Highland Park Home AC System Issues

Highland Park homeowners often encounter a range of air conditioning issues during intense summer heatwaves and highly variable spring weather patterns. Frequent problems include refrigerant leaks reducing cooling efficiency, frozen evaporator coils caused by restricted airflow, aging compressors struggling with humidity control, and electrical failures in outdated thermostats or capacitors. Clogged condensate drains from seasonal pollen and summer dust storms also routinely trigger unexpected shutdowns or damage home interiors. Understanding these common AC malfunctions helps residents promptly identify symptoms requiring emergency repair service.

Refrigerant Leaks

Refrigerant leaks pose a frequent challenge for Highland Park homeowners, compromising AC efficiency and indoor comfort. These leaks occur when Freon escapes through tiny cracks or corrosion in coils, lines, or connections, causing insufficient cooling despite the system running constantly. Low refrigerant levels force compressors to overwork, potentially leading to costly failures if neglected. Since refrigerant is hazardous and requires licensed handling, professional detection using electronic leak detectors or ultraviolet dye is critical. Prompt repair of leaks and proper recharge by certified technicians ensures environmental compliance, restores optimal performance, and prevents long-term damage to your Highland Park air conditioning system.

Frozen Evaporator Coils

Frozen evaporator coils unexpectedly halt Highland Park home cooling, often due to restricted airflow that traps cold refrigerant inside the coils instead of absorbing heat. Common culprits here include clogged air filters, failing blower fans, and dirty condenser units struggling in our humid summers. Low refrigerant levels also starve the system, causing pressure imbalances that facilitate ice buildup.

Ignoring this frosty buildup risks expensive consequences: pressure-cracked coils, severe water damage to walls and ceilings, or compressor burnout from overheating. If you discover ice, immediately shut off your AC and run just the fan to encourage gentle thawing before calling a specialist.

Maintain your system effectively for our climate: replace filters monthly, seal ducts properly, trim plants away from outdoor units, and arrange professional tune-ups before summer. Address reduced airflow or poor cooling immediately to prevent frozen coils and protect your Highland Park HVAC.

Electrical Control System Malfunction

Electrical control failures rank among the disruptive AC issues homeowners in Highland Park encounter, potentially causing inconsistent cooling, system shutdowns, or complete unit malfunctions. These failures often stem from issues within the complex network of wiring, capacitors, contactors, or circuit boards governing your cooling system’s operation. Addressing these electrical faults promptly is critical to avoid cascading damage and ensure reliable Highland Park AC performance during hot spells.

• 
  
• Failed capacitors causing weakened compressor or fan motor starts
  
• Corroded or pitted contactors interrupting power flow
  
• Frayed wires causing short circuits or fire risks
  
• Damaged relays preventing component activation
  
• Defective circuit boards causing signal misreads or operational failures
  
• Thermostat wiring faults signaling erroneous commands
  

Dirty Condenser Coils

Dirty condenser coils pose a frequent challenge for air conditioning systems in Highland Park homes, reducing efficiency and increasing wear. These coils, located in the outdoor unit, release heat from refrigerant into the air, but layers of dust, pollen, and debris act as insulation that traps heat. This forces your AC to run longer cycles, spikes energy bills, and strains components like compressors. Regular professional cleaning during seasonal maintenance is essential to maintain peak performance in Highland Park's demanding summers.

Nearby lawns, gardens, and trees introduce airborne debris that rapidly dirties AC coils. If your system blows warm air, struggles to cool, or raises energy bills unexpectedly, schedule a coil inspection immediately. Professional cleaning restores performance, prevents expensive repairs, and prolongs your unit's life.

Essential AC Repair Services Offered

Essential AC repair services in Highland Park address critical cooling system failures with precision and urgency. Experienced technicians diagnose refrigerant leaks, compressor malfunctions, electrical failures, and airflow obstructions common in local climate demands. Timely interventions restore optimal indoor temperatures while preventing minor issues from escalating into costly breakdowns during peak summers.

Diagnostic Testing

Proper diagnostic testing forms the core of reliable AC repair services in Highland Park. Skilled technicians use specialized tools to identify electrical irregularities, refrigerant leaks, and airflow restrictions within your system.

Thorough system diagnostics evaluate compressor performance, thermostat calibration, and condenser/evaporator integrity. Such targeted analysis reveals concealed problems deeper than observable indications.

