Package Unit Maintenance & Tune-Up in Worth, IL

Package units sit fully outside, so weather protection is our first priority. Our technician arrives with a weather-seal assessment kit and visual inspection checklist. We examine the unit's cabinet for corrosion, rust, or gaps where water could enter. We check all ductwork connections for loose fasteners and cracked gaskets. We clear accumulated leaves, dirt, and debris from coil surfaces and exhaust vents. We verify that the unit's drain pan has proper slope and clear drainage. We test all weather seals on access panels and refrigerant ports. A clean, weather-tight package unit runs reliably and avoids water intrusion, electrical hazards, and rust damage.

• Inspect cabinet exterior for corrosion, rust, dents, and paint damage
• Check all ductwork connections for tightness and gasket integrity
• Examine refrigerant port seals and valve corrosion
• Clear coil fins, intake grille, and discharge louvers of debris
• Inspect drain pan for cracks, blockages, and proper slope
• Check all fasteners and weatherstripping for tightness
• Verify exhaust vent termination and clearances
• Test water resistance of cabinet seams and access doors
• Document weather-related wear patterns for future planning

The refrigerant charge must be exact on both heating and cooling sides. We measure pressure at service ports with calibrated gauges, calculate superheat (cooling mode) and subcooling (heating mode), and verify operation against OEM nameplate specifications. If pressure is off, we investigate for leaks—the usual cause of charge loss—repair leaks found, and recharge to specification. We inspect refrigerant lines for cracks, corrosion, or loose connections. We test the reversing valve (heat pump function on dual-mode units) to ensure it switches cleanly between heating and cooling.

• Measure refrigerant pressure on suction and discharge sides
• Test superheat (cooling) and subcooling (heating) values
• Inspect refrigerant tubing for leaks, corrosion, and damage
• Check service port seals for signs of past leaks
• Test reversing valve operation (if dual-mode unit)
• Verify refrigerant line insulation is intact
• Measure compressor discharge temperature
• Confirm refrigerant expansion device operation
• Document pressure trends for future maintenance planning

Package units carry significant electrical load—wrong voltage, loose connections, or failing capacitors can cause shutdown or component damage. We test incoming electrical supply, measure voltage and amperage to the compressor, condenser fan motor, and blower motor. We test the capacitor (or capacitors, on larger units) for microfarads rating and leakage. We verify the thermostat signal reaches the unit correctly and that the defrost cycle (on heat pump units) engages properly in heating mode. We check all safety interlocks and limit switches for correct operation. Healthy electrical systems keep package units safe and reliable.

• Verify incoming electrical supply voltage and phase balance
• Test capacitor(s) for correct microfarads and leakage
• Measure compressor motor voltage, amperage, and direction of rotation
• Test condenser fan motor and blower motor operation under load
• Check thermostat signal transmission and response
• Verify defrost cycle engagement (heat pump heating mode)
• Test all limit switches and safety shutoffs
• Inspect wiring for loose connections and corrosion
• Check all breakers and disconnect switches for proper function
• Document electrical baseline for future comparison

A complete maintenance includes testing both functions. For cooling, we measure temperature drop across the evaporator coil (should be 12–18°F) and verify condenser fan operation. For heating (furnace-only or heat pump units), we measure temperature rise across the heat exchanger, check burner operation and flame pattern (on gas-fired units), and verify gas pressure and safety controls. On heat pump units, we test both heating and cooling cycles in the same visit. This dual-function verification ensures your year-round comfort system works at full efficiency.

• Test cooling cycle: measure evaporator temperature differential
• Verify condenser fan operation and airflow
• Measure heating cycle temperature rise across heat exchanger
• Test burner ignition, flame pattern, and combustion (if gas unit)
• Measure gas pressure and verify regulator operation
• Test thermostat mode switching (heating ↔ cooling)
• Verify fan blower operation on both cycles
• Check ductwork for balanced airflow throughout premises
• Measure system delivery temperature and return air temperature
• Confirm both cycles reach and hold setpoint temperature

Before we leave, we provide a detailed written maintenance report showing inspection results, test data, and what we cleaned or adjusted. We'll explain in clear language what the pressure, temperature, and electrical readings mean, alert you to any aging components we've noticed, and recommend when maintenance should occur next. We'll discuss any repairs or component monitoring needed, give you an upfront estimate if work is recommended, and answer all questions about your system's condition. No surprises, no mystery charges—just honest information and professional recommendations.

• Deliver itemized service report with all inspection and test results
• Explain pressure, temperature, and electrical readings in plain language
• Identify any components showing wear or aging
• Recommend component replacement timeline based on findings
• Provide clear guidance on next maintenance visit timing
• Discuss seasonal adjustments and filter replacement schedule
• Explain any safety concerns or operational anomalies
• Provide warranty information and service history documentation
• Answer all questions about system operation and efficiency
• Encourage maintenance plan enrollment for priority scheduling