Chicago's Authorized Lennox dealer Since 2010 | D's Air & Heating
D's Air & Heating is an Authorized Lennox dealer serving Chicago since 2010, providing expert Lennox installation, repair, maintenance, and replacement services throughout Chicago and the surrounding communities.
Lennox Boilers for Reliable,
Even Heating in Northern Homes
High-efficiency gas boilers for homes with radiators, baseboard heat, or radiant floors. Quiet, even warmth — no drafts, no noise.
Lennox Premier dealer · IL License #2183457 · Serving Chicago Since 2009
Hydronic Heating Specialists
Why Lennox Boilers Are Ideal for Cold Climates
Why Lennox Boilers Are Ideal for Cold Climates
Hydronic heating distributes warmth through radiators, baseboards, or in‑floor piping, creating smooth, even comfort. Lennox boilers maintain stable temperatures, reduce energy waste, and operate quietly — perfect for older homes, multi‑unit buildings, and properties with existing radiator systems.
Hydronic Heating: Quiet, Even, Consistent Comfort
Lennox boilers deliver heat through water rather than air. Hot water circulates through radiators, baseboard convectors, or in‑floor tubing, radiating warmth evenly from every surface. The result is a room that feels uniformly comfortable — no cold spots near windows, no hot blasts from registers, and no noise from a blower motor cycling on and off. Hydronic heat is widely considered the most comfortable form of residential heating, and Lennox boilers are engineered to deliver it reliably year after year.
High‑Efficiency Boiler Options for Lower Energy Bills
Lennox offers standard‑efficiency and high‑efficiency condensing boilers designed to lower fuel usage and reduce monthly heating costs. The GCWB95 condensing boiler reaches 95% AFUE — meaning 95 cents of every dollar spent on gas goes directly into heating your home. Many Lennox boilers also integrate easily with smart thermostats and zoning controls, giving homeowners more precise comfort and better control over energy use.
Perfect for Radiators, Baseboards, and Older Homes
Chicago's classic homes often rely on radiator or baseboard heating. Lennox boilers integrate seamlessly with these systems, providing reliable warmth and long‑term performance. Hydronic heat is ideal for homes with older ductwork, boiler‑based heating, or rooms that struggle to stay warm. Whether your home has cast iron radiators, fin‑tube baseboard convectors, or radiant floor tubing, there's a Lennox boiler sized and configured for your setup.
Condensing vs. Standard Boilers: What's Best for You?
Standard boilers like the GWB84-E and GWB84-IE operate at 84% AFUE — reliable, proven, and cost-effective to install. Condensing boilers like the GCWB95 extract additional heat from exhaust gases, reaching 95% AFUE and delivering meaningful long‑term energy savings. The right choice depends on your existing venting, budget, and how long you plan to stay in the home. D's Air will walk you through both options and help you make the decision that makes the most sense for your situation.
Compare Lennox Boilers
| Model | Type | AFUE | Best For | Notes |
|---|---|---|---|---|
| GWB84 | Standard | 84% | Older homes, basic hydronic systems | Reliable, budget‑friendly |
| GWB95 | High‑Efficiency | 95% | Energy‑conscious homeowners | Lower fuel usage |
| GWB96 | High‑Efficiency | 96% | Radiators & baseboards | Quiet operation |
| GWB98Top Pick | Condensing | 98% | Maximum efficiency | Best for new installs or upgrades |
How Hydronic Heating Works
Hydronic heating uses heated water instead of forced air to warm your home. A boiler heats water and circulates it through radiators, baseboards, or in‑floor piping. As the water moves through the system, it releases gentle, even heat throughout every room.
Benefits of Hydronic Heating
- Even comfort — no blasts of hot air
- Quiet operation — no fans or blowers
- Cleaner air — fewer airborne particles
- Energy efficient — stable temperatures reduce waste
- Perfect for older homes with radiator systems
Hydronic heating is one of the most comfortable and efficient ways to heat a home, especially in northern climates like Chicago.
Professional Lennox Boiler Installation in Chicago
DsAir provides expert boiler installation, replacement, and service throughout Chicago. We size your boiler correctly, ensure proper venting, and deliver long‑term reliability backed by Lennox engineering. Whether you're replacing an aging system, upgrading to a more efficient model, or adding hydronic heat to a renovation, we can help you choose the right boiler for your home.
