A gray outdoor heat pump unit on a concrete pad beside a dark horizontal-siding wall, with a small electrical box on the wall, shrubs and a concrete walkway to the right at dusk.

Get your heat pump to the right pro

What a heat pump tune-up covers in Illinois

Since most Illinois homes heat with gas, a heat pump running your heat and your AC is less common here, and a tune-up means different things depending on which job it's doing that day. This page covers what a thorough check looks like for both sides. If you'd rather hand the search off, you can get matched with a contractor who takes it from here.

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A heat pump tune-up checks both sides of the machine, since it heats your house in winter and cools it in summer. In summer, that means checking refrigerant charge, the condenser coil, and the fan motor, the same things a central AC tune-up covers. In winter, it means checking the reversing valve, the defrost control, and the outdoor coil for ice, since a heat pump that can't defrost itself properly will run constantly trying to keep up and your electric bill will show it. A technician also checks the thermostat settings and airflow through the ducts, since a heat pump moves more air than a furnace does to do the same job. Because Illinois winters push the system hard and summers here get sticky enough to run the AC side just as hard, a heat pump works more months of the year than most home AC or furnace units do, and skipping a season of maintenance shows up faster.

An older man with gray hair, a dark coat and scarf dusted with snow stands in a warmly lit entryway with an open wooden door, a table lamp, framed pictures, and a plant in a vase.

An older man with gray hair and a beard wearing a dark snow-dusted coat stands in a home entryway, with a lamp-lit living room and a wooden staircase behind him.

An older man with gray hair and a beard, wearing a dark snow-dusted coat, stands in a warmly lit home entryway with a hallway, console table with lamp, patterned rug, and living room visible behind him.

A gray-haired bearded man in a dark snow-dusted coat and scarf stands inside a dimly lit home entryway, with a hallway, framed picture, lit table lamp and staircase behind him.

Two systems in one cabinet

A gas furnace only has one job. A heat pump runs your heat and your AC, so a tune-up means checking twice the parts in one visit.

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The reversing valve

This is the part that switches the unit between heat and cooling. It only exists on a heat pump, and a furnace tune-up never touches it.

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Is your heat pump struggling to keep up either way

Watch for ice building up on the outdoor unit in winter that doesn't melt off during the day. Listen for the system running long stretches without the house ever feeling warm or cool enough. Notice a weak flow of air from the vents, or the system blowing air that isn't quite hot enough in January or quite cool enough in July. A hiss or a puddle near the outdoor unit is worth a look too. Since this one machine carries your heat all winter and your AC all summer, a problem that goes unchecked costs you twice, once in comfort and once on a power bill that's already high in Illinois.

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A summer dew point averaging 63°F across June, July and August, per NOAA, means the air itself is heavy with moisture, not just hot. Your heat pump has to pull that moisture out of the air before the house actually feels cool, on top of dropping the temperature. That's more work than a dry 85 degree day asks of it. A tune-up that checks refrigerant charge and airflow matters more here than it would somewhere dry, since a system running low on charge or short on airflow will struggle to wring the moisture out, and you'll notice it as a house that's cool enough by the thermostat but still feels damp.

NASA POWER T2MDEW county cells weighted by homes

A gray outdoor condenser unit on a concrete pad beside a white horizontal-siding house, with refrigerant lines and conduit running to a wall-mounted disconnect box, bare soil in front and a green shrub at left. — A clean condenser like this one moves summer humidity out of the air without a fight, and switches over to heat mode just as easily.

An outdoor air conditioning condenser unit on a concrete pad beside a house with light horizontal siding and a concrete block foundation, with bare soil and small green plants around it. — Dust packed into the fins and grille makes the unit work harder to move air, in July and in January alike.

What a Tech Actually Checks

A tech checks refrigerant charge in both directions, since too little or too much hurts heating and cooling alike.
The defrost cycle gets tested by forcing the outdoor coil into defrost and timing how long it takes to clear.
Electrical connections at the compressor and reversing valve get tightened, since a loose connection there can strand the system in one mode.
The crankcase heater gets checked, since it keeps refrigerant from pooling in the compressor during cold Illinois nights.
Airflow across the indoor coil gets measured, because weak airflow forces the system to run longer in both July and January.
The outdoor unit gets checked for level footing, since a tilted pad can throw off drainage when the unit defrosts.

A heat pump tune-up starts with the charge. A tech connects gauges and checks refrigerant levels going both ways, since too little charge or too much hurts the unit whether it's making cold air in July or pulling heat out of cold air in January. Next comes the defrost cycle. The tech forces the outdoor coil into defrost and times how long it takes to clear, because a slow defrost means ice building back up before the cycle finishes. Electrical connections at the compressor and the reversing valve get checked and tightened. A loose connection there doesn't just cause a breakdown, it can strand the system in heat mode during a heat wave or in cooling mode during a cold snap. The crankcase heater gets tested too. Its job is keeping refrigerant from pooling in the compressor overnight when temperatures drop, and a heater that's failed quietly can lead to compressor damage that shows up months later. Airflow across the indoor coil gets measured with the system running, since weak airflow makes the system run longer to hit the same temperature, in summer and winter both. Last, the tech looks at the outdoor unit's footing. A pad that's settled or tilted throws off how water drains away when the unit defrosts, and that water can refreeze into ice around the base.

Power costs 17.67 cents per kilowatt-hour statewide

A heat pump runs on electricity for both jobs, heat and AC, so every cent on that rate matters twice as much as it would for a furnace. At 17.67 cents a kilowatt-hour, a dirty coil or a low charge that makes the unit run longer shows up fast on your bill.

