Family Owned & Operated Since 1978 — Frankfort, IL
- FAQs
Answers to
Common HVAC
Questions
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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.
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.
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.
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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.