65+ Years of HVAC Service In St. Louis
If you get the "OH-NO!" when you turn on the AC...
Contact AL-DON and experience the best! Stay cool and comfortable with AL-DON Air Conditioning Specialists, the ultimate HVAC contractor in St. Louis.
- Top-notch service and installations by trained, qualified technicians. Your AC will be singing smoothly in no time!
- SEER2 energy calculator is super-efficient, telling you exactly how much you’ll save on utility bills.
- If you settle or less, you get less, everyday.


Technicians who are the experts
Always striving to offer the best there is
At AL-DON, we understand the frustration of dealing with AC issues. That’s why our dedicated technicians are here to solve your cooling problems efficiently. With rigorous training and a passion for excellence, they’re equipped to tackle any AC-related issue, ensuring your comfort year-round. Experience the difference with AL-DON.
Our Customers Say It Best on Google
We have been using AlDon for decades and have had Hector as our requested technician for many years. The quality of their service has been...Read More »
2 weeks ago via Google
Benjamin Schwartz
Best Heating and Cooling Company in the world 🌎 Arrived on time 👍 Jerry was very Friendly 😊 Most Professional, Constant Communication with what's going...Read More »
2 months ago via Google
Joahanna Harris
Hector came to check my furnace. When outside he could smell a bit of gas. He said he couldn’t locate the leak. He advised me...Read More »
a month ago via Google
mark whitson
Al-Don literally saved my family’s lives!! When receiving our yearly furnace maintenance, the technician noticed heat coming out of a wrong spot. I had mentioned...Read More »
5 months ago via Google
Julie Boyce
On the Saturday after Thanksgiving, my 84 year old Mother called to say her furnace was not working. Within 2 hours of my initial...Read More »
4 months ago via Google
Gretchen Moser