For over 100 years, Deljo Heating and Cooling has been the trusted name for HVAC services in Deerfield, IL. Whether you need heating, cooling, or indoor air quality solutions, our expert technicians ensure your home stays comfortable all year long. We offer furnace service, air conditioning repair, and complete maintenance solutions tailored to your needs.
Why Choose Deljo Heating and Cooling?
- Certified Technicians & Industry Partnerships: Our team is NATE-certified and Carrier-authorized, ensuring high-quality service and equipment.
- Flexible Financing Options: We offer financing plans to make HVAC upgrades and repairs more affordable.
- Special Offers & Promotions: Check our website for seasonal discounts and promotional offers on heating, cooling, and plumbing services.
- Local Expertise: We understand the specific HVAC and plumbing challenges Deerfield homeowners face.
- Preventative Maintenance Plans: Enroll in our maintenance plans to keep your HVAC system running efficiently and avoid costly repairs.

Heating Services in Deerfield
Winters in Deerfield can be brutal, and a reliable heating system is essential to keep your home warm and safe. Deljo Heating and Cooling provides professional heating solutions, including:
Furnace Installation & Replacement
If your furnace is outdated or inefficient, our team can help you select and install a furnace. We install energy-efficient furnaces that maximize comfort while reducing heating costs.
Furnace Repair in Deerfield, IL
A malfunctioning furnace can leave you in the cold. Our licensed technicians offer 24/7 emergency furnace repair to diagnose and fix issues quickly. If your furnace isn’t heating properly, making strange noises, or cycling frequently, contact us for immediate service.
Furnace Maintenance
Routine furnace maintenance helps extend the life of your heating system and ensures it runs efficiently. Our furnace service in Deerfield, IL includes a full inspection, filter replacement, and system tune-up to prevent breakdowns.
Boiler Services
In addition to furnaces, we offer boiler repair, installation, and maintenance. If you rely on a boiler for home heating, our technicians can keep it running smoothly throughout the winter.

Air Conditioning Services in Deerfield
When summer temperatures rise, you need a reliable air conditioner to stay cool. Deljo Heating and Cooling offers expert AC services in Deerfield, IL to keep your system operating at peak performance.
Air Conditioning Repair in Deerfield, IL
If your AC isn’t cooling effectively, is leaking, or making unusual noises, we provide fast and reliable AC repairs. Our team services all AC makes and models, ensuring a quick resolution to any cooling issues.
Air Conditioning Installation & Replacement
Upgrading to a modern AC system improves comfort and efficiency. We install modern air conditioning units designed to handle Deerfield’s summer heat while optimizing energy savings.
If your AC unit is over 10 years old and struggling to keep up with demand, it may be time for AC replacement. We install energy-efficient air conditioning systems that enhance comfort and lower energy bills.
AC Maintenance
Regular maintenance is essential for extending the lifespan of your air conditioner. Our comprehensive AC tune-ups improve efficiency, reduce energy costs, and help prevent unexpected breakdowns.
Deerfield Plumbing Services
Deljo Heating and Cooling is more than just an HVAC provider. We also offer plumbing services in Deerfield. Our licensed plumbers are equipped to handle everything from minor repairs to major plumbing emergencies.
Emergency Plumbing Repairs
Our 24/7 emergency plumbing services help Deerfield homeowners address leaks, burst pipes, and other urgent plumbing issues.
Drain Cleaning & Clog Removal
Blocked drains can lead to serious plumbing problems. Our team provides professional drain cleaning services to keep your pipes flowing smoothly.
Pipe Repair & Frozen Pipe Solutions
Cold winters can cause pipes to freeze and burst. We offer pipe repair services to prevent costly water damage.
Sump Pump Services
Protect your home from water damage with a properly maintained sump pump. We offer installation and routine maintenance to ensure optimal performance year-round.
Water Heater Services in Deerfield, IL
Hot water is essential for daily life. Deljo Heating and Cooling offers complete water heater services in Deerfield, IL. This includes installation, repair, and maintenance for traditional and tankless water heaters.
Water Heater Installation & Replacement
If your water heater is outdated or failing, we install units that provide reliable hot water while reducing energy costs.
Water Heater Repair
Is your water heater not producing hot water? We diagnose and repair common water heater issues, from faulty thermostats to sediment buildup.
Water Heater Maintenance
Regular maintenance extends the life of your water heater and prevents unexpected breakdowns. Our tune-ups include flushing the system, checking the anode rod, and ensuring optimal performance.
Indoor Air Quality Solutions in Deerfield
The air quality in your home plays a crucial role in your family’s health and comfort. We offer whole-home air purification, humidifiers, dehumidifiers, and air filters to reduce allergens, pollutants, and airborne contaminants. Our solutions help maintain a cleaner, healthier indoor environment year-round.
Understanding HVAC & Plumbing Costs
Pricing for HVAC and plumbing services can vary based on several factors, including:
- System Size & Complexity: Larger homes or more complex systems may require additional work and materials.