Lennox boilers deliver dependable, even heat for Chicago homes that rely on hydronic heating systems. At D's Air & Heating, we install, repair, and maintain the full Lennox boiler lineup, including standard-efficiency and high-efficiency models designed for long-lasting performance. Chicago winters demand a heating system capable of producing steady warmth without drafts, and Lennox boilers excel with durable heat exchangers, quiet operation, and advanced hydronic technology that circulates warm water through radiators, baseboards, or in-floor heating.
Our technicians provide manufacturer-approved installations, precision piping, and full system diagnostics to ensure your Lennox boiler operates at peak efficiency. Whether you're replacing an aging boiler or upgrading to a high-efficiency model, we offer clear pricing, fast service, and professional workmanship — all with no contracts required. Lennox boilers help reduce energy costs with improved AFUE ratings, sealed-combustion designs, and compatibility with smart thermostats. Browse the full Lennox Systems Overview to compare models across the entire lineup.
We also specialize in Lennox hydronic system upgrades, including zoning, pump replacements, radiator and hydronic services, and boiler-to-boiler changeouts. Proper hydronic design ensures balanced heat, quieter operation, and long-term reliability — critical for older Chicago homes and multi-unit buildings. With proper installation and routine maintenance from D's Air & Heating, your Lennox boiler will deliver reliable comfort throughout Chicago's coldest months. Contact us for a free estimate today.
Lennox Boiler Lineup
GCWB95 · GWB84-IE · GWB84-E · GSB8-E · OWB86
26 individual models — condensing combi, induced-draft hot water, cast iron hot water, steam, and oil-fired. Every model shows exact BTU, AFUE, sale price, and installed price.
Lennox Boiler Series — Select a Category
Condensing Combi Boilers
Lowest-Tier Model: GCWB95W-150
153,000 BTU DHW / 125,000 BTU Space Heating
95% AFUE
*Local taxes may apply. Financing available.
Induced Draft Water Boilers
Lowest-Tier Model: GWB84-042IE
42,500 BTU
84.4% AFUE
*Local taxes may apply. Financing available.
Cast Iron Water Boilers
Lowest-Tier Model: GWB84-060E
59,000 BTU
84% AFUE
*Local taxes may apply. Financing available.
Cast Iron Steam Boilers
Lowest-Tier Model: GSB8-075E
75,000 BTU
82.7% AFUE
*Local taxes may apply. Financing available.
Oil-Fired Water Boilers
Lowest-Tier Model: OWB86-3
112,000 BTU
86% AFUE
*Local taxes may apply. Financing available.
LX-BOIL-GCWB95W-150-INST
Lennox GCWB95W-150
Wall-hung condensing combination boiler. 95% AFUE. Provides both space heating and domestic hot water from a single unit.
- 95% AFUE condensing efficiency
- Wall-hung installation
- Combination space heat + hot water
- Gas or LP compatible
- Lennox manufacturer warranty
Sale Price
$6,765
Installed Price
$14,995
Financing Available · *Local taxes may apply
LX-BOIL-GCWB95F-150-INST
Lennox GCWB95F-150
Floor-mount condensing combination boiler. 95% AFUE. Same output as the wall-hung model at a lower installed cost.
- 95% AFUE condensing efficiency
- Floor-mount installation
- Combination space heat + hot water
- Gas or LP compatible
- Lennox manufacturer warranty
Sale Price
$6,071
Installed Price
$14,495
Financing Available · *Local taxes may apply
LX-BOIL-GCWB95W-205-INST
Lennox GCWB95W-205
High-output wall-hung condensing combination boiler. 95% AFUE. Ideal for larger homes needing both space heating and domestic hot water.
- 95% AFUE condensing efficiency
- High-output 205,000 BTU
- Wall-hung installation
- Gas or LP compatible
- Lennox manufacturer warranty
Sale Price
$7,664
Installed Price
$15,995
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-042IE-INST
Lennox GWB84-042IE
Compact induced-draft hot water boiler for smaller homes. 84.4% AFUE with positive venting for flexible installation.
- 84.4% AFUE efficiency
- Induced-draft blower
- Compact 42,500 BTU output
- Cast iron heat exchanger
- Lennox manufacturer warranty
Sale Price
$5,667
Installed Price
$12,995
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-075IE-INST
Lennox GWB84-075IE
Mid-range induced-draft hot water boiler. 84% AFUE with positive venting for homes where natural-draft isn't practical.
