unit already past its age, or when this is the third repair in two years.

If the house has ducting problems or rooms that were never comfortable, replacement is also the moment to ask whether ducted is right at all. A ductless mini-split solves the additions and converted spaces that a central system was never sized for.

Frequently Asked Questions

Why is my heat pump blowing cold air in winter? If it is brief and the outdoor unit is steaming, that is the defrost cycle and it is normal. If it is constant, the reversing valve is the first suspect.

Should the outdoor unit run in winter? Yes. A heat pump pulls heat from outside air even in the cold, which is why the outdoor unit runs year round. That is normal, and it is the difference between a heat pump and an air conditioner that sits idle from October.

What is auxiliary or emergency heat? Electric heat strips that assist when it is too cold for the heat pump alone. Occasional use is by design. Constant use means something is wrong and your bill will show it.

Do heat pumps work in Missouri winters? Yes, and modern ones considerably better than the reputation suggests. They lose efficiency in a hard freeze, which is what the backup heat covers, and they do the rest of the season for less than a furnace.