Technicians perform pressure readings, temperature differential checks, and component load testing to uncover root causes of inefficiency or failure. Advanced thermal imaging may detect ductwork leaks hidden within walls or attics.

Comprehensive diagnostics ensure precise repairs by avoiding unnecessary part replacements. This process restores cooling efficiency and documents system health for ongoing reference.

Compressor Repairs

Essential AC repair services in Highland Park include comprehensive compressor diagnostics and repairs for residential and commercial systems.

Technicians identify compressor failures caused by electrical faults, refrigerant issues, or mechanical wear, performing precise repairs like motor replacements, valve fixes, and burnout recoveries.

Services extend to compressor protection through capacitor testing, hard-start kit installations, and refrigerant level corrections to prevent future breakdowns.

All repairs include system performance testing to ensure cooling efficiency restoration and compressor longevity in Highland Park's climate.

Ductwork Assessment and Sealing

Highland Park residents rely on professional ductwork inspection and sealing to maintain efficient AC systems. Technicians meticulously examine ducts throughout your home, identifying leaks, gaps, and disconnections hidden in attics, basements, or crawlspaces that let cooled air escape. This diagnostic step pinpoints energy waste and uneven cooling.

Specialized sealing follows, using mastic sealant or metal-backed tape to permanently close breaches in duct joints and seams. This prevents conditioned air loss, reduces strain on your AC unit, and lowers utility bills. Proper sealing also minimizes dust infiltration, improving indoor air quality while ensuring consistent temperatures in every room.

Together, these vital solutions boost Highland Park AC effectiveness by addressing ductwork problems commonly missed in standard upkeep. They repair ventilation pathways, prolong equipment lifespan, and deliver significant energy savings for local comfort.

Thermostat Calibration

Highland Park's critical AC repair services utilize comprehensive thermodynamic diagnostics to detect cooling deficiencies. Certified technicians evaluate refrigerant charge, validate compressor functionality, and examine electrical components for peak system operation in high-heat conditions.

Thermostat calibration forms a critical component of HVAC maintenance. Experts recalibrate digital and mechanical units to achieve accurate temperature readings, eliminating inconsistencies that cause overcycling or insufficient cooling. They verify sensor functionality and program settings alignment for both conventional and smart home systems.

Comprehensive service packages address airflow obstructions within ductwork and condenser coils. Specialists clear debris from external units and evaporator coils while lubricating motors to prevent overheating. This proactive approach reduces strain on compressors and extends equipment lifespan across all central air installations.

Electrical diagnostics identify failing capacitors or contactors before complete system failure. Technicians measure voltage fluctuations and inspect wiring integrity throughout safety circuits. Emergency services additionally restore cooling functionality for unexpected breakdowns during peak operational demand periods.

Emergency Repair Situations

Highland Park residents facing sudden air conditioning breakdowns understand the urgency of unexpected cooling failures during sweltering weather. Emergency repair situations demand swift, professional intervention to restore comfort and prevent extensive damage to HVAC systems. Trusted local technicians stand ready to tackle these critical AC malfunctions, offering rapid response solutions when relief can't wait.

Complete System Shutdown

An air conditioning shutdown in Highland Park during extreme weather is a critical emergency demanding immediate action to prevent property damage, serious health risks from heat, and expensive repairs. Such failures typically arise from urgent electrical problems, refrigerant leaks, or compressor malfunctions.

Residents of Highland Park must promptly shut down their unit via both thermostat and circuit breaker to eliminate electrical risks. Investigate basic issues such as flipped breakers or dirty filters, but never attempt complex part repairs yourself. Secure a licensed technician for safe, regulation-adhering service recovery.

Local AC repair teams in Highland Park prioritize these emergencies, offering 24/7 response to restore cooling swiftly. Their expertise addresses root causes, like seized motors or refrigerant loss, ensuring your system restarts reliably without recurring failures during peak demand. Prompt professional intervention minimizes downtime and protects your equipment investment.

Strange Noises or Smells

Immediate action is essential for Highland Park AC emergencies to avoid severe damage and maintain household comfort amid intense heat.

