Family Owned & Operated Since 1978 — Frankfort, IL
- Frankfort, IL · Family Owned Since 1978
Reliable Heating, Cooling & Refrigeration Services Since 1978
Family-owned and trusted for residential and commercial HVAC service,
installation, repair, and maintenance in Frankfort, IL and surrounding areas.
- Established 197
- Residential & Commercial
- Heating, Cooling & Refrigeration
- Family Owned & Operated
Welcome
Trusted HVAC
Service Since 1978
Since 1978, D & T Heating & Cooling has provided dependable HVAC service for homeowners and businesses. Our team handles heating, air conditioning, refrigeration, indoor air quality, ventilation, system replacements, maintenance plans, and commercial HVAC solutions.
Whether it’s a small repair, full system installation, rooftop unit service, or seasonal tune-up, our goal is to deliver honest work, reliable comfort, and long-term value.
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Our Services
Full-Service HVAC
Solutions
Residential and commercial heating, cooling, and refrigeration – done right.
Heating Services
Furnaces, boilers, heat pumps, repair and tune-ups.
Air Conditioning
Central AC, mini-splits, repair and installation.
Refrigeration
Commercial refrigeration sales, service & repair.
Installation
New systems, ductwork, thermostats and zoning.
Repair & Maintenance
Emergency repairs and preventive maintenance plans.
System Replacement
High-efficiency upgrades and energy-saving retrofits.
Indoor Air Quality
Filtration, humidity, ventilation and air balancing.
Commercial HVAC
Rooftop units, building service & maintenance contracts.
How It Works
Our Simple 4-Step
Process
From your first call to comfort restored — clear, honest, and on time.
Call or Book Online
Reach out for service, a quote, or emergency repair — we respond fast.
01
On-Site Diagnosis
Our techs assess your system and explain options in plain language.
02
Honest Repair or Install
Quality workmanship using proven equipment and brands you trust.
03
Comfort Guaranteed
We follow up to make sure everything runs perfectly all season long.
04
Built for Comfort
Year-Round Comfort
for Every Home
Whether it’s a brutal Chicago winter or a humid summer afternoon, our installations and tune-ups keep your family comfortable, your bills lower, and your air cleaner.
- High-Efficiency Equipment
- Cleaner Indoor Air
- Whisper-Quiet Operation
- Smart Thermostat Setup
- Lower Energy Bills
- Whole-Home Comfort
Residential HVAC
Keep your home comfortable year-round with professional heating, cooling, air quality, and maintenance services.
Commercial HVAC
Support your building, business, or facility with dependable commercial HVAC services, rooftop units, ventilation, repairs, replacements, and maintenance contracts.
What we install
Installation Services
- Central air conditioning systems
- Heat pumps — air-source & geothermal
- Boilers & radiant heating systems
- Air handlers & evaporators
- Zoning systems
- Furnaces — gas, electric, oil
- Ductless mini-split systems
- Whole-house ventilation systems
- New ductwork installation or replacement
- Thermostats & smart home integration
Keep systems running
Repair & Maintenance
- Furnace repair & tune-ups
- Heat pump repair
- Annual preventive maintenance plans
- Refrigerant recharge & leak repair
- Blower motor & capacitor repair
- Air conditioner repair & tune-ups
- Emergency repair services
- Filter replacement
- Thermostat calibration & replacement
- Condensate drain cleaning
Smarter, more efficient
Replacement & Upgrades
- Full heating & cooling system replacements
- Indoor air quality improvements
- Energy-efficient retrofits
- High-efficiency system upgrades
- Smart thermostat installations
- Incentive & rebate assistance
Specialized Services
Beyond the Basics
Indoor Air Quality
Ductless Systems
Geothermal Systems
Hybrid Systems
Commercial HVAC
Ventilation & Exhaust
CO & Smoke Detector Integration
Insulation & Home Sealing
Generator Hookups for HVAC Backup
Energy Audits
Warranty Services
Financing Options
Maintenance Contracts
Air Balancing
Humidity Control
Our Work
Real Jobs. Real Results.
A look at recent residential and commercial HVAC service from our team.
Furnace Servic
Rooftop HVAC Maintenance
Commercial HVAC Units
AC System Diagnostics
Heat exchanger crack
Refrigerant Service
Heating System Repair
HVAC Equipment Replacement
Why Choose Us
Built on Trust &
Experience
Family Owned Since 1978
Decades of trusted HVAC service for homes and businesses.
Residential & Commercial
From single-family homes to commercial rooftop units.
Heating, Cooling & Refrigeration
Full-service expertise across every system type.
Reliable Service Plans
Maintenance contracts that keep systems running strong.
Emergency Repairs
Fast response when your system goes down.
Honest Recommendations
Straightforward advice — no upsells, no surprises.
Financing Available
Flexible options on qualifying installations.
Priority Service Contracts
Front-of-line scheduling for contract customers.
Testimonials
What Our Clients Say
“D & T installed our new furnace and AC. Crew was on time, clean, and explained everything. Best HVAC experience we’ve had in 20 years.”
Karen M.
Frankfort, IL
“Our rooftop unit failed mid-summer at the restaurant. They had us cooling again the same afternoon. Lifesavers.”
Mike R.
Mokena, IL
“Honest, friendly, and fairly priced. Their maintenance plan keeps everything humming year-round.”
Diane T.
Tinley Park, IL
“Replaced our walk-in cooler compressor over a weekend. Saved our inventory. Highly recommend.”
Rob K.
New Lenox, IL
Brands We Service
All Major HVAC & Refrigeration
Brands
Carrier
Trane
Lennox
Rheem
Goodman
Bryant
Mitsubishi
Honeywell
FAQ
Answers to Common HVAC Questions
Don’t see your question? Give us a call — we’re happy to help.
We recommend a full tune-up twice a year — heating in the fall and cooling in the spring — to maintain efficiency and prevent breakdowns.
Yes — we offer flexible financing on qualifying installations so you can upgrade without straining your budget.
Absolutely. We service, repair, and replace rooftop units, refrigeration systems, and full commercial HVAC equipment.
We work with all major HVAC and refrigeration brands and recommend the best fit for your home, business, and budget.
Service Area
Serving Frankfort, IL & Surrounding Areas
Proudly serving Frankfort, Mokena, Tinley Park, New Lenox, Orland Park, Homer Glen, Manhattan, and surrounding communities with dependable heating, cooling, refrigeration, and commercial HVAC services.
24/7 Emergency Service
Need HVAC Service
You Can Trust?
Call D & T Heating & Cooling today or book online for professional heating, cooling, refrigeration, repair, installation, and maintenance services.