Winter Service Calls at Deljo Heating & Cooling
February 2021
Company Facts
Deljo Heating, Cooling & Plumbing at a Glance
The work
- Best for
- homeowners who want a century-old company and a maintenance agreement
- Primary service
- HVAC
Where
- Headquarters
- Chicago, IL
- Service area
- 15 cities
- Emergency service
- Yes, 24/7
Money and guarantees
- Free estimates
- Yes
- Financing
- Available
Editorial Review
Our Take on Deljo Heating, Cooling & Plumbing
More than a century in business, 4.9 from 3,442 Google reviews, read September 16, 2026, and over 3,800 active maintenance agreements make Deljo one of Chicago's most established HVAC firms. Its Mitsubishi Diamond Dealer status helps on ductless projects. One review describes a warranty dispute over a failed pump, so confirm how claims work.
Best for: homeowners who want a century-old company and a maintenance agreement
What We Like
- Serving Chicago since 1922
- 4.9 rating from 3,442 Google reviews, read September 16, 2026
- More than 3,800 active maintenance agreements, according to the company
- Mitsubishi Diamond Dealer for ductless systems
- Heating, cooling and plumbing with 24/7 emergency support
Things to Consider
- One review describes a dispute over a failed pump after installation
- License numbers are not listed on the website
- Not positioned as a budget option
Google Reviews for Deljo Heating, Cooling & Plumbing
Customer ratings shown here come from Google. They are separate from our editorial review above.
Google rating
4.9
Based on 3442 Google reviews
Review data updated September 16, 2026
Ranked#5of 10 hvac companies in Chicago, ILre-checked September 2026
Editorial Ranking
Why Deljo Heating, Cooling & Plumbing Made Our Top 10
It holds position 5 in 10 Best HVAC Companies in Chicago, IL.
See the Full Chicago RankingPositions cannot be bought
Services Offered
Specialties
- Ductless systems
- 24/7 emergency service
- Boilers
- Heating repair
- Heating tune ups
- Furnace maintenance
- Furnace installation
- Boiler repair
Areas Served
Based in Chicago, IL.
- Chicago, IL · HQ
- Lyons, IL
- Evanston, IL
- Lincolnwood, IL
- Morton Grove, IL
- Arlington Heights, IL
- Deerfield, IL
- Des Plaines, IL
- Elmwood Park, IL
- Glencoe, IL
- Glenview, IL
- Highland Park, IL
- Harwood Heights, IL
- Kenilworth, IL
- Lake Forest, IL
iAbout service coverage
Coverage is as the business describes it, cross-checked against where its recent documented work is. A company will often travel beyond the areas listed here for a large job and decline a small one at the same distance, so confirm your address before scheduling.
About Deljo Heating, Cooling & Plumbing
Deljo Heating, Cooling & Plumbing has been working in Chicago since 1922, which makes it one of the oldest names on any list of the city's HVAC companies. It is based on Bryn Mawr Avenue in the Sauganash area on the Far Northwest Side, and it serves Chicago plus suburbs such as Evanston, Skokie, Glenview, Des Plaines, Arlington Heights, Deerfield, Highland Park and Naperville.
The service list covers heating repair, furnace installation, boiler service, heat pump maintenance, cooling repair, air conditioning installation and ductless systems, plus whole-home humidifiers and indoor air quality products. Deljo also handles plumbing, including emergencies, drain cleaning and water heater installation. It works with Carrier and Mitsubishi equipment, describes itself as a Mitsubishi Diamond Dealer, and installs REME HALO air purifiers and Ecobee thermostats.
One number on its website says a lot: more than 3,800 active maintenance agreements. That many repeat customers on a plan suggests people stick with the company. The Google reviews back that up. One customer had both their own air conditioner and a tenant's unit fixed quickly, with low refrigerant and dirty fans sorted out in one visit. Another praised a team that arrived on time and answered every question. A technician named Gregory was thanked for explaining a damaged wireless transmitter in detail. One critical review describes an ejector pump that failed and flooded a basement soon after installation, with Deljo pointing to the manufacturer, which is worth knowing if you are buying plumbing equipment.
