Family Owned & Operated Since 1978 — Frankfort, IL
- Commercial HVAC
Commercial
HVAC Services
Rooftop units, refrigeration, ventilation, and maintenance contracts for
restaurants, retail, offices and facilities.
Commercial HVAC
Keep Your
Business Running
Downtime costs money. D & T provides dependable commercial HVAC service for restaurants, retail, offices, and multi-unit buildings across the Frankfort area — from rooftop unit replacements to scheduled preventive maintenance contracts.
- Priority emergency response
- All commercial brands serviced
- After-hours service available
- Custom maintenance contracts
- Refrigeration specialists
- Energy-efficient retrofits
What We Offer
Services Included
Comprehensive heating solutions for homes and businesses.
Rooftop Units (RTUs)
Service, repair, and replacement of all major commercial rooftop systems.
Commercial Refrigeration
Walk-in coolers, freezers, and refrigeration cases — installed and maintained.
Ventilation & Exhaust
Make-up air units, kitchen exhaust, and building ventilation systems.
Boilers & Chillers
Commercial boiler and chiller service for facilities of all sizes.
Energy Retrofits
Upgrade to high-efficiency commercial equipment and reduce operating costs.
Emergency Repair
Fast response so your business never stops cooling, heating, or selling.
- Trusted Since 1978
Signs You May Need Heating Service
From neighborhood restaurants to multi-tenant office buildings, we keep Frankfort-area businesses comfortable and operational.
- Restaurants & Bars
- Office Buildings
- Warehouses & Distribution
- Multi-Family Properties
- Retail & Convenience Stores
- Medical & Dental Offices
- Schools & Churches
- Industrial Facilities
Why D & T
The D & T Difference
Decades of trusted service for homeowners and businesses across the Frankfort area.
Family Owned Since 1978
Decades of trusted HVAC service in Frankfort, IL.
Honest Recommendations
Plain-language options — no upsells or surprises.
24/7 Emergency Service
Fast response when your system goes down.
Financing Available
Flexible options on qualifying installations.
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
FAQ
Answers to Common HVAC Questions
Don’t see your question? Give us a call — we’re happy to help.
Yes. We design custom preventive maintenance contracts that include scheduled tune-ups, priority emergency response, and discounted repair rates.
Contract customers receive priority dispatch with same-day response. We understand that downtime costs you revenue — we treat your call as urgent.
Absolutely. We service, repair, and replace walk-in coolers, freezers, refrigeration cases, and ice machines for restaurants, grocery, and food-service businesses.
Yes. We schedule installations and major service work after hours or on weekends whenever possible to minimize disruption.
Yes — we handle full RTU replacement including crane lifts, electrical, gas, and ductwork connections.
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.