EIA-861 2025 statewide residential average

A gray outdoor condenser unit on a concrete pad beside a beige vinyl-sided house, with a wall-mounted disconnect box, flexible conduit, mulch bed, shrubs and a concrete walkway in front.

Running clean

This unit sits clear on its pad, lines and conduit intact, nothing blocking the grille. Air moves through the coil the way it should, so the unit isn't working any harder than it needs to in July heat or a January cold snap.

A weathered gray outdoor condenser unit on a concrete pad beside a house with horizontal vinyl siding, with conduit, refrigerant lines, and an electrical disconnect box on the wall behind it.

Choked with grime

Dust and grime have built up across the grille and top panel, with dead leaves piled against the base. That buildup blocks airflow across the coil, so the unit strains to pull humidity out of summer air and struggles to pull heat from winter air.

An outdoor air conditioning condenser unit with a top fan grille sits on a concrete pad beside a house with horizontal siding and a concrete step. — Before you get your heat pump maintenance

A gray outdoor condenser unit on a concrete pad beside a house with horizontal lap siding, a conduit and disconnect box on the wall, a shrub with white flowers at right and evergreen foliage at left. — After you get your heat pump maintenance

Matched to your heat pump job

I'm done searching

A heat pump carries the full load for your house, your heat and your AC both running on electricity at 17.67 cents a kilowatt-hour. When one side of that machine is working harder than it should, there's no gas furnace picking up the slack half the year to hide it. You feel it in July when the house won't quite cool down, and you feel it again in January when the air coming out feels lukewarm and the unit won't stop running. Finding a contractor who actually works on heat pumps regularly, rather than one who mostly services gas furnaces and treats your system as an afterthought, takes some digging on your own. Send the request and that search becomes someone else's job instead of yours. A contractor who knows both sides of this machine gets matched to your address, and from there it's their call to reach out about what your system needs.

A white outdoor heat pump unit on a concrete pad beside a house with wood-slat siding and a large plain light-colored stucco wall, with paving stones in the foreground.

A tune-up skipped for years

The reversing valve sticks instead of switching clean. Refrigerant has drifted low without anyone noticing, so the system runs long and still falls short. Ice holds on the outdoor coil past noon in January. The electric strips kick in more than they should to cover what the heat pump can't, and that cost shows up at 17.67 cents a kilowatt-hour on both your winter and your summer bill.

A white outdoor heat pump unit on rubber feet sits on a concrete pad beside a gray-sided house wall, next to a smooth light wall, gravel strip and lawn.

A tune-up kept current

The valve switches the moment the thermostat calls for it, no hesitation between heat and cooling. Refrigerant sits where it should, so the coil pulls summer humidity out of the air without straining and recovers heat in January without help from backup strips. The outdoor unit defrosts on schedule and gets back to work. The system runs the hours it's supposed to run, not more, and the bill reflects that.

Keeping Up With Maintenance, Or Behind On It

Tuned up on schedule

The reversing valve switches clean between heat and cooling, so you're not stuck waiting for the house to catch up either season.
Refrigerant charge sits where it should, which means the compressor isn't straining to hit temperature in July or January.
The outdoor coil stays clear, so defrost cycles finish on schedule instead of running long and wasting electricity.
Electrical connections get checked before a loose one causes a breaker trip during a cold snap or a heat wave.
The system pulls moisture out of the air in summer without running longer than it needs to.
Your electric bill reflects a unit doing its job once, not fighting itself twice a year.

Skipped a season or two

A sticking reversing valve means the unit may still be blowing cold air when you've switched it to heat.
Low refrigerant that's gone unnoticed makes both sides of the machine run longer for less result.
Ice on the outdoor coil that doesn't clear by afternoon in January is a sign defrost isn't working right.
A dirty coil makes the fan motor and compressor work harder in every season, not just the one you noticed trouble in.
Electric strips kick in more than they should to cover for a heat pump that isn't keeping up on its own.
At 17.67 cents a kilowatt-hour, a system working harder than it needs to shows up on your bill before you see any other sign.

Technician shuts down power to the outdoor unit first.
Outdoor coil gets washed clean of dirt and grass clippings.
Refrigerant charge gets checked with gauges on the lines.
Reversing valve gets cycled to confirm it switches clean.

A woman wrapped in a thick wool blanket sits in an armchair with an open book on her lap, beside a lit lamp and a frost-patterned window.

A woman in a cream knit sweater sits in an armchair indoors, eyes closed and smiling, beside a window showing yellow and orange autumn foliage, with a mug on a wooden side table and shelves holding vases behind her.

A woman in a gray sweater and jeans stands in an open wood front door of a white stucco house while a man in a dark jacket walks toward her on the entry path.

One machine, two jobs, checked both ways

A heat pump tune-up means someone checks the refrigerant charge, the reversing valve, the defrost cycle, and the electrical connections, because your unit has to switch between heat and cooling without missing a beat. Skip it and the signs show up as ice that won't melt off in January or a house that never quite feels right in July. Keep up with it and the reversing valve switches clean, the charge sits where it should, and the compressor isn't straining to do either job.

If you're not sure where your own system stands, that's worth finding out before the next change of season catches it off guard. Submitting your information here means a contractor who works on heat pumps in Illinois reaches out to you directly, with your situation in hand, so you're not the one tracking someone down.

A light-colored ceramic vase holding green leafy branches sits on a round wooden table, with a wooden-framed armchair draped in a cream throw, a tripod floor lamp, and sheer curtains blurred in the background.

An outdoor air conditioning or heat pump condenser unit on a concrete pad beside a gray horizontal-sided house, with a disconnect box and conduit on the wall and dark shrubbery to the left.

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