Are you looking for reliable HVAC and plumbing services in Northfield? If so, look no further than Deljo Heating and Cooling. We’ve provided Chicagoland residents with reliable HVAC services for over 100 years. Recently, we expanded our service offerings to include plumbing as well.
We believe our longevity can be attributed to two things. First and foremost, our top-quality heating, cooling, and plumbing services. Secondly, our commitment to treating our customers like family.
No matter what your HVAC or plumbing needs are, we are here to help. If you are experiencing an emergency, call us for emergency HVAC services or emergency plumbing services.
Northfield Heating Services
Northfield winters can be unforgiving. In this community, a reliable heating system is an absolute necessity. At Deljo Heating and Cooling, our heating experts are trained to keep your system operating efficiently, safely, and affordably throughout the coldest months.
We offer a full range of heating solutions to meet your needs, including:
- Furnace repair: If you need furnace repair in Northfield, our fast and professional technicians will get it back up and running.
- Furnace installation: Ready to upgrade or replace your old system? Ask us about options tailored to your home.
- Furnace maintenance: Prevent breakdowns before they start with our preventive maintenance services.
For boilers, we offer expert boiler repair, boiler maintenance, and new boiler installation. If you’re interested in a high-efficiency furnace alternative, consider installing a heat pump for year-round energy savings.
No matter what type of system you have, Deljo can help you stay warm with customized solutions that meet your budget and comfort goals. Our technicians take the time to do the job right and ensure lasting performance. 24/7 emergency availability ensures you’re never left in the cold.
Northfield Air Conditioning Services
When summer temperatures climb, a working air conditioner is more than a luxury. It’s necessary for your well-being. Deljo Heating and Cooling provides fast, effective air conditioning services for Northfield homeowners looking to stay cool and energy-efficient.
Here’s how we can help you beat the heat:
- Air conditioning repair: We will quickly and affordably restore your cool air.
- Air conditioning installation: Install an energy-efficient air conditioner to improve comfort and lower utility bills.
- Air conditioning maintenance: Routine maintenance will help you avoid midsummer breakdowns and extend your system’s life.
- Ductless mini split air conditioning: Ductless air conditioning offers zoned temperature control and is easy to install.
We work with all makes and models and will help you choose the best solution for your home’s layout and cooling needs. We offer 24/7 emergency AC repairs so you’re never left sweating it out.
Northfield Plumbing Services
Plumbing issues can make your life difficult and cause severe property damage. Fortunately, our licensed plumbers can handle any challenge with precision and care. We provide a range of plumbing services to keep your home running smoothly, and an emergency plumber in Northfield is always available to help you.
Drain & Pipe
Clogged or damaged pipes can slow your household down to a crawl. Our team will clear the problem quickly and prevent it from coming back. We offer
- Drain cleaning to quickly clear blockages.
- Pipe repairs to fix leaks and restore water flow.
- Frozen pipe repair to thaw your pipes and protect your home.
These services protect your plumbing system and improve water flow and reliability throughout your home.
Water Heaters & Filtration
Your water supply should be steady, reliable, and clean. The following services will provide you with clean hot water on demand:
- Water heater repair and installation to ensure you always have hot water available.
- Water filtration services to improve the water quality throughout your home.
From daily tasks to long showers, we’ll make sure your water system meets your needs. We install and service both traditional tank water heaters and tankless water heaters.
Flood Prevention Solutions
Water damage can be devastating, especially in flood-prone areas. Deljo offers proactive solutions to keep your property protected, including:
- Sump pump services to pump water away from your home’s foundation.
- Flood control solutions to protect your basement from water damage.
We’ll help you take preventive action before the next big storm hits.
Fixture Installation & Repairs
From faucets to toilets, our team installs and repairs plumbing fixtures with precision and care. Whether you’re remodeling or just making a small update, we provide the reliable plumbing support you need.
