Air Conditioning

Air conditioning service.

AL-DON Indoor Air Quality Specialists is your #1 HVAC contractor in Creve Coeur, MO, and the surrounding communities. We are the leading company for all of your air conditioning needs. If you need repairs, maintenance, or a brand new system installed, the technicians at AL-DON Indoor Air Quality Specialists are the qualified and professional crew for the job.

We provide the highest quality service for your air conditioner. We also aim to educate and inform our customers. Informed decisions are good decisions. We want you to feel confident we are qualified to perform the service for which you are hiring us.

How Much Money Can a New Air Conditioner Save You?

Our SEER2 (Seasonal Energy Efficiency Ratio 2) energy savings calculator can help determine how much you could save on your utility bills. Simply enter your current unit’s SEER value and compare it to a newer, more efficient SEER2 unit. You can even customize it to better match your home’s system for a more accurate calculation..

SEER2 Energy Savings Calculator

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This calculator does not guarantee actual costs or savings and is only to be used for educational purposes.

Customize to Your Home

Adjust these settings for a more accurate calculation:




Rate (¢/kWH)


Average Annual Cooling Hours***

Historical Comparison

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** Data from U.S. Energy Information Administration
*** Data from 2002 EPA study

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Air Conditioning Basics

The four main components to your air conditioner are:

Condenser: The condenser is the outside metal unit and where the gas from the compressor is condensed into a liquid. The gas entering the condenser is very hot. The temperature is then lowered, so the gas can convert back to a liquid.

Compressor: The compressor is inside the condenser. It circulates the pressurized refrigerant, to concentrate the heat, and changes the low pressure gas to high pressure.

Evaporator: The evaporator is the part of the system inside the home. In simple language, it absorbs the heat from your home.

Expansion Valve: The expansion valve controls the amount of refrigerant in your system.

All of these pieces are connected by a copper tube that handles refrigerant, creating a closed loop. Heat is collected in the evaporator, sent outside to the condenser. The heat is removed, and the cool air is recirculated back into your home.

AC Facts

An Air Conditioner Doesn’t Create Cool Air.
What happens in the AC process is actually the removal of heat from the air. Your AC uses a chemical called refrigerant to remove heat and transfer it outside. The warm air runs through the lines and coils in your unit and goes from liquid to gas and back again. During this process, the refrigerant removes the heat and transfers it elsewhere so that when the air comes out the other side, it is cool.

Your AC Will Remove Humidity.
Lower humidity helps the overall comfort level in your home by making you feel cooler, even if the temperature is the same.

Your Air Filter Needs To Be Checked And Replaced Every Three To Six Months.
(depending on the manufacturer’s recommendations)
A dirty air filter restricts your air flow, which reduces efficiency, costing you money, and over time can put stress on your unit and could cause a costly repair.

Maintenance, Maintenance, Maintenance.
Your air conditioner needs regular checkups to keep it running in tip-top shape. Having regular annual preventative maintenance will bring your system longer life and fewer breakdowns over all.

The Seasonal Energy Efficiency Ratio (SEER) measures air conditioning and heat pump cooling efficiency, which is calculated by the cooling output for a typical cooling season divided by the total electric energy input during the same time frame. A higher SEER rating means greater energy efficiency.

At AL-DON Indoor Air Quality Specialists, we provide all the services you need to keep your AC running in top-notch shape. Call us at 314-567-5585 for repairs, maintenance, or new-system installation.

Air Conditioner Maintenance in Creve Coeur, 63141

“Wanted to give a shout out to Leslie, the dispatcher, who does an outstanding job! Always courteous and patient. Thank you Leslie!”
- Ashley G.

Air Conditioner Maintenance in Richmond Heights, 63128

“Hector has always provided the most “top shelf” service. We started using AL-DON over 20 years ago and have never been disappointed! Hector is an excellent service technician, is honest, and is always providing the right information to make the customer comfortable with the decision(s) we have to make! Kudos to your team!”

- Ray B.

Air Conditioner Replacement in St. Charles, 63301

“My wife and I recently bought a house that supposedly had new Goodman AC unit installed in February 2022. AC unit broke down Tuesday, August 2. Al-Don Tech Alex was able to come out that day after my other HVAC company I use could not send a technician. Alex was able to diagnose that the compressor went bad due to faulty installation. Alex was able to convince Goodman to replace the entire unit instead of replacing the compressor due to back order shortages on compressors. This news was received on Wednesday, August 3. Al-Don Technician (unsure if it was Ed, Jeff or Skyler) came out to replace the bad unit with the new unit. It was then determined that the copper lines and evaporator coil were damaged to to freon leakage turning acidic. Long story short, the new unit was installed, new lines and evaporator coil along with a new circuit for the breaker was also installed. A one man job turned into a 3 man job, but in the end I now have working air conditioning during the hottest month of the year along with information needed to attempt restitution was original installer. Plus your operator Leslie is top notch and was very helpful and understanding. Highly recommend to anyone, especially in an AC emergency, to give these guys a call.”

- Matthew C.

Air Conditioner Repair in Glencoe, MO 63005


– Jean G.

'- Jean G.

Air Conditioner Maintenance in St. Louis, MO 63124

“Al-don always reliable , helpful and prompt. Everyone that works there is super nice. The only choice !”

– Sherry W.

'- Sherry W.

Air Conditioner Maintenance in Ballwin, MO 63021

“Technician was extremely courteous and very professional.”

– Cathy M.

'- Cathy M.

Air Conditioner Repair in Wildwood, MO 63038

“Alex is an exceptional tech. He has been to my house for several maintenance checks and is extremely polite and professional, asset to your company”

– Debbie R.

'- Debbie R.

Air Conditioner Repair in St. Louis, MO 63126-2608

“Hector and Alex are very professional and knowledgeable technicians. Both men went above and beyond during their service call. We will gladly continue to use Aldon.”

– Bruce J.

'- Bruce J.

Air Conditioner Repair in Kirkwood, MO 63122

“Just wanted to do a shout out for Hector. The start capacitor on my AC went out late Saturday afternoon and we had to be at an outdoor graduation party by 8:00. Hector was able to get to my house, diagnose and get the AC up and running by 7:30. Returning to a warm house after an evening outdoors on a very warm night would have been miserable!”

– Ron S.

'- Ron S.

Air Conditioner Installation in Chesterfield, MO 63017

I was very pleased with the installation of the new air-conditioner, furnace and water heater. Tough job in a very small closet on the second floor. The installers were very professional and polite. They worked together to solve every issue along the way (and there were several) and left no mess behind. My sincere thanks for a job well done from the receptionist who set up the appointments to the installers. I will definitely recommend your company if asked for a referral.”

– Sandy S.

'- Sandy S.

Need Air Conditioner Service?

Contact the experts at AL-DON Indoor Air Quality Specialists.

Call us at 314-567-5585!