Unexpected system failures often stem from:

• 
  
• Compressor failures during peak temperature days
  
• Refrigerant leaks causing sudden cooling loss
  
• Circuit breakers tripping due to electrical faults
  
• Evaporator coils frozen due to restricted airflow
  

Unusual operational signs demand urgent diagnostics:

• 
  
• Grinding or screeching sounds signaling motor problems
  
• Buzzing sounds suggesting electrical arcing
  
• Persistent rattling from loose components
  
• Musty smells signaling mold in ducts
  
• Burning odors from overheating parts
• Chemical smells hinting at refrigerant leaks
  

Water Pooling Around Indoor Unit

Water pooling around your indoor AC unit in Highland Park demands immediate attention as a serious HVAC emergency. Ignoring this issue risks extensive water damage to ceilings, walls, and flooring in your home.

Clogged condensate drain lines are a frequent culprit, causing backed-up moisture from your air conditioner's dehumidification process to overflow. A malfunctioning condensate pump or frozen evaporator coils may also trigger leaks requiring urgent repair.

Immediately turn off your air conditioner at the thermostat to stop more water from gathering. DIY repairs on refrigerant lines or wiring are dangerous—leave these tasks to certified professionals.

Contact a Highland Park AC repair specialist promptly for emergency service. Trained professionals will diagnose the leak source, clear blockages, repair faulty components, and restore safe operation before structural damage or mold growth occurs.

Frequent Cycling or Inadequate Cooling

Experiencing an AC emergency in Highland Park demands immediate attention to prevent further damage and discomfort. Sudden system failures, unusual noises, or complete shutdowns often indicate critical issues requiring urgent professional repair to restore safety and cool air swiftly.

Short cycling, when an air conditioner starts and stops too quickly, indicates underlying issues such as refrigerant loss, faulty thermostats, or wiring problems. This inconsistent operation overworks the compressor and drives up electricity costs, necessitating immediate troubleshooting to prevent expensive part breakdowns in Highland Park's weather conditions.

Inadequate cooling—where your system runs but fails to lower indoor temperatures effectively—often stems from dirty coils, low refrigerant levels, or aging components. Persistent warm airflow requires expert assessment to identify the root cause and implement targeted repairs for efficient comfort restoration.

Choosing a Reliable Repair Provider

Securing a reliable Highland Park air conditioning repair specialist is vital for maintaining consistent comfort, safety, and energy savings throughout the year. Expert maintenance stops small problems from becoming expensive emergencies, especially during intense temperature swings. Opting for a certified, seasoned technician with local knowledge protects your financial commitment and household security by delivering precision service adapted to this region's unique weather patterns.

Local Experience with Highland Park Climate

Selecting a dependable repair provider for your AC unit in Highland Park demands thorough vetting to avoid subpar service and inflated costs. Prioritize certified, licensed technicians who offer transparent pricing, warranties on labor, and emergency availability to handle unpredictable summer breakdowns efficiently.

Local experience with Highland Park’s unique climate is non-negotiable for effective AC repairs. Providers familiar with area-specific issues like high humidity cycles, temperature spikes, and seasonal allergen loads can optimize system performance and longevity. They’ll know how to calibrate units for stifling heatwaves and recommend solutions suited to local architecture and weather patterns, ensuring your comfort year-round.

24/7 Emergency Availability

Locating a dependable Highland Park air conditioner repair service requires thorough vetting, particularly for vital around-the-clock emergency support. Begin by checking for NATE or HVAC Excellence credentials to confirm technician competence. Examine verified client testimonials that emphasize prompt after-hours response and actual crisis resolution skills.

Prioritize local Highland Park providers guaranteeing 24/7 availability without after-hours fees, verifying their emergency response times for nights, weekends, and holidays to minimize delays during sudden extreme heat.

Ask about upfront pricing transparency for emergency visits, avoiding hidden charges. Technicians should arrive fully equipped for most common AC failures, providing immediate diagnostics and solutions. Established businesses with local roots often deliver greater accountability and faster follow-up support during off-peak hours.

Ensure proper licensing and insurance, especially for intricate repairs. Reputable companies guarantee warranties covering both parts and labor across all services. Selecting a reliable 24/7 provider keeps your Highland Park residence comfortable amid any cooling emergency.

Written Estimates and Transparent Pricing

Finding a trustworthy AC repair provider in Highland Park requires careful evaluation to ensure quality service and fair dealing. Start by checking local technicians for proper licensing, insurance, and industry certifications, as these credentials indicate trained expertise.

