St. Charles & St. Louis County’s Premier Heating and Cooling Team


About Us

Fresh Air Heating and Air Conditioning has been serving both St. Charles and St. Louis Counties since 1947.  We have a reputation of excellence in our service, installations, and our products.  For 68 years,  we have provided indoor comfort solutions for our valued customers and beloved community.  With our 100 percent satisfaction guarantee, we prioritize your satisfaction and our workmanship.

Whether you require service, maintenance, or replacement for your home’s heating or cooling system, our NATE, NCI, and locally-certified technicians get the job done right—the first time. To remain the best in the HVAC industry, Fresh Air employees:

  • Provide competitive rates while providing excellent service
  • Answer the phone in person, 24/7
  • Arrive on time and respect your schedule
  • Undergo rigorous training & continuing education
  • Hold the latest certifications in excellence & safety
  • Guarantee 100% satisfaction
  • Ensure satisfaction through follow-ups


Need Service NOW?

Call 636-530-0070 to schedule a quick, professional diagnosis. Want to know who we are before you call? We don’t blame you. Check out our team here. Click here to read about our rates and service area.



Since its start in a home office in 1987 by Mike and Meg Sinn, Fresh Air has been in the customer service business.  They grew through referrals and excellent service thanks to a relentless work ethic. With a large family to raise, failure wasn’t an option.  Steadily their business grew from a company operating out of a home office to eventually one with their own building in the Chesterfield Valley. Their building is surrounded by other successful Chesterfield companies; Chesterfield Fence and Deck, and Belfor Restoration. Today, Mike and Meg’s children (seen below) own and manage the business where they continue to understand the simple fact that happy customers lead to a successful business.


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Service Manager/President – Katie Sinn

Sales Manager/Vice President – Tim Sinn

Installation Manager/Treasurer – Pat Sinn

Sales & Quality Compliance/Secretary – Kevin Sinn

With a combined experience of 56 years at Fresh Air the Sinn Family has excelled with a strong work ethic and an obsession for continuous improvement. Our success is driven by happy customers.


Meet our team here: Our Team

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