- Repair Severity: A minor issue, such as a clogged filter, costs less than replacing a furnace motor or repairing refrigerant leaks.
- Equipment Efficiency: High-efficiency units may have a higher upfront cost but offer long-term energy savings.
- Emergency vs. Standard Service: Emergency repairs often come at a premium due to after-hours service needs.
- Installation Requirements: Replacing ductwork or upgrading electrical components may impact overall costs.
We provide upfront, transparent pricing for all services and offer financing options to make repairs and upgrades more affordable.
Contact Us for Plumbing and HVAC in Deerfield
Whether you need HVAC or plumbing services in Deerfield, Deljo Heating and Cooling is here to help. Call us at (773) 888-4229 or schedule service online today!
Recent Jobs and Reviews in Deerfield, IL
Job Locations and Reviews
Performed comprehensive air conditioning maintenance and system diagnostics. Conducted electrical measurements at the outdoor condenser unit using a True RMS digital multimeter to verify proper voltage and amperage levels. Inspected condenser coil fins for debris accumulation and airflow restrictions, noting some discoloration between coil slats. Measured indoor air handler temperature readings, recording 50.3°F at the evaporator coil to confirm proper refrigerant charge and system performance. Documented all findings with photographic evidence for maintenance records.
Responded to service call for non-functioning thermostat with blank display screen. Upon arrival, confirmed Côr brand thermostat had no power to display unit. Performed diagnostic testing using multimeter to verify 24VAC power supply from HVAC system to thermostat terminals. Testing indicated proper voltage present at equipment, confirming issue isolated to thermostat wiring or internal component failure. Completed troubleshooting and restored thermostat functionality to resume normal HVAC system operation.
Replaced failed copper drain piping with PVC drainage system in basement utility area. Installation included proper fitting connections, secure mounting to concrete block wall, and integration with existing plumbing infrastructure. Work completed in compliance with applicable plumbing codes.
Completed inspection of waste copper piping in basement utility area. Identified active leak in horizontal copper waste line requiring replacement. Documented existing plumbing infrastructure including exposed copper piping, PVC drainage system, and water heater installation for service records.
Performed New Gas Service clean and check on two air conditioning systems and diagnosed furnace heating issue. Inspected thermostat operation showing 72°F current temperature with system maintaining programmed setpoint of 73°F until 1:00pm. Examined air distribution components including curved vent registers which displayed dust accumulation on louvers and slats. Completed routine maintenance procedures on both AC units and investigated reported inadequate heating performance from furnace system.
Completed semi-annual maintenance on two Carrier condensing units located on exterior concrete pads. Performed comprehensive inspection of both systems including condenser coil cleaning, refrigerant line examination, and electrical connection verification. Media filter replacement not included per service agreement specifications.
Completed full air conditioning system replacement including outdoor condenser unit and indoor evaporator coil. Installed new Bryant equipment, connected refrigerant lines, verified proper electrical connections, and tested system operation to ensure optimal cooling performance. All components are functioning within manufacturer specifications.
Conducted comprehensive inspection of existing ductwork system in attic and basement areas to assess condition and identify repair requirements. Documented deteriorated structural supports, compromised insulation with visible water damage and staining, and aging galvanized metal ductwork showing signs of wear. Performed detailed measurements of affected duct sections and provided photographic documentation of all areas requiring remediation, including sagging insulation, structural beam deterioration, and exposed framing components.
Completed routine HVAC maintenance agreement service on residential outdoor condensing unit. Performed standard system inspection, connected manifold gauges to verify refrigerant pressures and system performance, and documented equipment condition with photos. System operating within normal parameters; customer requested equipment information be updated in service tracking system.
Completed HVAC system replacement for a 19-year-old outdoor condenser unit experiencing active refrigerant leak and failing electrical components. The existing unit, located in an easily accessible side yard area with adequate clearance, was removed and replaced with a new system. All ductwork connections in the attic space were inspected and verified to be compatible with the new equipment installation.
Completed preventive maintenance inspection on Payne condensing unit as part of agreement service. Documented extensive mold and mildew growth in air handler interior corner indicating moisture infiltration and condensation issues requiring attention. Verified condenser operation and captured equipment condition photos for service records.
Performed routine HVAC maintenance agreement service, including inspection of blower wheel assembly and replacement of 24x24x1 air filter. Removed dirty filter showing significant dust accumulation and installed new HDX replacement filter to restore proper airflow and system efficiency.
Performed maintenance agreement inspection on multi-zone system including two condensers, two dehumidifiers, one media filter, and one electronic air cleaner. Addressed cooling deficiency complaint on unit #501 by inspecting condenser components, including capacitor, contactor, and electrical connections; found debris accumulation in outdoor unit and removed insulation material that had become dislodged from system. Cleaned compartment, verified proper electrical connections, and restored unit to operational status.