Choose HVAC companies boasting consistently strong reviews across multiple platforms and seek neighbor recommendations; also, verify their specific expertise with your AC brand/model to avoid technicians inexperienced with your system's nuances.
Insist on a comprehensive written estimate detailing labor costs, parts prices, diagnostic fees, and potential extra charges before authorizing work. Avoid vague quotes or providers unwilling to furnish written estimates.

Question any estimate discrepancies immediately and seek clarification on warranty terms for both parts and labor. Transparent providers will readily explain pricing structures and potential variables, ensuring no unexpected costs arise upon job completion.

Technician Certifications and Training

Locating a dependable air conditioning replacement Gurnee, https://www.todoexpertos.com/usuarios/efrainsanford, conditioning repair service in Highland Park necessitates prioritizing technician credentials and continual training. Confirm licensing and brand-specific qualifications, as these reflect compliance with industry benchmarks and specialized knowledge of your equipment.

Specialized certifications like NATE (North American Technician Excellence) demonstrate advanced skills in HVAC diagnostics and repair, while commitments to regular training ensure technicians stay current with evolving technologies and refrigerants used in Highland Park homes.

**The Importance of Preventive Maintenance**

Preventative maintenance for your air conditioning system in Highland Park is essential for uninterrupted comfort during demanding seasons. Anticipating issues before failures occur protects your investment and minimizes costly emergency repairs. Scheduled tune-ups enhance efficiency, extend equipment lifespan, and maintain healthy indoor air quality for Highland Park homes. Proactive care ensures your AC reliably battles Piedmont heat while optimizing energy consumption and system performance year after year.

Semi-Annual Tune-Up Benefits

Consistent preventative care is crucial to your Highland Park air conditioner's lifespan and peak performance. Neglecting routine service causes clogged airflow, trapped dirt, and premature breakdowns during hot summers.

Here are rewrites:* Catching minor refrigerant leaks, electrical issues, or worn parts early through preventative care prevents them from escalating into costly breakdowns. This avoids expensive emergency fixes and keeps your system running when you need cooling most.* Preventative care catches small issues like refrigerant leaks, electrical faults, or worn components before costly failures occur. Minimizing emergency repairs and unexpected outages ensures cooling is available when essential.* By catching minor refrigerant leaks, electrical problems, or part wear early, comprehensive preventative care avoids expensive breakdowns, emergency repair costs, and outages during critical cooling times.

Twice-yearly maintenance tackles Highland Park's unique issues, such as limestone fragments clogging condenser coils or desert dust covering internal parts. Technicians adjust thermostats, measure refrigerant levels, and clear condensate drains to stop humidity-triggered mold, prevalent in our weather.

Optimized performance from seasonal maintenance reduces energy consumption by up to 15%, significantly lowering utility bills during peak cooling months. Well-maintained systems also maintain manufacturer warranties and operate more quietly while delivering consistent comfort all season.

Filter Replacement Schedules

Regular AC maintenance in Highland Park boosts system longevity and avoids mid-season failures. Filter changes are vital since dirty units strain compressors, speeding deterioration while cutting efficiency and air purity.

Most homes need new filters every 1-3 months, but pet owners, allergy sufferers, or properties near construction may require monthly changes. Businesses follow tighter schedules dictated by filter type and MERV ratings—high-efficiency models sometimes need quarterly replacement despite recommended lifespans.

During tune-ups, technicians evaluate airflow, static pressure, and visible dust to set your optimal frequency. Consistent tracking prevents missed changes, keeping filters effective at blocking contaminants before they damage coils and motors.

Coil Cleaning Procedures

Preventative maintenance is non-negotiable for AC systems in Highland Park's harsh temperatures. Neglecting it causes premature breakdowns during heatwaves, costly emergency repairs, and increased energy bills. Regular servicing preserves efficiency, extends equipment life by years, and maintains indoor air quality for homes and businesses in our local climate.

Maintaining clean coils is essential because contamination severely compromises HVAC efficiency. Dust buildup on evaporator coils impedes airflow and diminishes cooling ability, whereas outdoor debris on condenser coils forces compressors to overwork while increasing energy costs. Professionals first remove loose particles through vacuuming, then use specialized cleaners followed by gentle rinsing to preserve fin integrity. This meticulous process ensures peak thermal exchange, avoiding both ice formation on coils and electrical malfunctions.

