Spring’s here, the AC’s about to start working overtime, and a lot of St. Louis-area homeowners are realizing their 15-year-old unit isn’t going to make it through another Missouri summer. If that’s you — and you’re already weighing whether repair one more time or just bite the bullet and replace — there’s something we want you to know before you sign anything with anybody: a new AC system performs only as well as the ductwork it’s blowing through.

That’s why, on every qualifying system install this spring, AAA Heating & Cooling is including free whole-home air duct cleaning (normally discounted on our duct cleaning coupon page ). No coupon. No fine print buried in the contract. It’s bundled in.

Why a Brand-New AC Doesn’t Fix Dirty Ducts

The new equipment is fine. The problem is what’s living in their ducts.

Most ductwork in homes built in the 1970s, 80s, and 90s — which describes a huge chunk of housing in St. Charles County, O’Fallon, and St. Peters — has never been professionally cleaned. Not once. Over 30 or 40 years, those metal channels collect drywall dust from the original build, pet dander, pollen tracked in from every spring, the residue from cooking, and (if anyone in the home has ever smoked) decades of nicotine film. Some of what we pull out of older returns, you wouldn’t believe without seeing it.

When you fire up a brand-new variable-speed system, it pushes more air through those same dirty ducts at higher pressure. All that buildup gets stirred up and redistributed through your home — into the air your kids are breathing, onto the furniture you just dusted, into the lungs of anyone with allergies or asthma. The new AC didn’t cause the problem. But it’s making it more visible.

The local track record matters here. One O’Fallon homeowner, after we put in a full HVAC system, kept it short:

What “Qualifying” Actually Means (No Surprises)

Some HVAC promotions are written so the qualifications eliminate everybody. Ours aren’t. A qualifying install for the free duct cleaning offer is any complete new air conditioning system AAA installs through August 31, 2026 — which covers most full-home AC replacements we do. Whether you’re putting in a basic single-stage unit or upgrading to a high-efficiency variable-speed system, you’re in.

Three Things to Ask Any HVAC Contractor (Including Us)

If you’re shopping multiple bids this spring — which you should — these are the three questions that separate honest contractors from the ones who’ll sell you the wrong size unit and walk away:

1. “Did you do a Manual J load calculation, or are you sizing this off square footage?” Manual J is the right answer. Sizing AC units by square footage alone is how homes end up with oversized systems that short-cycle, never dehumidify properly, and burn out compressors early.
2. “What’s the SEER2 rating, and what does the actual operating cost look like for my home?” Higher SEER2 isn’t always worth it — the payback math depends on your home, your usage, and how long you plan to stay. (Don’t forget to factor in Ameren Missouri HVAC rebates , which can shift the numbers significantly.) A good contractor will run the numbers with you.
3. “What’s the warranty on parts AND labor — and who handles the labor warranty?” A 10-year parts warranty from the manufacturer doesn’t mean much if the installer isn’t backing the labor. Ask who pays the technician if something fails in year three.

We answer all three on every estimate without being asked. It’s part of the Fair and Honest Pricing Guarantee we’ve operated under since 1970. (Want the longer view on how to protect a new system? Read our guide to HVAC maintenance and longevity.)

That “answering questions before you ask” is what long-time customers notice. A client who’s been with us for over two decades had this to say after their most recent system replacement:

One Family. Three Generations. 56 Years of Doing It Right.

AAA has been a family-owned business in the St. Louis metro since the Probst family bought it in 1975. Our technicians don’t work on commission, which means nobody at our company benefits from selling you a bigger system than you actually need. The recommendation you get is the recommendation we’d give our own parents.

Schedule Your Free In-Home AC Estimate

If your AC is 12+ years old, costing more to repair than it should, or just not keeping up with the upstairs bedrooms anymore, now’s the right time to start the conversation — before peak season hits and lead times stretch out.

Call AAA Heating & Cooling at (636) 397-3200 for a free in-home estimate. Mention this article and we’ll confirm the duct cleaning bundle on the spot. Same-day estimates are usually available throughout St. Charles and St. Louis County.

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