HVAC Services Built Around Your Comfort
Start with the category that matches your issue. From AC and heating to indoor air quality, boilers, ventilation, and smart thermostats, our Local 36 team can help you choose the right next step.
The Degenhardt Guarantee
Built to last — and backed in writing
Free Estimates
Know your options before you spend a dollar. Estimates on replacements and installs are always free — no obligation.
Same-Day Service
No heat or no cool? Call early and we aim to be there the same day — South St. Louis is our backyard.
Transparent Pricing
The price we quote is the price you pay. Clear, up-front pricing approved before any work begins — no surprise fees.
Licensed & Insured
Union-trained Local 36 and NATE-certified technicians, fully licensed and insured for your protection since 1984.
Main Service Categories
Choose a service hub
This page is intentionally simple: the cards below are the main category hubs from the Services menu, not every individual offering or city-specific service page.
Air Conditioning
Cooling repairs, replacements, tune-ups, and emergency AC help.
Heating
Furnace and heating repairs, installs, maintenance, and diagnostics.
Heat Pumps
Efficient heat pump repair, replacement, and seasonal service.
Ductless
Mini-split comfort for additions, upstairs rooms, and zoning needs.
Indoor Air Quality
Whole-home IAQ solutions that help your system and air work together.
Air Purification
Air purifier options for cleaner indoor air and better filtration.
Humidity Control
Humidifier and dehumidifier solutions for St. Louis seasons.
Ventilation Systems
Ventilation upgrades that improve airflow and stale-air control.
Smart Thermostats
Thermostat installation and setup for easier comfort control.
Boilers
Boiler service for older South City homes and hydronic systems.
Why Choose Degenhardt Heating and Cooling?
Honesty, expertise, and a commitment to exceeding your expectations every time.
24/7
Emergency Service
1984
Serving South STL Since
Union
Local 36 Trained