Deljo’s Heating & Cooling In Northbrook, Illinois HVAC, Air Conditioner & Furnace Services

Responded to service call for American Standard air conditioning system experiencing short cycling and frequent starting/stopping intervals. Upon arrival, performed diagnostic evaluation of outdoor condensing unit and electrical components. Inspection revealed compromised electrical connections at contactor assembly with visible discoloration and heat damage to terminals. Replaced defective contactor, cleaned and tightened all electrical connections, and verified proper wire integrity. Tested system operation through multiple cooling cycles to confirm unit runs continuously without short cycling. System now operating within normal parameters with proper run times and temperature differential.

Completed preventive maintenance agreement service on residential HVAC system including Carrier furnace/air handler and outdoor condensing unit. Performed comprehensive inspection of electrical components in outdoor unit control panel, verifying proper operation of capacitor and contactor assembly with all color-coded wiring connections secure. Replaced 16x20x1 air filter at indoor air handler, inspected condensate drainage system, and documented equipment condition with photos for maintenance records.

Completed comprehensive maintenance agreement service on two air conditioning systems. Performed system diagnostics, replaced air filters with 16x20x1 and 20x25x1 filters, and verified proper operation of Honeywell ProSeries thermostat displaying 67°F. Inspected Lennox furnace and air handler unit, checked refrigerant lines, electrical connections, and PVC intake/exhaust vents for proper function and condition.

Responded to no cooling complaint in guest room. Upon inspection, found air filter heavily loaded with debris restricting airflow to affected zone. Replaced dirty 16x25x1 filter with new filter. Verified proper airflow restoration to all registers and confirmed cooling operation throughout home. System operating within normal parameters.

Responded to warranty callback for recently installed 4-ton, 2-stage air conditioning system to address excessive noise levels, loose duct tape, and voltage drop causing lights to dim at startup. Inspected installation, documented system measurements and ductwork clearances, and secured loose tape connections. Discussed soft start kit installation option to reduce inrush current and eliminate light dimming issue during compressor startup.

Responded to service call for leak from air conditioning unit. Upon arrival, found evidence of refrigerant leak at indoor evaporator coil connections with oil residue present. Performed leak detection using electronic leak detector and identified active leak at brazed joint near filter drier. Recovered remaining refrigerant from system, repaired leak through proper brazing techniques, pressure tested system to 350 PSI with nitrogen to verify integrity of repair, evacuated system to 500 microns, and recharged unit to manufacturer specifications. Verified proper system operation with temperature split of 18 degrees across evaporator coil and confirmed all pressures within normal operating range. Cleaned condensate drain line which showed signs of biological growth and recommended improved maintenance schedule to prevent future issues. Outdoor condenser unit operating normally with proper airflow, though vegetation encroachment noted and customer advised to maintain clearance for optimal

Responded to callback for recently installed 4-ton two-stage air conditioning system to address excessive noise, loose duct tape, and voltage drop causing lights to dim at startup. Inspected electrical connections, capacitor, and contactor assembly; secured all wiring and verified proper installation of components. Documented control board and electrical panel configuration with photos for quality assurance purposes.

Conducted site assessment for adding one supply register to bedroom and relocating existing vents. Inspected existing ductwork routing and accessibility, photographed current system configuration including exposed duct runs and interior register locations, and evaluated feasibility of requested modifications. Compiled material list for proposed work.

Completed comprehensive cooling system maintenance agreement service on residential Energy Wise air conditioning unit. Performed standard inspection protocol including visual examination of condenser unit exterior condition, verified proper installation on pad, checked refrigerant lines and electrical connections, and confirmed operational status of all components. Filter size 20x25x4 was noted as not included in service agreement and customer will need to supply separately for replacement.

Evaluated 22-year-old air conditioning system with R22 refrigerant leak and provided replacement estimate for AC unit only. System located at ground level with easy access, existing furnace and ductwork to remain in place.

# HVAC Service Report - Cooling System Repair Responded to no-cool complaint on 15-year-old residential air conditioning system. Upon arrival, performed comprehensive system inspection including visual examination of outdoor condensing unit components and indoor air handler. Inspection revealed aging electrical components in outdoor unit, including contactor and capacitor showing signs of wear and corrosion on mounting surfaces. Multiple wire connections were inspected and found secure, though unit exhibited typical wear patterns consistent with system age. Capacitor tested and found within acceptable operating parameters despite visible age-related surface deterioration. Investigated reported pipe leaking concern by examining refrigerant lines, condensate drainage system, and all visible plumbing connections throughout the system. Inspected copper refrigerant lines running from outdoor unit to indoor air handler for signs of refrigerant leaks, corrosion, or moisture accumulation.

