Mini-Split Maintenance & Annual Service in Des Moines, IA
A ductless mini-split system runs quietly in your finished basement, bedroom, or addition—but it still needs care. Unlike central AC with furnace filters to remind you, mini-splits are easy to neglect. Your wall-mounted indoor unit has a filter that collects dust, your outdoor compressor coil accumulates debris, and your refrigerant system can develop slow leaks that go unnoticed until efficiency drops. Obsidian Heating and Cooling has been maintaining ductless mini-split systems in Des Moines homes since 2009. We're a veteran-owned business and Tempstar Elite Dealer, and we believe that annual maintenance keeps your mini-split running efficiently and prevents expensive repairs. We'll clean your filters, inspect your coils, verify your refrigerant charge, and give you confidence that your zone comfort system is ready for another year.
Up to 15-Year Warranty
Parts & Labor
Why Mini-Split Maintenance Matters—Even for Zone Systems
Schedule Your Annual Mini-Split Maintenance
Don't let your zone system become a forgotten appliance. One annual visit catches problems early and keeps your system efficient:
Related Services:
What Happens During Your Mini-Split Maintenance Visit
From initial assessment to final documentation, every step is designed to keep your ductless system running efficiently and prevent costly repairs.
Pre-Service Review & Scheduling
When you contact us to schedule mini-split maintenance, we ask: How's your system performing? Have you noticed any changes in cooling or heating, noise level, or efficiency? How often have you been cleaning the filter? This helps us prepare and alerts us to any developing issues you might have noticed.
We schedule maintenance annually—ideally in spring for cooling-season preparation or fall for heating-season readiness, depending on your climate and system type. For year-round mini-split systems, we often recommend a single annual visit in spring or early summer when most homeowners are thinking about cooling. We'll accommodate your schedule and confirm an appointment window that works.
What We Cover
Performance Review
Current system performance and efficiency concerns.
Filter History
Filter maintenance history and usage patterns.
Service Records
Equipment details and previous service records.
Convenient Scheduling
Appointment time convenient for your family.
Tool Preparation
Diagnostic tools and cleaning equipment prepared.
Safety Check & Preliminary Inspection
Our technician arrives with diagnostic tools and begins with a safety assessment. We check for refrigerant leaks around the indoor unit (visible oily spots), verify electrical connections are secure and corrosion-free, and assess whether there are any visible hazards. We also visually inspect the wall-mounted indoor unit for dust accumulation, the outdoor unit for debris or coil blockage, and the condensate drainage system for blockage or backup.
We also check the remote control—does it respond? Are buttons responsive? We note any error codes or warning lights on the unit's display. This visual and preliminary check often reveals problems before we move to the testing phase.
Safety Assessment
Leak Detection
Check for visible refrigerant leaks or oily residue.
Electrical Connections
Inspect electrical connections for corrosion or looseness.
Indoor Unit Assessment
Filter condition and dust accumulation evaluation.
Outdoor Coil Check
Evaluate for debris, algae growth, or blockage.
Condensate Drainage
Verify condensate drainage is flowing freely.
Remote Control Test
Test remote control response and unit display function.
Filter Cleaning & Coil Inspection
The indoor unit's filter collects dust, pollen, and debris over months of use. We remove the filter, assess its condition, and clean it with compressed air and gentle washing. A clean filter improves airflow, reduces dust recirculation, and prevents the indoor coil from freezing. If the filter is too damaged to clean effectively, we'll recommend replacement.
We also inspect the indoor evaporator coil for dust and biological growth. Over a year, moisture and particles create an environment where mold and bacteria can grow. We'll clean the coil with appropriate methods—gentle enough not to damage fins, effective enough to restore heat transfer. The outdoor condenser coil is also inspected and cleaned if needed—dust and pollen accumulation significantly reduces efficiency.
Cleaning Process
Filter Cleaning
Remove and clean the indoor unit's filter thoroughly.
Filter Assessment
Assess filter condition and recommend replacement if needed.
Indoor Coil Inspection
Inspect the indoor evaporator coil for dust and biological growth.
Coil Cleaning
Clean the indoor coil if necessary.
Outdoor Coil Service
Clean the outdoor condenser coil with specialized equipment.
Airflow Verification
Verify all vents and air passages are clear and unblocked.
Refrigerant System Pressure Testing & Leak Detection
Proper refrigerant charge is critical. We attach gauges to the outdoor unit's service ports and measure current pressures under load. For mini-splits with long line sets (the small copper tubes connecting indoor and outdoor units), we account for the extra line volume in our pressure interpretation. If pressures are low, we use electronic leak detectors to identify any slow leaks developing in the system.
Most mini-split systems develop slow leaks over time—not dramatic failures, but gradual refrigerant loss that reduces efficiency. Detecting these early prevents catastrophic failures and allows us to discuss repair options before the system stops working. We'll document baseline pressures so future maintenance visits can track whether charge is stable.
Testing Process
Pressure Measurement
Measure low and high refrigerant pressures at the outdoor unit.
Line Set Accounting
Account for line set length in pressure interpretation.
Temperature Testing
Measure temperature differential to assess cooling or heating function.
Electronic Leak Detection
Use electronic leak detection if pressures are low.
Findings Discussion
Discuss any low-charge findings and repair timeline options.
Baseline Documentation
Document baseline pressures for future reference.
Electrical Component Testing & Control Verification
The electrical side of a mini-split includes the compressor, outdoor fan, reversing valve solenoid (if applicable), capacitor, and control board. We test each component. We use a multimeter to measure voltage at critical points. We use a dedicated capacitor tester to assess capacitor health—a failing capacitor shows no symptoms until it suddenly fails and the system stops working.
