Autumn Air Company

All you need to know about your furnace or air conditioner is our phone number!


We are a service, repair or replacement air conditioning and heating company. We devote ourselves to fixing what you already own and have the ability to change out what you have in the event your equipment has failed to the point where it isn't economical to repair. Where repairs are concerned we carry the most common repair parts on the trucks. Even on a weekend we're a safe bet to have what you need. And we have the part stores emergency numbers for things that we don't have.


In the event you do need to replace your existing equipment either due to age or more likely due to the inefficiency of existing equipment we specialize in high efficiency equipment. We can install the latest multi staged furnaces, air conditioners and heat pumps. We have solutions for even running many staged thermostats on existing wiring where there is no way to get into the finished walls. We always will give you many options for any replacement that will fit any budget.

About Autumn Air Company

  • In Business Since 1977
  • Licensed For Commercial and Industrial Service in St. Charles County
  • Insured
  • Free Estimates
  • Business Hours: Monday to Friday - 8am to 5pm
  • 24 Hour Emergency Service Available
  • Major Credit Cards Accepted

Areas of Expertise

  • Forced Air and Heat
  • Central Air Conditioning Service and Repair
  • Furnace Repair and Service
  • Thermostat Repair and Reprogramming
  • Heat Pump Repair and Service
  • Humidifiers
  • Air Cleaners
  • Duct Work

Area Serviced in Missouri

  • Saint Charles
  • O'Fallon
  • Weldon Springs
  • Saint Peters
  • Lake Saint Louis
  • Wentzville
  • Chesterfield
Read what other says about us!
Have questions?
Autumn Air Company O'Fallon, MO 63366

If you need service please call or text our regular number at 636-939-3333 as emails might take up to 72 hours to read. We welcome any questions via emails.

Fill out and submit the form below with any questions, or comment you may have for us.

This field is required

This field is required

This field is required

This field is required