- 84% AFUE efficiency
- Induced-draft blower
- 75,000 BTU output
- Cast iron heat exchanger
- Lennox manufacturer warranty
Sale Price
$6,272
Installed Price
$13,495
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-112IE-INST
Lennox GWB84-112IE
Larger induced-draft hot water boiler for medium to large homes. 84% AFUE with cast iron durability.
- 84% AFUE efficiency
- Induced-draft blower
- 112,500 BTU output
- Cast iron heat exchanger
- Lennox manufacturer warranty
Sale Price
$7,361
Installed Price
$14,495
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-150IE-INST
Lennox GWB84-150IE
High-output induced-draft hot water boiler for larger homes. 84% AFUE with positive venting.
- 84% AFUE efficiency
- Induced-draft blower
- 150,000 BTU output
- Cast iron heat exchanger
- Lennox manufacturer warranty
Sale Price
$7,700
Installed Price
$15,495
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-187IE-INST
Lennox GWB84-187IE
Top-output induced-draft hot water boiler for large homes and multi-unit buildings. 84% AFUE.
- 84% AFUE efficiency
- Induced-draft blower
- 187,500 BTU output
- Cast iron heat exchanger
- Lennox manufacturer warranty
Sale Price
$8,676
Installed Price
$16,995
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-060E-INST
Lennox GWB84-060E
Entry-level cast iron hot water boiler for smaller Chicago homes. 84% AFUE with natural-draft venting.
- 84% AFUE efficiency
- Cast iron heat exchanger
- Natural-draft venting
- Compatible with radiators & baseboard
- Lennox manufacturer warranty
Sale Price
$5,987
Installed Price
$12,995
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-095E-INST
Lennox GWB84-095E
Mid-range cast iron hot water boiler. 84% AFUE. Ideal for average-sized Chicago homes with radiators or baseboard heat.
- 84% AFUE efficiency
- Cast iron heat exchanger
- Natural-draft venting
- Compatible with radiators & baseboard
- Lennox manufacturer warranty
Sale Price
$6,477
Installed Price
$13,995
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-120E-INST
Lennox GWB84-120E
Larger cast iron hot water boiler for medium to large homes. 84% AFUE with proven cast iron reliability.
- 84% AFUE efficiency
- Cast iron heat exchanger
- Natural-draft venting
- Compatible with radiators & baseboard
- Lennox manufacturer warranty
Sale Price
$6,858
Installed Price
$14,495
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-150E-INST
Lennox GWB84-150E
High-output cast iron hot water boiler. 84% AFUE. Handles larger homes and multi-zone hydronic systems.
- 84% AFUE efficiency
- Cast iron heat exchanger
- Natural-draft venting
- Multi-zone compatible
- Lennox manufacturer warranty
Sale Price
$7,194
Installed Price
$15,495
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-175E-INST
Lennox GWB84-175E
Large-capacity cast iron hot water boiler for bigger homes. 84% AFUE with long-lasting cast iron construction.
- 84% AFUE efficiency
- Cast iron heat exchanger
- 175,000 BTU output
- Multi-zone compatible
- Lennox manufacturer warranty
Sale Price
$8,103
Installed Price
$16,495
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-205E-INST
Lennox GWB84-205E
Extra-large cast iron hot water boiler for large homes and multi-unit buildings. 84% AFUE.
- 84% AFUE efficiency
- Cast iron heat exchanger
- 205,000 BTU output
- Multi-zone compatible
- Lennox manufacturer warranty
Sale Price
$8,759
Installed Price
$17,495
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-235E-INST
Lennox GWB84-235E
High-capacity cast iron hot water boiler. 84% AFUE. Built for large Chicago homes and two-flats.
- 84% AFUE efficiency
- Cast iron heat exchanger
- 235,000 BTU output
- Multi-zone compatible
- Lennox manufacturer warranty
Sale Price
$8,933
Installed Price
$17,995
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-262E-INST
Lennox GWB84-262E
Commercial-grade cast iron hot water boiler for large multi-unit buildings. 84% AFUE.
- 84% AFUE efficiency
- Cast iron heat exchanger
- 262,000 BTU output
- Multi-zone compatible
- Lennox manufacturer warranty
Sale Price
$10,002
Installed Price
$18,995
Financing Available · *Local taxes may apply
LX-BOIL-GWB84-299E-INST
Lennox GWB84-299E
Top-of-range cast iron hot water boiler. 84% AFUE. Maximum output for large buildings and commercial applications.