Why Northfield Homeowners Choose Deljo
We’ve spent over a century earning our reputation for dependable service and exceptional customer care. Our licensed professionals go above and beyond to deliver solutions that last.
Here’s what sets us apart:
- Licensed, certified, and highly trained technicians
- 100+ years of combined HVAC and plumbing experience
- 24/7 emergency service availability
- Transparent pricing and financing options
- Trusted throughout Chicagoland for honest, reliable service
With Deljo, you’re not just a customer—you’re family.
Request Your HVAC or Plumbing Service Today
Deljo Heating & Cooling is here to meet the HVAC and plumbing needs of Northfield residents. Call us today at (773) 829-4295 for a free quote or to schedule service. Our technicians have the right training and equipment to complete most tasks on the day you contact us.
Recent Jobs and Reviews in Northfield, IL
Northfield, IL at a glance
Deljo Heating, Cooling & Plumbing has completed 19 jobs in Northfield, IL between February 2026 and September 2026.
The most recent job was on September 8, 2026.
Job Locations and Reviews
Completed comprehensive HVAC maintenance agreement service including air conditioning system inspection and diagnostics. Performed electrical testing of control panel components with multimeter, recording 79 amp reading, and inspected all wiring connections, circuit boards, and mechanical components. Replaced 16x25x1 air filter and documented system condition with photos of control panel, ductwork, PVC condensate drain line, and refrigerant line installation.
Completed routine HVAC maintenance agreement service on air conditioning system. Inspection revealed heavily soiled evaporator coil with significant dirt and debris accumulation affecting heat transfer efficiency. Supply air temperature measured at 48.3°F at register, confirming system cooling operation. Customer advised that 20x25x4 filter is not included in maintenance agreement coverage.
Responded to service call for toilet not flushing properly and producing unusual sounds. Upon inspection, identified issues with the flush mechanism and internal components. Performed necessary repairs to restore proper flushing function and eliminate operational noise, ensuring unit returned to normal working condition.
Completed comprehensive HVAC maintenance agreement service on residential forced-air heating system with integrated Aprilaire humidifier unit. Performed standard maintenance inspection of furnace/air handler, verified proper operation of humidity control system, checked condensate drainage piping and PVC connections, and conducted electrical testing of system components using diagnostic equipment. Installed 20x25x1 filter and inspected galvanized ductwork, gas line connections, and all mechanical components to ensure system operating within manufacturer specifications.
Completed full air conditioning system installation including replacement of outdoor condensing unit, indoor evaporator coil, and thermostat. All components were properly staged, installed per manufacturer specifications, and tested for optimal performance. System refrigerant lines were connected with proper insulation, condensate drainage was verified, and electrical connections were secured to ensure safe and efficient operation.
Evaluated 29-year-old R22 air conditioning system serving home addition and found multiple failed components beyond economical repair. System utilizes phased-out R22 refrigerant, making future service increasingly difficult and costly. Documented existing indoor humidifier installation integrated with ductwork in mechanical room and outdoor condensing unit positioned alongside building foundation. Provided comprehensive replacement recommendations for complete system upgrade to modern, efficient equipment compatible with current refrigerant standards.
# HVAC Service Call - No Cooling Issue Responded to service call for dual air conditioning system with one unit failing to produce adequate cooling. Customer reported unit only delivering cool air rather than cold air. Both systems are 15-20 years old. ## Diagnostic Findings Performed comprehensive system evaluation on the affected unit. Utilized digital temperature measurement equipment to assess air temperature differential across the evaporator coil, recording supply air temperature of 54.8°F. Inspected indoor air handler and plenum assembly for proper airflow and component operation. Conducted visual inspection of air filtration system, noting moderate dust accumulation on pleated filter media. Filter appeared to be restricting airflow, which can reduce system efficiency and cooling capacity. Examined metal ductwork and housing components, observing significant aging with dust and grime buildup throughout the system. Assessed furnace/air handler unit configuration, including P
Responded to no cooling call and found PVC condensate drain line leaking, which had activated the safety float switch and shut down the system. Repaired the leaking PVC connection, verified proper drainage, reset the safety switch, and confirmed system operation restored with normal cooling function.