Highland Park's seasonal maintenance plans combat wear from extreme summers and desert dust via scheduled coil cleaning, refrigerant checks, component inspections, and duct assessments—ensuring reliable AC operation and preventing 70% of common failures reported locally.

Overall System Efficiency Optimization

Preventative maintenance plays a critical role in preserving the longevity and functionality of air conditioning systems in Highland Park homes. Proactively addressing minor issues like refrigerant leaks or worn components before they escalate extends system lifespan and prevents inconvenient mid-summer failures.

Optimizing overall system efficiency through scheduled cleanings, coil inspections, and airflow assessments significantly reduces energy consumption. Well-maintained AC units operate with peak performance, lowering utility bills while maintaining consistent indoor comfort during Highland Park's hottest months.

Neglecting these vital services risks diminished cooling capacity, higher operational costs, and premature system replacement. Investing in regular professional maintenance safeguards both equipment efficiency and household comfort year-round.

Cost Factors for Repairs

Highland Park homeowners can better anticipate AC repair expenses by understanding key price factors: the unit's age and model, repair complexity, required parts, local labor rates, and seasonal demand peaks. Emergency services or component replacements often spur significant cost hikes, while regular maintenance can lessen future repair expenses.

Part Replacement Complexity

Highland Park AC repair expenses vary significantly due to multiple factors, and complex part replacements substantially impact pricing. These demanding jobs necessitate extended labor hours, specialty equipment, and expert skills, which immediately affect total costs.

• 
  
• Labor Intensity
  
  • Sealed system repairs (compressor, evaporator coil) necessitate EPA-certified technicians and refrigerant handling, leading to higher hourly rates
  
  
• Part Accessibility
  
  • Units in attics or crawl spaces complicate disassembly, prolonging service time
  
  Refrigerant Specifications
  
• Restoring lost refrigerant (R-22 vs. R-410A) involves substantial material costs
  Electrical Component Failures
  
• Diagnosing and repairing control boards or wiring faults demands advanced troubleshooting expertise.
  
• Scarcity & Sourcing
  
  • Obsolete parts for older units may need custom orders from suppliers
  
  

System Age and Model Specifications

To grasp Highland Park AC repair expenses, focus on unit details like age and model features.

• 
  The system's age
  
  • 
    
  • Older units (10+ years) frequently necessitate pricier repairs due to obsolete components requiring extensive sourcing or custom fabrication.
    
  • As aging systems lose efficiency, mechanical components experience greater stress, boosting failure risks for compressors or coils while requiring more diagnostic labor.
    Here are rewrite options:1. Obsolete refrigerants like R-22 face high reclamation costs and limited availability, sharply increasing repair expenses compared to modern options.2. Limited availability and high reclamation fees for outdated R-22 refrigerant significantly boost repair costs versus contemporary alternatives.3. Repair costs jump substantially with obsolete R-22 refrigerant due to exorbitant reclamation fees and scarce availability.4. Using outdated refrigerants such as R-22 incurs costly reclamation fees and scarce supply, driving repair costs far above modern alternatives.
    
  
  
  
• Model Specifications
  
  • 
    
  • Exclusive or retired models frequently depend on proprietary components from few suppliers, leading to extended wait times and higher costs for replacements.
    
  • Specialized technician training for advanced systems like variable-speed or ductless mini-splits incurs surcharges beyond standard repair labor rates.
    
  • High-SEER or smart-enabled units incorporate complex electronic boards and sensors, where component failures prove costlier to diagnose and replace than conventional models.
    
  
  
  

Seasonal Demand Fluctuations

AC repairs in Highland Park experience wide cost variations depending on crucial elements. Labor and component prices are primarily influenced by the problem's complexity—like compressor malfunctions versus refrigerant issues. Pricing is further affected by the system's age and installation accessibility, as older models may need rare parts and hard-to-reach setups increase service duration. Peak season emergency work often incurs additional fees.

Highland Park AC repair schedules and technician access shift significantly with seasonal peaks. During summer's intense heat, system breakdowns spike, overwhelming service capacity with lengthy waitlists and possible higher rates. Alternatively, cooler months feature expedited appointments and occasional special offers as businesses seek to balance workload during quieter times.

Diagnostic Fee Structures

As a trusted name, Optimized Air Heating and Cooling stands as the Round Lake area's top-rated HVAC specialist, offering dependable HVAC services to both residential and commercial properties throughout the Chicagoland suburbs. Our highly trained technicians specialize in complete HVAC solutions such as cooling repair services, heater replacements, air duct service, and emergency heating and cooling repairs.