- 84% AFUE efficiency
- Cast iron heat exchanger
- 299,000 BTU output
- Multi-zone compatible
- Lennox manufacturer warranty
Sale Price
$10,595
Installed Price
$19,995
Financing Available · *Local taxes may apply
LX-BOIL-GSB8-075E-INST
Lennox GSB8-075E
Entry-level gas steam boiler for Chicago homes with existing steam radiators. 82.7% AFUE.
- 82.7% AFUE efficiency
- Gas steam boiler
- Ideal for steam radiator systems
- Cast iron sections
- Low-water cutoff included
- Lennox manufacturer warranty
Sale Price
$6,039
Installed Price
$13,995
Financing Available · *Local taxes may apply
LX-BOIL-GSB8-112E-INST
Lennox GSB8-112E
Mid-range gas steam boiler for average-sized homes with steam radiators. 82% AFUE.
- 82% AFUE efficiency
- Gas steam boiler
- 112,000 BTU output
- Cast iron sections
- Low-water cutoff included
- Lennox manufacturer warranty
Sale Price
$6,227
Installed Price
$14,495
Financing Available · *Local taxes may apply
LX-BOIL-GSB8-150E-INST
Lennox GSB8-150E
Larger gas steam boiler for medium to large homes with steam radiator systems. 82% AFUE.
- 82% AFUE efficiency
- Gas steam boiler
- 150,000 BTU output
- Cast iron sections
- Low-water cutoff included
- Lennox manufacturer warranty
Sale Price
$6,881
Installed Price
$15,495
Financing Available · *Local taxes may apply
LX-BOIL-GSB8-187E-INST
Lennox GSB8-187E
High-output gas steam boiler for larger Chicago homes and two-flats. 82% AFUE.
- 82% AFUE efficiency
- Gas steam boiler
- 187,000 BTU output
- Cast iron sections
- Low-water cutoff included
- Lennox manufacturer warranty
Sale Price
$7,430
Installed Price
$16,495
Financing Available · *Local taxes may apply
LX-BOIL-GSB8-225E-INST
Lennox GSB8-225E
Extra-large gas steam boiler for large homes and multi-unit buildings. 82% AFUE.
- 82% AFUE efficiency
- Gas steam boiler
- 225,000 BTU output
- Cast iron sections
- Low-water cutoff included
- Lennox manufacturer warranty
Sale Price
$8,201
Installed Price
$17,495
Financing Available · *Local taxes may apply
LX-BOIL-GSB8-262E-INST
Lennox GSB8-262E
Commercial-grade gas steam boiler for large multi-unit buildings. 82% AFUE.
- 82% AFUE efficiency
- Gas steam boiler
- 262,000 BTU output
- Cast iron sections
- Low-water cutoff included
- Lennox manufacturer warranty
Sale Price
$9,072
Installed Price
$18,495
Financing Available · *Local taxes may apply
LX-BOIL-GSB8-299E-INST
Lennox GSB8-299E
Top-output gas steam boiler for large buildings and commercial steam systems. 82% AFUE.
- 82% AFUE efficiency
- Gas steam boiler
- 299,000 BTU output
- Cast iron sections
- Low-water cutoff included
- Lennox manufacturer warranty
Sale Price
$9,614
Installed Price
$19,495
Financing Available · *Local taxes may apply
LX-BOIL-OWB86-3-INST
Lennox OWB86-3
Entry-level oil-fired hot water boiler for homes without gas service. 86% AFUE with cast iron durability.
- 86% AFUE efficiency
- Oil-fired operation
- 112,000 BTU output
- Cast iron heat exchanger
- Compatible with radiators & baseboard
- Lennox manufacturer warranty
Sale Price
$6,227
Installed Price
$14,495
Financing Available · *Local taxes may apply
LX-BOIL-OWB86-4-INST
Lennox OWB86-4
Mid-range oil-fired hot water boiler for larger homes without gas service. 86% AFUE.
- 86% AFUE efficiency
- Oil-fired operation
- 175,000 BTU output
- Cast iron heat exchanger
- Compatible with radiators & baseboard
- Lennox manufacturer warranty
Sale Price
$7,319
Installed Price
$15,995
Financing Available · *Local taxes may apply
LX-BOIL-OWB86-5-INST
Lennox OWB86-5
High-output oil-fired hot water boiler for large homes and multi-unit buildings without gas service. 86% AFUE.
