Family Owned & Operated Since 1978 — Frankfort, IL
- Maintenance Plans
HVAC Maintenance
Plans
Seasonal tune-ups, priority service, and discounted repairs — for homes and businesses.
Maintenance Plans
The Smartest Way to Protect Your HVAC
Regular maintenance is the single best way to extend equipment life, lower energy bills, and prevent unexpected breakdowns. Our maintenance plans cover everything from filter changes to full seasonal inspections — for homes and commercial buildings.
- Two seasonal tune-ups per year
- 15% off all repairs
- Multi-system discounts
- Priority emergency dispatch
- No overtime fees
- Transferable to new owners
What We Offer
Services Included
Comprehensive heating solutions for homes and businesses.
Spring AC Tune-Up
Full inspection, cleaning, refrigerant check, and performance test before summer.
Fall Furnace Tune-Up
Combustion analysis, safety check, cleaning, and calibration before winter.
Filter Replacement
Standard filter swaps included on every visit to keep your system breathing clean.
Performance Reports
Detailed inspection reports so you know exactly how your system is performing.
Discounted Repairs
Members receive 15% off any repairs needed throughout the year.
Priority Scheduling
Front-of-line booking and priority emergency response — even on the busiest days.
- Trusted Since 1978
Trusted Since 1978 Why Maintenance Pays For Itself
Industry studies show preventive maintenance reduces emergency repairs by up to 95% and extends equipment life by years.
- Lower monthly utility bills
- Extended equipment lifespan
- Improved indoor air quality
- Consistent comfort year-round
- Up to 95% fewer breakdowns
- Maintains manufacturer warranty
- Catches small problems early
- Higher home resale value
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
Frequently Asked Questions
Don’t see your question? Give us a call — we’re happy to help.
Plans start affordably for residential single-system homes, with multi-system and commercial pricing available. Contact us for a custom quote based on your equipment.
Each visit includes a full safety inspection, cleaning, performance test, calibration, filter change, and a written report — typically 60–90 minutes per system.
Yes. Plans renew annually, and you can cancel before renewal. We're confident you'll see the value.
Yes. We offer custom commercial maintenance contracts for rooftop units, refrigeration, and full building HVAC systems.
Members get priority emergency dispatch, no overtime fees, and 15% off all repair work performed during the contract year.
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.