With deep local roots working throughout Northern Illinois, Gurnee, and surrounding areas, Optimized Air Heating and Cooling has consistently delivered affordable pricing, excellent workmanship, and budget-friendly packages.

When you trust Optimized Air Heating and Cooling for your HVAC system services, you're counting on HVAC professionals who are familiar with the unique weather patterns in Lake County. Our full-service approach covers everything from preventative inspections and efficiency optimization to new installations and IAQ services.

We dedicate ourselves to any customer in the greater Round Lake area with day-or-night repair availability, guaranteeing your comfort year-round. Call Optimized Air Heating and Cooling now for a complimentary assessment on your climate control needs in Round Lake and beyond.

Understanding cost factors for AC repairs in Highland Park helps homeowners budget effectively. Repair expenses vary based on equipment complexity, part availability, and service urgency, with critical system failures often demanding higher investments for immediate resolution.

Diagnostic fee frameworks dictate technician approaches to system evaluations, usually incorporating:

• 
  
• Flat-rate diagnostics: Standardized charges regardless of repair timeframe
  
• Hourly rates: Fees based on time spent identifying the malfunction
  
• Fee waivers granted when homeowners proceed with recommended repairs
  After-hours premiums increase costs for emergency night and weekend diagnostics.
  
• Fee applies for combined heating and cooling system inspections
  

Labor intensity and regional pricing norms further influence final repair estimates, as skilled technician time contributes significantly to overall expenses in Highland Park's service market.

Warning Signs Requiring Urgent Service

When your Highland Park air conditioning system falters, ignoring warning signs can lead to costly breakdowns during sweltering weather. Recognizing critical symptoms that demand prompt professional AC repair prevents minor issues from escalating into emergencies, safeguarding your home's comfort and your equipment's longevity. Stay vigilant for these urgent indicators requiring immediate technician attention.

Warm Air or Weak Airflow

Feeling warm air blowing from vents instead of cool relief signals your Highland Park AC needs immediate professional attention. Weak airflow struggles to circulate properly, leaving hot spots and forcing your system to overwork.

Optimized Air
423 Windridge Dr
Round Lake Park, IL 60073
(224) 338-9591

If you notice barely any air movement despite the thermostat setting, suspect clogged filters, failing blower motors, or significant duct leaks. Ignoring weak airflow risks compressor damage and soaring energy bills.

Warm airflow frequently signals low refrigerant from leaks or compressor issues. Delaying repairs risks severe system damage and total failure during Highland Park's peak heat. Seek immediate service if your AC blows warm air instead of cooling.

Constant On/Off Cycling

If your air conditioner rapidly turns on and off without completing full cooling cycles in Highland Park, immediate professional service is essential. Constant short cycling strains components like the compressor and electrical system, accelerating wear while failing to properly cool your home. This pattern often indicates critical issues: frozen coils, refrigerant leaks, faulty thermostats, or malfunctioning pressure switches. Ignoring it risks costly breakdowns during Highland Park's hottest days and inflates energy bills due to excessive startup power draws. Contact an HVAC specialist promptly to diagnose and resolve the underlying problem before major damage occurs.

Spikes in Energy Bills

Sudden, unexplained surges in your energy bills frequently signal your Highland Park air conditioning system needs immediate professional repair. Aging components, refrigerant leaks, dirty coils, or failing motors force your AC unit to work overtime, consuming excessive electricity to maintain comfort. Ignoring this warning allows minor issues to escalate into costly breakdowns during Highland Park's hottest days.

Ice Formation on Components

Here are a few options:1. Ignoring ice on your AC unit risks costly repairs and safety dangers in Highland Park's climate.2. Immediate action on AC ice buildup prevents expensive breakdowns and hazards in Highland Park.3. To avoid costly breakdowns and safety issues in Highland Park, address AC ice formation promptly.

• 
  
• Thick frost or ice coating the refrigerant lines or outdoor unit
  
• Visible ice buildup inside the indoor air handler unit
  
• Unanticipated water pooling near indoor HVAC components
  
• Hissing or bubbling noises coming from refrigerant lines
  
• Cooling capacity decreased despite continuous system operation
  
• Full system shutdown with concurrent ice accumulation