Family Owned & Operated Since 1978 — Frankfort, IL
- Cooling
Air Conditioning
Services
Central AC, ductless mini-splits, and heat pumps — repair, replacement, and
tune-ups you can count on.
Cooling
Beat the Heat With Reliable Cooling
Whether you need a quick AC repair, a high-efficiency replacement, or a routine tune-up, our technicians have the experience to get the job done right the first time. We service all major brands and provide upfront, honest pricing.
- Same-day AC repair available
- All major AC brands serviced
- Refrigerant leak detection
- Free replacement estimates
- Smart thermostat compatible
- Energy-efficient upgrades
What We Offer
Services Included
Comprehensive heating solutions for homes and businesses.
Central AC Repair
Diagnose and fix any central air conditioning issue, fast.
AC Installation
New high-efficiency systems sized and installed for maximum comfort.
Ductless Mini-Splits
Zone-by-zone cooling for additions, garages, and older homes without ductwork.
Heat Pump Service
Year-round heating & cooling with efficient heat pump systems.
Refrigerant Recharge
Leak detection, repair, and proper refrigerant charging for peak performance.
Annual Tune-Ups
Spring AC inspections to maximize efficiency and prevent summer breakdowns.
- Trusted Since 1978
Signs Your AC Needs Service
Don’t wait for a complete breakdown on the hottest day of the year. If you notice any of these issues, give us a call.
- Warm air from vents
- Strange noises or smells
- Unusually high energy bills
- Frequent on/off cycling
- Weak airflow
- AC won't turn on
- Ice on the unit
- Water leaks near unit
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.
We recommend a tune-up every spring, before peak cooling season. It catches small issues early and keeps your system running efficiently all summer.
A well-maintained central AC typically lasts 12–17 years. Replacement is often the smarter investment once units are 10+ years old and require frequent repair.
If your unit is over 10 years old, uses R-22 refrigerant, or repairs cost more than 50% of a new system, replacement is usually the better long-term value.
Yes. Mini-splits are perfect for additions, garages, sunrooms, or older homes without ductwork. We can recommend single- or multi-zone configurations.
Cost depends on system size, efficiency, and ductwork. We provide free in-home estimates with transparent, upfront pricing and financing options.
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.