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Find Central a/c service or repairers in Saint Charles

Avatar for Dunn Plumbing, Heating and Air Conditioning / Dunn One Hour Heating and Air Cond
Dunn Plumbing, Heating and Air Conditioning / Dunn One Hour Heating and Air Cond
4.7(
273
)

Serving Saint Charles, MO and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"Rob has been our serviceman for the past 2 years and is excellent. He takes the time to explain what is going on and is very professional. Will definitely use Dunn for future AC service needs."
Additional Photos
Response time2 days
20 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for SmartHouse Heating & Cooling
SmartHouse Heating & Cooling
4.7(
593
)

Serving Saint Charles, MO and surrounding areas

Approved

In business since 1947

Free estimates

Emergency services offered

"Marcus is great. He's serviced my house several times for both AC and furnace maintenance. He's very knowledgeable and thorough. Takes time to explain things and answer questions. Also offers suggestions, but doesn't pressure you. He's very efficient. Appears to be an honest HVAC tech and good guy."
Old boiler being removed
A Manual-J load calculation is performed to determine the precise amount of heating and cooling needed for each space.
Installing a Mitsubishi Hyper Heat Mini Split System to Heat and Cool this Sunroom Addition.
Mitsubishi outdoor unit installed on rooftop to heat and cool 3rd floor of this St. Louis City home.
Daikin FIT Heat Pump Installed in University City Home

+106

Response time3 days
5 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for Liberty Heating & Cooling
Liberty Heating & Cooling
4.8(
46
)

Serving Saint Charles, MO and surrounding areas

Approved

Super Service Award Winner

In business since 2017

Emergency services offered

Warranties offered

"Project: Repair or Service a Central Air Conditioning System Sam from Liberty is GREAT! I had my AC recharged earlier this year and they charged me $170 per pound for freon!! This is the dirty little secret..You (and they) can buy it for $29 a pound on the internet....so I lost the first round with SmartHouse??? overpaid for 2 pounds plus service call plus labor.....A month later. I accidetnally cut a hole in my line in the garage.lost 5 pounbds of freon.I called all the AC companies I could find and asked them how much per pound the cheapest was $85!! some for $150!! Oh they all lie to you "the price is going up" R22 freon will be outlawed in 2020 our costs have gone up" BS! they all want to stick you for maybe an extra $600 wihtout you knowing it if you need 5 pounds. They are all con artists and liars . I checked with about 5 companies and got the cheapeast bid of $1000 ish and most around $1300! I told them I knew about the mark up on freon and they all did their little tap dance. I finally found Sam on Craigslit under services rendered...Called him he said he would give me a fixed price he knew all about the markup scam! He got the job done for $525!! Sam is a hard worker and didint show up til 7pm and had one more call that night after me! He welded my pipe vac'd the system and charged it up as good as new! While most of these AC company rackets try to get rich off of each job. Sam has a different philosophy he gives a fair deall and justs works harder than everyone else and makes it up on volume. Also he is a one man company so he has very littel overhead...One slight complaint..he hinted that he would be over by 4:15 PM but didn't make it til 7pm as he has other jobs he said were"ahead of me" I suspecet he got a job that he would lose if he didnt take it right away and could tell I would wait....Just a guess....Anyway it was worth the wait ...they say you can get Good Fast OR Cheap Pick 2. Oh and here is a warning ..If you ask for after hours service from any of the established crooked companies get ready to pay $249 a pound for freon!!!! Less"
A/C replacement
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+10

6 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for SC Hosack Plumbing & Excavating
SC Hosack Plumbing & Excavating
4.8(
104
)

Serving Saint Charles, MO and surrounding areas

Approved

In business since 2006

Emergency services offered

Warranties offered

"The repairman was very courteous and professional Quoted a price before beginning repair. Also suggested the name of another company to help me with a concern that he was not qualified to do."
 30% tax credit
Vanity Bowl
Steam Shower
Kitchen
 Go Green

+3

8 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Hoffmann Brothers
Hoffmann Brothers
4.5(
43
)

Serving Saint Charles, MO and surrounding areas

Approved

In business since 2000

Emergency services offered

Credit card accepted

"I really appreciated the phone calls that kept me apprised of where the repairman was and how much longer it might take for him to get to my house. The repairman was really nice and he was not only able to figure out what was wrong with my dryer in no time, but he was able to repair it very quickly when the parts arrived. I would definitely recommend them and I will call them if I need another repair."
Installation
Installation
Heat Pump
Heat Pump
Furnace

+14

1 neighbors recently requested a quote
Recommended by97%of homeowners
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Showing 1-10 of 174
FAQs for central a/c service or repair projects in Saint Charles, MO

Coils work to absorb heat into the refrigerant that flows through them, moving heat from one location to another. For air conditioning, the evaporator coil inside the air handler in your home absorbs heat. It then transfers the heat outside to the condenser coil, where it releases it. The opposite process happens for heat pumps. When the coils get dusty and dirty, it reduces how well these components work.

Skip regular cleanings, and dirt, debris, and mineral deposits will blanket your evaporator and condenser coils. When that happens, the coils can’t shed heat efficiently, so the system works harder and your energy bill climbs. Over time, overheating strains the compressor and can trigger a full breakdown—an avoidable repair that often costs far more than a simple annual cleaning.

AC coil cleaning is an investment that pays for itself in the benefits it provides. Dust‑caked coils force your AC to run longer, so you spend more on electricity and rack up extra wear. A quick professional cleaning restores efficiency, trims monthly bills, and eases strain on expensive parts. Over the long haul, that small yearly fee delays pricy repairs and stretches the unit’s lifespan, making coil cleaning one of the smartest HVAC tune‑ups you can schedule.

Watch for higher electric bills, rooms that stay warm no matter how low you set the thermostat, or an AC system that runs nonstop. Extra humidity and frost on the coils are also red flags. Catching these clues early lets you schedule a quick cleaning before the system overworks itself and triggers an expensive breakdown.

Your AC cleaning technician starts by shutting off the power to the unit and removing the faceplate. Compressed air and a vacuum hose blast away loose debris, followed by a coil-safe, no-rinse cleaner that dissolves stubborn grime. After the solution has soaked in, the professional wipes the fins, reassembles the housing, and restores power, leaving the system ready to cool at peak efficiency.

The Saint Charles, MO homeowners’ guide to central a/c service or repairs

From average costs to expert advice, get all the answers you need to get your job done.