5 Things to Know About Geothermal Heat Pump Maintenance

A geothermal heat pump does need maintenance, though usually less than a system with a fuel-burning furnace and an outdoor condenser sitting in the weather. The short list: keep the air side clean, have the loop fluid and pressures checked, look after the ducts, and pay attention to the buried piping. Most of the rest is having a qualified technician look the system over on a schedule.

Rather than a heater and air conditioner, a ground-source system moves heat to and from the earth through a loop of pipe and a fluid, and a compressor and heat exchanger inside the house do the rest. Fewer parts live outdoors, which helps, but the parts that do the work are still mechanical and still wear.

The installation sets the ceiling

How well a system was designed and installed shapes every maintenance question that follows. A loop that is too short for the house, poorly purged of air or badly connected will struggle no matter how carefully you look after the rest. If you bought a home with an existing system, ask for whatever paperwork exists about the loop layout, the fluid used and past service, because that history saves a technician time.

The loop fluid needs to be checked

Many ground loops use water mixed with an antifreeze solution so the fluid does not freeze in the coldest part of the cycle. Over the years the concentration and the pressure in the loop can drift. A technician can test both, top up the loop properly and spot the slow pressure loss that suggests a leak. This is not a home project, since the loop is a sealed system and the wrong mixture can hurt performance or damage the equipment.

Dirt and debris still find their way in

The air side of a geothermal system behaves like any other forced-air setup. The filter loads up with dust, and in the Tri-Cities that includes fine summer dust and, some years, wildfire smoke. A clogged filter cuts airflow, forces the blower to work harder and can leave the indoor coil dirty. Check the filter regularly and replace it as needed; for a standard 1 inch filter, every one to three months is a common rule of thumb.

The indoor coil and the drain that carries away condensation also collect grime. Cleaning them is part of a professional service visit.

Do not forget the ducts

Because the equipment is efficient at moving heat, it is easy to assume the whole system is fine when the real problem is a leaky or dirty duct. Disconnected joints, crushed sections and uninsulated runs waste conditioned air before it reaches a room. If some rooms are always uncomfortable or the house is dusty, the ducts are worth a look.

Buried piping is out of sight, not out of mind

The underground loop is meant to last for decades, which is exactly why it gets forgotten. You cannot inspect it, so pay attention to what the system tells you: falling pressure, a fluid that keeps needing top-ups, or heating and cooling that slowly weaken. Keep heavy equipment, trees with aggressive roots and new digging away from the loop field, and know where it runs before any landscaping project.

A yearly visit from a technician who knows ground-source equipment is the simplest way to catch small trouble early. They can check pressures, temperatures across the heat exchanger, electrical connections and the condition of the circulating pump.

Keep a simple log as well. Note the date of each service, the filter changes and any pressure or temperature readings the technician gives you. A few years of notes make it much easier to spot a slow decline, and they help whoever owns the house next.

If you have a geothermal system and are not sure who should look after it, call Air-Tech at (509) 392-2021 and ask.