We also test the wireless remote control link—can the remote communicate with the indoor unit? Does it respond immediately to button presses? We verify that the control board is properly activating components. We test the outdoor fan to confirm it's spinning freely and pulling air properly. Each component tells us whether the system is healthy or developing problems.
Electrical Testing
Voltage Testing
Test voltage at the compressor, outdoor contactor, and transformer.
Capacitor Testing
Test the run capacitor with a dedicated meter for early failure signs.
Control Board Verification
Verify the control board is responding to remote signals.
Fan Motor Testing
Test the outdoor fan motor for proper operation and airflow.
Reversing Valve Test
Verify the reversing valve solenoid (if applicable) is energizing.
Thermostat Accuracy
Confirm thermostat accuracy and control response.
Line Set & Condensate System Inspection
The refrigerant line set—the small insulated copper tubes connecting indoor and outdoor units—should be secure, properly supported, and undamaged. We inspect the insulation for cracks or deterioration, which would allow heat gain (in cooling) or heat loss (in heating). We also verify the lines are properly sloped and supported so they don't sag or kink, which would restrict refrigerant flow.
The condensate system is equally important. The indoor unit produces water during operation—that water must drain through the condensate line to the outdoors or to an interior floor drain. We verify the drain line is flowing, clear of blockages, and properly graded so water doesn't back up into the unit. A clogged drain line causes water leaks from the indoor unit.
Inspection Points
Line Set Insulation
Inspect the line set insulation for cracks or deterioration.
Line Support
Verify the refrigerant lines are properly supported and not kinked.
Line Set Routing
Assess line set routing for proper slope and accessibility.
Condensate Flow Test
Test the condensate drain line for clear flow.
Condensate Pan
Verify condensate pan is clean and draining properly.
Concerns Discussion
Discuss any line set or drainage concerns.
Findings, Recommendations & Documentation
Once inspection and testing are complete, we walk you through our findings. We explain what we cleaned, what we tested, what pressures and readings mean, and what we're recommending for next steps. You'll receive a detailed service report with all measurements, what we cleaned, what we tested, and recommendations for any additional work.
If we identified any developing issues—a slow leak, a capacitor showing early failure signs, slightly elevated pressures—we'll discuss timeline and cost. We'll recommend your next maintenance appointment (typically one year away) and discuss options for joining our maintenance plan for automatic annual service and priority emergency support.
Service Completion
Findings Review
Review all findings and explain what we cleaned and tested.
Written Report
Provide a detailed written service report with all measurements.
Repair Discussion
Discuss any developing issues and repair timeline options.
Monitoring Guidance
Explain what to watch for until your next service appointment.
Next Appointment
Schedule your next annual maintenance visit.
Maintenance Plan
Discuss joining our maintenance plan for automatic scheduling.
Mini-Split Maintenance Service Throughout Des Moines
We provide annual mini-split maintenance service across Des Moines and surrounding communities.
Serving Our Neighbors in & Around:
Not Sure If We Service Your Area?
We're dedicated to serving Greater Des Moines and our surrounding communities. Give us a call if you're not sure if we come to you—chances are we do.
Ankeny, IA
North metro Des Moines mini-split owners trust us for annual maintenance and filter service. We schedule efficiently across Ankeny's neighborhoods.
Mini-Split Maintenance in AnkenyUrbandale, IA
We provide maintenance service throughout northwest Des Moines and Urbandale. Our technicians are familiar with the area's climate and every housing type.
Mini-Split Maintenance in UrbandaleAltoona, IA
Southeast of Des Moines, we schedule annual mini-split maintenance for homeowners who want to protect their zone comfort investment.
Mini-Split Maintenance in AltoonaGrimes, IA
North of Des Moines, Grimes residents join our maintenance plan for automatic annual service. We maintain fast scheduling across the area.
Mini-Split Maintenance in GrimesClive, IA
West of Des Moines, we serve Clive's neighborhoods with consistent, reliable mini-split maintenance that keeps systems efficient year-round.
Mini-Split Maintenance in CliveSupport Your Mini-Split with Related Services
Beyond annual maintenance, we offer complete mini-split support.
Mini-Split Repair & Emergency Service
If something goes wrong, we diagnose and repair quickly.
Get Emergency Mini-Split RepairMini-Split Installation & Replacement
If your system is aging or failing, we install new efficient ductless systems.
Explore Mini-Split InstallationCentral AC Maintenance
If you also have central AC, we maintain both systems.
Schedule AC MaintenanceHeat Pump Maintenance
Similar inspection and testing procedures apply to heat pump systems.
Get Heat Pump MaintenanceIndoor Air Quality Service
Improve filtration and humidity control alongside your mini-split.
Improve Your Indoor Air QualitySchedule Your Annual Mini-Split Maintenance Today
Your ductless mini-split system works quietly in your space, but it still needs care. Annual maintenance keeps it efficient, prevents costly repairs, and extends its lifespan by years. Obsidian Heating and Cooling makes mini-split maintenance simple and affordable.
Our veteran-owned team has been maintaining Des Moines-area mini-split systems for 15 years. We're Tempstar Elite Dealers with manufacturer training and direct factory support. Whether you need a single annual tune-up or want the convenience and peace of mind of our maintenance plan, we're here to help you keep your zone comfort system running at peak efficiency.
Frequently Asked Questions About Mini-Split Maintenance
Explore All Mini-Split Services
See everything we handle for mini-split systems, or jump straight to a related service.
