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Avatar for Dunn Heating Air Conditioning and Plumbing
Dunn Heating Air Conditioning and Plumbing
4.7(
273
)
Central A/C - InstallCentral A/C - Service or RepairDuctless Mini-split A/C - Install or Replace+1 more

Serving Arnold, MO and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"I recently had a positive experience with Dunn Service regarding boiler issues, and I wanted to share my thoughts. The technician arrived promptly at the scheduled time and approached their tasks with expertise and precision, ensuring that all problems were thoroughly addressed. The pricing for their professional services was reasonable. Overall, based on my experience with Dunn Service—characterized by politeness, professionalism, and fair pricing—I would highly recommend their services to anyone facing heating and air conditioning issues."
Additional Photos
Response time2 days
28 neighbors recently requested a quote
Recommended by90%of homeowners
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Avatar for Mechanical Climate Solutions, LLC
Mechanical Climate Solutions, LLC
4.9(
66
)
Central A/C - Service or RepairCentral A/C - Service or Repair - For Business

Serving Arnold, MO and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"MCS was prompt, professional and very knowledgeable. I got a very positive impression that my furnace repair was in good hands. Given that the heating problem arose during a period of very cold conditions, MCS went the extra mile to make sure the part was obtained and installed ASAP. If I had need for this type of service again, I would definitely use MCS."
17 Seer 2 stage condensing unit.
Response time11 hrs
3 neighbors recently requested a quote
Recommended by98%of homeowners
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Avatar for Rhymes Heating & Cooling
Rhymes Heating & Cooling
4.8(
193
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceCentral A/C - Install - For Business+12 more

Serving Arnold, MO and surrounding areas

Approved

In business since 1993

Free estimates

Emergency services offered

"Installed new a/c, furnace, air filter, humidifier, and water heater. Very professional and helpful group."
Response time12 hrs
7 neighbors recently requested a quote
Recommended by98%of homeowners
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Avatar for Liberty Heating & Cooling
Liberty Heating & Cooling
4.8(
46
)
Central A/C - InstallCentral A/C - Service or RepairCentral A/C - Install - For Business+3 more

Serving Arnold, MO and surrounding areas

Approved

Super Service Award Winner

In business since 2017

Emergency services offered

Warranties offered

"I called, not knowing what was wrong with my air conditioning. They actually gave me a few possibilities, over the phone, one of which turned out to be the Culprit. No charge for the advice, they could have easily rip me off. But didn't. They won't give u the run around, and tell you somethings wrong when it's actually not."
A/C replacement
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+10

5 neighbors recently requested a quote
Recommended by93%of homeowners
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Avatar for Anton's Plumbing, Heating/Cooling & Energy Experts
Anton's Plumbing, Heating/Cooling & Energy Experts
4.7(
515
)
Central A/C - InstallCentral A/C - Service or RepairCentral A/C - Install - For Business+7 more

Serving Arnold, MO and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1979

Free estimates

Emergency services offered

"we had new gas-fired furnace and air conditioning system installed"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+18

Response time12 hrs
Response rate100%
19 neighbors recently requested a quote
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Avatar for Comfortable Carla's, LLC
Comfortable Carla's, LLC
5.0(
19
)
Central A/C - InstallCentral A/C - Service or Repair

Serving Arnold, MO and surrounding areas

Approved

In business since 1954

Free estimates

Emergency services offered

"I’ve used this company twice. My husband has a medical condition that is affected by heat. The first time the air conditioner wasn’t working they made every effort to assess the problem immediately when I explained the medical condition. At the time they corrected the problem I was advised the system was probably 20 years old and we may have to consider a new system soon. The second time I contacted Comfortable Carla’s was about 4-6 weeks later when the system wasn’t working again. This lead to a system replacement. I was provided with different options, my questions were answered and the installation was completed as quickly as possible, especially in view of my husband’s medical issue. The staff was was professional, efficient and kept me apprised all throughout the process. I highly recommend this company."
Double System Install
Double System Install
Double System Install
Furnace Replacement
Furnace Replacement