Responded to third callback for AC unit not cooling properly. Upon arrival, inspected multi-zone HVAC system control board (HZ311 zone controller) and verified all zone wiring connections, LED indicators, and system operation modes. Checked Honeywell digital thermostat displaying 69°F setpoint in cooling mode with Wi-Fi connectivity enabled. Diagnosed and resolved persistent cooling issue by addressing control board communication fault between zone controller and thermostat. Tested all three zones for proper airflow and temperature response. System now operating within normal parameters with all zones cooling effectively.

Responded to no cooling call and discovered attic-mounted condenser unit experiencing active refrigerant leak with significant water damage to interior ceiling and walls below. Upon inspection, found extensive corrosion on evaporator coil and copper refrigerant lines, with rust-colored oxidation and debris accumulation throughout the heat exchanger fins. Documented water intrusion damage in stairwell area showing brownish-gray discoloration pattern on walls and ceiling, confirming condensate leak had been penetrating through multiple floors. Recommended immediate system evaluation for coil replacement and proper condensate drain line repair to prevent further structural damage.

Responded to service call for upstairs air conditioning system not cooling properly, an ongoing issue with a six-year-old unit. Upon arrival, inspected the Honeywell ProSeries thermostat which displayed system operating in cooling mode with a setpoint of 74°F and current temperature reading of 66°F at time of inspection. Accessed the air handler unit and observed significant moisture accumulation and condensation throughout the interior compartment, with water droplets visible on metal surfaces and evidence of corrosion staining along seams and panel edges. Examined the refrigerant lines, blower motor housing, and internal components. Documented system conditions with photographs showing excessive moisture presence within the unit, which indicates potential drainage issues, airflow restrictions, or refrigerant system problems requiring further diagnosis and repair to restore proper cooling function and prevent continued moisture-related damage to the equipment.

Responded to no cooling complaint on AC unit. Upon arrival, verified thermostat operation and confirmed system functionality by measuring supply air temperature at 56.8°F, indicating proper cooling performance. Educated customer on normal system operation and thermostat programming.

Provided comprehensive estimate for complete air conditioning system replacement including new condenser and evaporator coil. Presented three-tier pricing options featuring Carrier equipment: Good tier with up to 14 SEER, Better tier with up to 17 SEER, and Best tier with up to 19 SEER for improved energy efficiency. Documented existing attic-mounted HVAC system including ductwork configuration, flexible ducting connections, and current installation layout to ensure proper sizing and compatibility for replacement equipment.

Responded to a low water pressure complaint at an outdoor ground-level spigot on a 16-year-old home. Upon inspection, found the existing hose bib mounted to the exterior brick wall showing signs of age and potential internal deterioration affecting flow rate. Evaluated the spigot assembly, including the valve body and connection integrity, and documented the condition with photographs. Also inspected interior plumbing connections beneath bathroom sink to rule out supply line issues affecting overall household water pressure.

Completed replacement of residential air conditioning condenser unit and evaporator coil system. The installation required a two-technician crew working approximately half a day to remove the existing components and install new equipment. All refrigerant lines, electrical connections, and condensate drainage systems were properly configured and tested to ensure optimal system performance and compliance with manufacturer specifications.

Completed preventative maintenance on Carrier condenser unit as part of annual HVAC agreement. Inspected outdoor unit condenser coils showing weathering and dirt accumulation, verified refrigerant line connections, and examined control board wiring and electrical components inside air handler compartment. All system controls, circuit boards, and wiring connections found secure and operational during inspection.

Conducted comprehensive assessment of existing residential HVAC system located in basement utility area for full system replacement quote. Evaluated current furnace unit, ductwork configuration including galvanized metal plenum and flexible ducting sections, condensate pump assembly with PVC drainage lines, and overall mechanical room layout. Documented equipment condition showing age-related wear, dust accumulation on duct components, and existing installation configuration with water heater proximity. Photographed complete system setup to provide detailed visual reference for replacement specifications and equipment sizing requirements.