Completed comprehensive maintenance on residential air conditioning system under agreement terms. Performed detailed inspection of condenser unit electrical components including capacitor and contactor, verified all wire connections secure and properly terminated. Changed 16x25x1 filter, cleaned condenser coils, and documented equipment condition with photos showing all major components functioning within normal parameters.
Returned to site with diagnostic equipment to further troubleshoot system malfunction. Upon inspection, discovered severely deteriorated electrical junction box and motor connections with extensive debris accumulation, moisture damage, and corroded components. Documented conditions with photographs showing compromised wiring, damaged insulation materials, and degraded terminal connections requiring immediate attention. Additional diagnostic testing with smart tools will be necessary to determine full extent of electrical system damage and develop comprehensive repair plan.
Responded to no cooling complaint on 1-year-old ductless mini-split system. Upon arrival, found wall-mounted indoor unit displaying temperature but not operating. Performed diagnostic testing and discovered system had tripped breaker due to electrical fault. Reset breaker, tested unit operation, confirmed proper cooling function restored, and verified all system parameters within normal operating range.
Completed comprehensive maintenance agreement inspection on two air conditioning systems. Performed full system evaluation including condenser coil inspection for cleanliness and leaks, blower motor and wheel debris check, indoor relative humidity testing, and refrigerant level measurement using manifold gauges. Cycled and visually inspected all operating controls, line voltage switches, and wiring for proper operation and safety compliance. Examined electrical connections for tightness and deterioration, inspected condensate drainage system for proper function, and checked refrigerant lines for visible leaks and insulation condition. Noted significant dust and debris accumulation on return air grille fins requiring attention. All safety and performance parameters evaluated per maintenance agreement protocol.
Completed courtesy check on two air conditioning systems using 20x25x1 filters. Inspected electrical components and refrigerant lines on both units. Found capacitor showing signs of corrosion and oxidation on terminal connections, requiring monitoring for future replacement. Copper refrigerant lines displayed significant corrosion and surface deterioration, though system remained operational. Documented equipment condition with photos for maintenance records.
Successfully replaced hot/cold cartridge for bathtub valve and installed new handles, restoring proper temperature control functionality. Performed drain rodding service to clear blockage in tub drain, ensuring proper water drainage and preventing future backups.
Conducted plumbing estimate for bathroom fixtures showing significant wear. Assessed wall-mounted hot and cold faucet handles in both bathtub/shower and sink areas that were loose and require replacement. Documented water staining on surrounding surfaces and mineral deposits around drain areas, indicating ongoing issues with the current fixtures.
Performed comprehensive evaluation of 2012 furnace exhibiting inducer motor failure. Inspected ductwork connections and measured clearances, noting significant metal deterioration and possible corrosion at junction points. Recommended full system replacement due to age of existing equipment (2001 AC unit) and safety concerns with current installation.
Responded to emergency no-heat call for 10+ year old system with recurring failure issue. Diagnosed faulty limit switch on aging furnace causing system shutdown; replaced switch and verified proper operation. Completed visual inspection of connected Aprilaire humidifier and ductwork, noting system is approaching end of useful life with recommendation for replacement to prevent future failures.
Responded to no heat call for 10+ year old Comfortmaker furnace. Diagnostic found system with blower operating but no heat production and thermostat displaying alert. Determined cause was failed flame sensor, cleaned and reinstalled component which restored proper ignition sequence and heating function.
Successfully replaced two furnaces and installed a new humidistat. Conducted comprehensive testing of the new systems, including temperature readings (346°) with Klein Tools ET100 thermometer and pressure measurements (145) using Klein Tools ET180 Differential Manometer to verify proper operation and airflow.