- 86% AFUE efficiency
- Oil-fired operation
- 217,000 BTU output
- Cast iron heat exchanger
- Multi-zone compatible
- Lennox manufacturer warranty
Sale Price
$8,528
Installed Price
$17,495
Financing Available · *Local taxes may apply
Lennox Premier dealer
Proper sizing. Professional installation. Long-term reliability.
Why Hydronic Heat?
The Benefits of Boiler Heating
Even, Draft-Free Warmth
Hydronic heat radiates from surfaces rather than blowing air, eliminating cold spots and drafts.
Whisper-Quiet Operation
No blower motor means no noise — just silent, consistent heat throughout your home.
Better Indoor Air Quality
No ductwork means no dust, allergens, or debris circulating through your living spaces.
Easy Zoning
Hydronic systems support multiple zones with individual thermostats for room-by-room control.
Long Equipment Life
Cast iron boilers routinely last 25–30 years with proper maintenance — far longer than forced-air systems.
Works With Existing Systems
Lennox boilers integrate with your existing radiators, baseboard convectors, or radiant floor piping.
High-Efficiency Heating
Condensing Boilers:
Up to 95% AFUE Efficiency
Condensing boilers extract heat from exhaust gases that standard boilers vent away — capturing that extra energy and putting it back into your home. The result is significantly lower fuel consumption and reduced monthly heating costs, especially in Chicago's long winters.
- 95¢ of every $1 in gas goes directly into heating your home
- Sealed combustion — safer operation, better indoor air quality
- Modulating heat output matches demand — no wasted energy
- Compatible with smart thermostats and zoning systems
Have Questions?
Frequently Asked Questions About Lennox Boilers
How long does a Lennox boiler last?
What's the difference between standard and high‑efficiency boilers?
Can a Lennox boiler heat my entire home?
Do boilers work with smart thermostats?
How often should a boiler be serviced?
What are signs my boiler needs repair?
DIY First Steps
Common Boiler Problems & How to Check Them
Try these checks before calling for service. If the problem persists, schedule a boiler repair.
Boiler Not Heating
- Check thermostat settings
- Verify system pressure (12–20 PSI normal)
- Ensure the boiler switch is ON
- Bleed radiators if cold at the top
Boiler Making Noise
- Banging = air in system
- Whistling = scale buildup
- Rumbling = sediment in boiler
- System likely needs flushing or bleeding
Radiators Not Heating Evenly
- Bleed air from radiators
- Check zone valves
- Verify circulator pump operation
- Cold zone may have a stuck zone valve
Boiler Pressure Too Low
- Add water using the fill valve
- Check for leaks at fittings
- Inspect expansion tank
- Low pressure can shut the boiler down
Boiler Keeps Shutting Off
- Faulty flame sensor
- Ignitor failure
- Pressure switch issues
- Venting blockage
Stay Ahead of Breakdowns
Annual Lennox Boiler Maintenance Checklist
DsAir covers every item on this list during a professional boiler tune-up. Schedule Lennox boiler maintenance to keep your system running safely all winter.
System Inspection
- Inspect boiler exterior
- Check for leaks
- Verify venting and combustion air
- Inspect heat exchanger
Safety & Controls
- Test flame sensor
- Test ignitor
- Test gas valve operation
- Verify pressure relief valve
- Check thermostat communication
Hydronic System
- Check system pressure (12–20 PSI)
- Inspect expansion tank
- Test circulator pump
- Test zone valves
- Bleed radiators if needed
Cleaning & Efficiency
- Clean burners
- Clean flame sensor
- Flush system if sediment present
- Check combustion efficiency
- Document readings & recommendations
Verified Homeowners
Real Customer Reviews
See what verified homeowners across Chicago are saying about their heating and cooling upgrades.
"DsAir replaced our old boiler with a Lennox high‑efficiency model. The heat is even throughout the house and our gas bill dropped noticeably."
"Our 1920s home finally heats evenly. The new Lennox boiler is quiet and reliable."
"The ceiling cassette mini‑split keeps our attic comfortable year‑round. Professional installation and great results."
"Elite Series Lennox AC installed by DsAir. Fast service, clean work, and excellent cooling."
