Heat Pump Repair in Hermann, MO

Frost, ice or cold air: reading the symptom

Light frost on a heat pump in cold weather is normal. A solid shell of ice is not, and neither is a house that stops gaining temperature. Find your row below, then give us that symptom on the phone.

A DOE-hosted homeowner guide says a defrost cycle usually takes 5 to 15 minutes, and that fans may slow while auxiliary heat runs. A unit stuck in defrost or covered in ice is a service call, not a wait-and-see.

Why central Missouri winters are hard on heat pumps

BestPlaces counts about 116 freezing nights a year in Hermann, and the average winter low sits near 24°F. DOE's contractor guide says standard air-source heating efficiency drops once it is below about 35°F. So most winter nights here fall in the band where the machine leans on defrost and backup heat, which is where weak parts get exposed.

• Damp cold near freezing. River-valley mornings around 32°F load a cold coil with moisture, so defrost runs over and over. A drifting sensor or tired board fails on those days first.
• Roof water and snow. A unit under an eave or valley gets rewetted between cycles. Ice then builds faster than defrost can clear it.
• All-electric homes. Past the gas main, strip heat is often the only backup. A failed outdoor unit shows up on the electric bill before the house feels cold.
• Dual-fuel farms. With a propane furnace behind the heat pump, the house stays warm when the heat pump quits. You may only notice when the tank level drops much faster than last winter.

How do we diagnose a frozen or weak heat pump?

We start at the thermostat and work outward, because a miswired stage can look exactly like a dead compressor. Then we measure the temperature rise at the supply and return, read amp draw on the compressor and fan, check the coil sensor and read the refrigerant circuit.

The key test is forcing a defrost. It shows whether the board calls for the cycle, whether the reversing valve shifts, whether the outdoor fan stops and whether the coil actually clears. That one test separates a bad sensor from a bad valve.

Repair options for a failed defrost board, valve or compressor

Most faults have more than one fix, and the right one depends on the unit's age. We lay out the choices and you make the call.

• Defrost board repair or sensor swap. Small parts, usually a short visit, and the right answer on a unit with years left.
• Capacitor, contactor or fan motor. These electrical parts wear faster on a heat pump than on an AC, because the machine runs in both seasons.
• Reversing valve. The parts are not the main cost. Labor is, since the charge must be recovered, the valve brazed out and the system evacuated and recharged.
• Refrigerant leak. Worth chasing on a newer system. An older outdoor coil with a leak often has another one coming, and R-22 units rely on reclaimed supply.
• Compressor. The largest repair. Past about 15 years, price it against a new heat pump before you say yes.

What is included in a heat pump repair in Hermann

Every visit should leave you with a named fault, a price and a working system. Here is the order we follow.

1. We get the story from you, then check thermostat mode and staging.
2. We check the filter, indoor airflow and auxiliary heat.
3. We open the outdoor unit and test electrical components.
4. We force a defrost and watch the valve, fan and coil.
5. We put gauges on the system once the electrical side passes.
6. We name the failed part and quote the repair before starting.
7. We make the repair, then run heat and defrost to confirm both work.

If a part has to be ordered, we will say so before we leave. Emergency heat or a dual-fuel furnace can carry the house in the meantime, though strip heat will show on your bill. Read the model number off the outdoor unit when you call (209) 563-1270, because it tells us the age, the refrigerant and what to load before we leave Hermann.

What does heat pump repair cost?

Fixr's national figures, updated January 2026, put the average repair at $400, with most jobs from $150 to $650. These are national numbers, not our prices.

Other guides run far higher on reversing valves and compressors, so treat those two rows as a floor. Angi's 2026 number for St. Louis labor is $125 to $150 an hour. Access, refrigerant type and how far we drive all move the bill, so get a clear, upfront quote from us before deciding.

Why Brian Grannemann Services for heat pump repair

• A heat pump fault can be electrical, refrigerant or airflow. Electrical work is on our Google profile too, so a burned disconnect or strip heat circuit stays with one company.
• We service the furnace side as well, which matters on a dual-fuel system where the changeover is part of the problem.
• Our office at 124 E 10th St has been a Hermann fixture since 1998, with a staffed front desk on weekdays.
• Stephanie H. says Brian "shows up when promised," which counts when you are waiting on heat.
• Google shows 4.7 stars from 15 reviews, checked November 2026.

Heat pump maintenance that prevents the next no-heat call

Give the outdoor unit two feet of open space, change filters on schedule and never wrap the cabinet in winter, because it needs airflow to pull heat. Fix any gutter that drips on it, and keep drifted snow off the base. Our guide to why heat pumps freeze up covers the warning signs, and a fall heating tune-up catches a slow defrost before the first hard freeze.

We cover the Hermann area and beyond from our office, including Berger, Morrison, New Haven and Owensville. If the house is losing heat fast, start with our emergency furnace repair page.