The Google profile lists Deljo as open 24 hours, and the website advertises 24/7 emergency support, free estimates and financing through Service Finance Company. License numbers are not listed on the pages we reviewed.
Who it suits: homeowners on the North and Northwest Sides and in the north suburbs who want a long-established company with a maintenance plan, and anyone planning a Mitsubishi ductless install. Who it suits less well: budget shoppers who want the cheapest quote in town.
Before signing, ask what the maintenance agreement includes, how equipment warranty claims are handled, and which license covers the work.
iWhere this information comes from
Company history, ownership and capability details on this page are provided by the business and reviewed by our editors for plausibility and consistency. They are not the same as the credentials block, where each item carries its own verification status and source.
Credentials
- Mitsubishi Diamond DealerMitsubishi ElectricReported
- Carrier Authorized DealerCarrierReported
- NATE Certified techniciansNATE (North American Technician Excellence)Reported
iWhat verified means here
Verified means we checked the credential against the authority that issues it and recorded the date. Reported means the business told us and we could not independently confirm it. We publish both, labelled, rather than dropping what we could not check.
Reputation by Source
We show each source separately rather than blending them into a single score, because they measure different things.
Google
4.9/ 5
3442 customer reviews
TenBestFind
Editorially reviewed
Ranked #5 in Chicago hvac, September 2026
Company Pricing & Estimates
What this company publishes about its own pricing.
- Free estimates
- Yes
- Financing
- Available
- Emergency callout
- Available 24/7
Local Market Pricing
What Chicago homeowners generally pay, independent of this company.
- AC replacement, existing ductwork
- $5,500–$9,500
- Heat pump replacement
- $7,500–$13,800
- Furnace replacement
- $3,500–$7,500
- Repair call
- $150–$600
Project Photos
Business-submitted, reviewed by our editors
Project Videos
From the company's own channel and website. Loads only when you press play.
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Deljo Heating, Cooling & Plumbing FAQs
How long has Deljo been in business?
Deljo has worked in Chicago since 1922, and its website reports more than 3,800 active maintenance agreements.
Does Deljo install Mitsubishi ductless systems?
Yes. Deljo describes itself as a Mitsubishi Diamond Dealer and offers ductless AC services along with furnaces, boilers and heat pumps.
Is Deljo Heating, Cooling & Plumbing licensed and insured?
We checked 0 of 3 credentials against the issuing authority. Verified items carry the date we checked; reported items are what the business told us and we could not independently confirm.
What areas does Deljo Heating, Cooling & Plumbing serve?
Chicago, Lyons, Evanston, Lincolnwood, Morton Grove, Arlington Heights, Deerfield, Des Plaines, Elmwood Park, Glencoe, Glenview, Highland Park, Harwood Heights, Kenilworth, Lake Forest. Coverage is as the business describes it, cross-checked against where its recent documented work is. Confirm your address before scheduling, particularly at the edge of a service area.
Does Deljo Heating, Cooling & Plumbing offer emergency service?
Yes, the company lists emergency availability. Response time depends on demand, and after a storm every company in the market is stretched.
What warranty do they offer?
Warranty terms are not on file. Ask for them in writing before work starts.
How was this profile built?
Credentials come from issuing authorities, ratings from the company's Google Business Profile with the date we read them, and the editorial take from our own review of estimates, warranty documents and public feedback. Anything the business told us is labelled as reported.
Can a business pay to improve its profile?
A business can subscribe to manage its own listing details, and it can buy a labelled sponsored placement. Neither changes a ranking position or the editorial assessment on this page.
Is Something Incorrect?
Business information changes. Tell us about an address, phone, website, service area, credential or ownership change, or let us know if this company has closed.
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iWhat claiming does
Claiming lets you correct and maintain the factual information on this profile. Claiming or upgrading a profile does not guarantee inclusion in a TenBestFind ranking and never affects ranking position, which is decided editorially.
About This Business Profile
- Last reviewed
- September 2026
- Profile last updated
- September 18, 2026
- Google review data updated
- September 16, 2026
- Sources checked
- Issuing authorities, Google Business Profile, Company website
- Sponsorship status
- No commercial relationship