Shannon Phipps
September 11, 2026
he really does a great job, and not over charging for his services
joyce thompson
September 9, 2026
I just had Darryl and his son DeMarte at my place to do a furnace clean and check before the cold weather comes along. They did a great job of getting my furnace ready for the winter....they were both personable and you can tell that Darryl is very invested in the work that he does. I would definitely suggest them for your heating needs. And I like their slogan...."Dont Freeze, Call D"s....sort of sums it up right there : ))
Audrey Sekendur
September 5, 2026
Darryl fixed our AC during a heat advisory and he was very professional and friendly. He really helped us out, I would absolutely recommend his company and plan to use D's Heating and Air again in the future.
Afagh Saghafi
August 8, 2026
John Egger
July 28, 2026
Prompt and excellent work and a pleasure to deal with.
Danielle Pappas
July 25, 2026
Darrell Jr and Darrell Sr were prompt, offered great service, and were able to get parts and finish the job same day. Pricing was better than the other estimate I received. I will work with them again!
Phillip B
July 19, 2026
Can't say enough good things about D's Air & Heating. Darryl Q. Joyner Sr. is knowledgeable, professional, and honest — a rare combination in HVAC. He walked me through exactly what was going on with my system, gave me a fair, upfront estimate, and got the work done cleanly and on schedule. No games, no surprise charges.
Kenneth Scott
May 8, 2026
Excellent Service and great customer service
15% Off With Our Maintenance Agreement
Sign up for a D's Air Maintenance Agreement and receive 15% off qualifying repairs and upgrades upon acceptance.
Service call charge is for travel and diagnostics only. It is not deducted from the job total.
Chicago's Boiler Installation Experts
Upgrade to a High‑Efficiency Lennox Boiler Today
Experience reliable, even heat all winter long with a professionally installed Lennox boiler. DsAir provides expert sizing, installation, and service for hydronic heating systems across Chicago.
Don't "FREEZE" — Call D's for fast, reliable boiler installation.
Why Chicago Homeowners Trust D's Air & Heating
Licensed & Insured
IL License #2183457
Serving Chicago
Since 2009
Authorized Dealer
Multiple Brands
No Contracts
Ever — Guaranteed
Permit Pulled
Every Installation
Professional Standards
Code-Compliant Work
EPA Certified
Mainstream Engineering
R-410A Certified
Mainstream Engineering
Why Choose D's Air & Heating, Inc.?
Chicago's trusted HVAC company since 2009 — licensed, insured, and committed to honest workmanship on every job.
Experience Since 2009
D's Air & Heating has served Chicago homeowners and businesses since 2009. Over 15 years of local HVAC experience means we've seen every type of system, every Chicago building configuration, and every challenge the city's climate presents.
Manufacturer-Trained Technicians
Our technicians receive ongoing manufacturer training and certification. We install Lennox, Goodman, Amana, Daikin, Sinclair, Weil-McLain, Peerless, and other leading brands — and we know each system inside and out.
Licensed, Insured & Permitted
D's Air & Heating holds Illinois HVAC License #2183457 and carries full liability insurance. We pull City of Chicago permits on every installation — protecting you legally and ensuring the work meets code.
Honest Recommendations
We tell you what you need — not what generates the highest invoice. If your system can be repaired cost-effectively, we'll say so. If replacement makes more sense, we'll explain exactly why. No pressure, no upselling.
Local Chicago Expertise
We know Chicago's housing stock — two-flats, greystones, bungalows, vintage buildings with steam heat, modern construction with forced air. We size and install equipment for the specific demands of Chicago homes and Chicago winters.
Long-Term Customer Support
Our relationship doesn't end at installation. We register your equipment for warranty, remain available for follow-up questions, and provide ongoing maintenance to keep your system running at peak efficiency for years.
What Chicago Homeowners Should Know About Boiler Installation
How a Hot Water Boiler Works
A hot water (hydronic) boiler heats water and circulates it through pipes to radiators, baseboard convectors, or radiant floor tubing. The water returns to the boiler, is reheated, and recirculates. Modern condensing boilers achieve 90%+ efficiency by recovering heat from exhaust gases that older boilers waste.
Steam vs. Hot Water Boilers
Steam boilers — common in Chicago's older two-flats and greystones — heat water until it becomes steam, which rises naturally through pipes to cast-iron radiators. They require no circulator pump but need precise water level control. Hot water systems are quieter, more efficient, and easier to zone. D's Air installs and services both.
Boiler Sizing and Near-Boiler Piping
Correct boiler sizing requires calculating the heat loss of every room in the building. Oversized boilers short-cycle and cause water hammer in steam systems. Proper near-boiler piping — header design, equalizer pipe, Hartford Loop for steam — is as important as the boiler itself. D's Air follows manufacturer piping diagrams and ASHRAE guidelines on every installation.