+1

Response time4 hrs
Response rate100%
39 neighbors recently requested a quote
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Perfect Air
4.7(
6
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+12 more

Serving Arnold, MO and surrounding areas

Approved

In business since 1982

Emergency services offered

Warranties offered

Founded in 1982. Team members that are drug tested and background checked insuring that the people in your home are safe. We specialize in repairing and replacing residential heating and air conditioning systems. "Fixed Right or It's Free"\nTechs available Sat & Sun call for appointment.

1 neighbors recently requested a quote
Recommended by100%of homeowners
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Avatar for Hoffmann Brothers
Hoffmann Brothers
4.5(
43
)
Central A/C - Service or RepairCentral A/C - InstallCentral A/C - Install - For Business+4 more

Serving Arnold, MO and surrounding areas

Approved

In business since 2000

Emergency services offered

Credit card accepted

"They were on time, efficient. Quality was excellent with a couple of hiccups, which they resolved the same when it failed inspection on hwh. I fixed furnace air leak myself with metal tape."
Installation
Installation
Heat Pump
Heat Pump
Furnace

+14

1 neighbors recently requested a quote
Recommended by97%of homeowners
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Avatar for All American Appliance Service Inc
All American Appliance Service Inc
4.5(
528
)
Central A/C - Service or Repair

Serving Arnold, MO and surrounding areas

Approved

In business since 1980

Free estimates

Emergency services offered

"I would highly recommend AAA Home Services! Excellent service and communication."
Additional Photos
Response time2 days
5 neighbors recently requested a quote
Recommended by89%of homeowners
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Adams Air Conditioning & Heating, LLC
4.5(
9
)
Central A/C - Service or RepairCentral Air Cleaner - Install or Replace

Serving Arnold, MO and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

Adams Air Conditioning & Heating LLC has over 30 years professional experience. We can service any AC unit and have you up and running. servicing the St. Louis area, we take pride in always being prompt, punctual and professional with every project that we complete. Free estimates, please call anytime - offer emergency service. \n

Response time4 hrs
Response rate89%
2 neighbors recently requested a quote
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FAQs for air conditioning projects in Arnold, MO

Most professional HVAC technicians require two to three hours to complete an expansion valve replacement. The timeframe depends on your unit's accessibility and whether additional repairs are needed. The process involves recovering refrigerant, removing the old valve, installing the new component, and recharging the system. Scheduling during less busy seasons may result in more convenient appointment times.

Operating your air conditioner with a malfunctioning expansion valve isn't advisable. Continuing to run the system could potentially damage other components, particularly your compressor, which is significantly more expensive to replace. If you notice performance issues like inconsistent cooling or unusual noises, it's best to have your system inspected before continuing regular use.

Expansion valves don't have a standard replacement schedule, as their longevity depends on system usage, maintenance frequency, and environmental factors. Regular professional maintenance helps identify potential valve issues before they cause system failure. Having your HVAC system serviced annually allows technicians to monitor component condition and recommend preventative replacements when necessary.

Refrigerant leaks require prompt professional attention. If your expansion valve is leaking, you'll likely notice reduced cooling performance and possibly hear hissing sounds near the unit. Addressing leaks quickly prevents further system inefficiency and avoids the environmental impact of released refrigerant. Your HVAC technician will need to repair the leak and recharge the system with the proper refrigerant type and amount.

Because many AC issues present similar symptoms, professional diagnosis is recommended. Problems like inadequate cooling, inconsistent temperatures, or strange noises could indicate expansion valve issues, but might also stem from refrigerant leaks, electrical problems, or airflow restrictions. A qualified HVAC technician has the tools and expertise to accurately identify the root cause and recommend appropriate repairs.

The Arnold, MO homeowners’ guide to air conditioning services

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

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