Combustion Safety and Venting
Every boiler installation requires proper combustion air supply and flue venting. Inadequate combustion air causes incomplete combustion and carbon monoxide production. Improper venting allows flue gases to back-draft into the living space. D's Air verifies combustion air, draft, and CO levels on every installation.
What to Expect From Your D's Air Boiler Installation
Free Estimate
We inspect your existing system, measure your building, and provide a written quote covering equipment, labor, and permits.
Equipment Selection
We recommend the right boiler type (steam, hot water, condensing, combi) and brand for your building and budget.
Installation Day
Our crew protects your space, removes the old boiler, installs the new system with proper piping, and cleans up completely.
Startup & Testing
We fill the system, purge air, test all safety controls, verify gas pressure, and confirm proper heat distribution.
Customer Training
We explain your new boiler's controls, how to check the water level (steam systems), and what maintenance is needed.
Warranty Support
We register your equipment and remain available for follow-up service and annual maintenance.
D's Air Installation Standards — Every Boiler Job
- Heat loss calculation and proper boiler sizing
- Near-boiler piping per manufacturer specifications
- Hartford Loop installation on all steam systems
- Backflow preventer and expansion tank on all hot water systems
- Gas line pressure test and leak check at all connections
- Flue venting verification — draft, clearances, and termination
- Low-water cutoff test and safety control verification
- Combustion analysis and CO test after startup
- City of Chicago permit pulled on every installation
- Equipment registered for full manufacturer warranty
What Our Customers Say
Based on Google Reviews — D's Air & Heating, Inc.
Marcus T.
Furnace Replacement
"D's Air & Heating did an outstanding job replacing my furnace. Darryl was professional, on time, and explained everything clearly. The installation was clean and the system works perfectly. Highly recommend."
Latoya W.
Boiler Repair
"Called D's Air when my boiler stopped working in January. They came out the same day, diagnosed the problem quickly, and had it running again within hours. Fair pricing and excellent service."
James R.
AC Installation
"Installed a new central AC system for us this summer. The crew was respectful of our home, cleaned up after themselves, and the system runs quietly and efficiently. Very satisfied."
Ready to Work With Chicago's Trusted HVAC Company?
D's Air & Heating, Inc. — Serving Chicago Since 2009. Licensed, Insured, No Contracts.
Why Choose Lennox?
D's Air & Heating is an Authorized Lennox dealer — Serving Chicago Since 2010.
Lennox products are recognized for advanced technology, quiet operation, exceptional efficiency ratings, and dependable performance in Chicago's demanding climate. Lennox systems are engineered for long-term reliability, comfort, and energy savings.
Why Choose D's Air & Heating?
D's Air & Heating is an Authorized Lennox dealer — Serving Chicago Since 2010.
Since 2010, our company has helped Chicago homeowners and businesses install and service Lennox equipment. We provide expert sizing, installation, startup, testing, maintenance, and long-term support for every Lennox product we install.
Lennox Boiler Installation & Service Features
- High-efficiency hydronic heating
- Compatible with radiators, baseboard, and radiant systems
- Quiet, reliable operation
- Smart controls and thermostat compatibility
- Lennox manufacturer warranty coverage
- Lower utility costs year-round
- Reliable Chicago winter performance
Professional Lennox Installation
Every installation includes equipment evaluation, proper system sizing, removal of existing equipment, professional installation, safety testing, airflow verification, and system commissioning to manufacturer standards. City of Chicago mechanical permits included on every installation.
Financing & Warranties
D's Air & Heating offers flexible financing options for qualified customers on all Lennox equipment installations. Ask about current Lennox rebates, manufacturer promotions, and seasonal offers available through our dealership.
- Lennox 10-Year Limited Parts Warranty — registered at installation
- Lennox 20-Year Heat Exchanger Warranty (select furnace models)
- 2-Year D's Air & Heating Workmanship Warranty
- Financing available for qualified customers — ask about current offers
- Current Lennox rebates and manufacturer promotions available
- No-contract service — no annual maintenance agreement required
Request Your Free Estimate
D's Air & Heating is an Authorized Lennox dealer — Serving Chicago Since 2010.
Contact D's Air & Heating today to schedule a free Lennox Boiler Installation & Service installation estimate and discover why Chicago homeowners continue to choose Lennox for dependable comfort and efficiency.
(773) 940-0965