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Proudly Serving Greensburg, PA and surrounding areas

(724) 261-3634

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Common Air Conditioning Problems We Repair

Refrigerant leaks represent one of the most frequent repair issues we encounter. These leaks not only reduce cooling efficiency but can also damage the compressor if left unaddressed. Our EPA-certified technicians use electronic leak detectors and ultraviolet dye testing to pinpoint leak locations accurately. Once identified, we repair the leak, evacuate the system to remove moisture and contaminants, then recharge with the correct refrigerant type and amount specified by the manufacturer.

Electrical component failures account for approximately 40% of air conditioning breakdowns during peak cooling season. Capacitors, which provide the electrical boost needed to start motors, frequently fail due to heat exposure and age. Contactors, responsible for controlling power flow to the compressor and fan motors, can develop pitted contacts that prevent proper operation. We maintain extensive inventories of these critical components, allowing us to complete most electrical repairs during the initial service visit. Our team also inspects wiring connections, as loose or corroded connections cause intermittent problems that can be challenging to diagnose without proper expertise.

Advanced Diagnostic Techniques

Modern air conditioning systems incorporate sophisticated control boards and sensors that require specialized diagnostic equipment. We utilize digital manifold gauges, temperature probes, and manufacturer-specific diagnostic tools to analyze system performance comprehensively. These instruments measure superheat and subcooling values, static pressure readings, and temperature differentials across coils, providing precise data about system operation.

Our diagnostic process includes:

  • System performance testing: measuring airflow, temperature splits, and electrical consumption
  • Component inspection: examining coils, drain lines, ductwork connections, and refrigerant lines
  • Control system evaluation: testing thermostats, safety switches, and control board operations
  • Efficiency analysis: comparing actual performance against manufacturer specifications

Emergency Repair Services

Air conditioning failures rarely occur at convenient times, which is why we provide 24/7 emergency service throughout Greensburg, Latrobe, and Irwin, PA. During extreme weather conditions, a malfunctioning air conditioner becomes more than an inconvenience—it poses health risks for vulnerable individuals and can damage temperature-sensitive equipment in commercial settings. Our emergency response team maintains fully stocked service vehicles equipped to handle most repairs immediately.

We prioritize emergency calls based on severity, giving precedence to customers with medical needs, businesses with perishable inventory, and facilities housing sensitive electronic equipment. Our commercial refrigeration expertise proves particularly valuable when servicing restaurants, grocery stores, and medical facilities where temperature control directly impacts operations and compliance requirements.

Preventive Maintenance and Repair Prevention

While we excel at repairing failed systems, we emphasize preventive maintenance as the most cost-effective approach to HVAC management. Regular maintenance visits allow us to identify potential problems before they cause system failures. During these visits, we clean coils, check refrigerant levels, test electrical components, and lubricate moving parts. Studies indicate that properly maintained systems experience 75% fewer breakdowns and operate 20-30% more efficiently than neglected units.

Our maintenance programs include detailed inspection reports documenting system conditions and recommending proactive repairs. By addressing minor issues early, customers avoid costlier repairs and extend equipment lifespan significantly. We service everything from room air conditioners to 200-ton industrial chillers, applying the same thorough approach regardless of system size or complexity.

Repair Versus Replacement Decisions

When facing significant repairs, customers often struggle with repair-versus-replacement decisions. We provide honest assessments based on equipment age, repair costs, efficiency improvements, and available utility rebates. Generally, systems over fifteen years old requiring major component replacements benefit from upgrading to modern high-efficiency equipment. Our comfort consultants design replacement systems specifically tailored to each customer’s needs, considering factors like building size, insulation levels, occupancy patterns, and budget constraints.

The HVAC industry continues evolving rapidly, with new refrigerants, smart controls, and efficiency standards changing available options. We specialize in installing state-of-the-art comfort systems, heat pumps, geothermal systems, communicating systems, and zoning systems that provide superior comfort while reducing operating costs. Our customer-focused approach ensures we recommend solutions that genuinely benefit each client rather than pushing unnecessary replacements. Contact us today.

Your Comfort is Our Priority

Ready to Experience the Donahue’s Difference?

Don’t let another day go by with an uncomfortable home or unreliable HVAC system. For over 60 years, Donahue’s Heating & Cooling has been Greensburg’s trusted choice for expert HVAC solutions, emergency repairs, and comprehensive maintenance services. Our NATE-certified technicians are standing by 24/7 to restore your comfort and peace of mind.

Whether you need immediate emergency service, want to schedule routine maintenance, or are ready to upgrade to a more efficient system, we’re here to help. Call 724-261-3634 now or fill out our contact form to get started. As a Carrier authorized dealer with our own sheet metal fabrication shop, we have the expertise and resources to handle any HVAC challenge.

NATE-Certified Technicians Ready to Help
Quality service you can count on!
Three Generations of Excellence
See Why Greensburg Chooses Donahue’s

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Over 60 Years of Trusted Service
Customer Reviews
First time dealing with Donahue. We received a quote from Mark the same day he came to look at the job (amazing). After meeting with the other companies we contacted, we decided to go with Donahue’s. From estimates to office calls/visit, to the installation crew, we could not have been...
Scott M.
Google Review
Great tech came to house to fix hvac Dillon was his name he explained everything it a way I could understand. He was very friendly and knowledgeable. If I need service again I will definitely be requesting him.
Brandon R.
Google Review
Dillon was our service tech, and did a great job on both service calls! He first did our furnace maintenance, where he was personable and efficient. He explained that we needed to replace our combustion tank, and quoted us on the spot. His second trip was to replace the tank...
Wendy V.
Google Review
I have had Donahue’s provide Spring and Fall PM on both my heating and air conditioning units for a number of years. I am very impressed with both Dillon and Zach, who have performed the recent fall and spring PM visits. They were both very knowledgeable and courteous young men...
Ann P.
Google Review
I wanted in-ceiling mini splits and Dave Donahue came to my home to create an estimate and he was extremely professional and knowledgeable. The price was reasonable. The job was done promptly and finished earlier than the time frame promised His team was excellent. They were neat and tidy and...
Kelly E.
Google Review
One coldest days of year and my furnace shutdown. I used Donahue’s for years so I called asap . They had Zack at my house with in a hour and solved my problems. Happy day for me, furnace running perfect again . Excellent tech and office were both kind people...
David L.
Google Review
We switched to electric heat in 2022 from oil. A new variable speed air handler was installed by a different vendor, using the 3 zone control system that this vendor had installed in 2004. However, the original zoning controller was not capable of optimally using the capability of the new...
Daniel A.
Google Review
We could not be happier with the central A/C job that was done in our over 100 year old home. We were so worried about losing valuable space that we held off exploring this. Now we are asking ourselves why we didn’t do it sooner! The whole experience was professional....
Amy M.
Google Review
My in-laws were having low air flow with their central air conditioning system and called Donahues to address it. They were immediately put on a wait list, but were seen the next day! Dan came out and did a thorough inspection inside, changed the filter, and then thoroughly checked the...
Victoria B.
Google Review
Donahue’s service man was timely, courteous, professional very knowledgeable and answered my questions. He completed a thorough maintenance check of our furnace. I definately recommend Donahue’s Heating & Cooling. I will call them again in the future.
Susan F.
Google Review
We had Donahue’s clean our out vents and they did a fantastic job. Hunter, Tyler, Zack, and Kyle were all very respectful and were happy to answer any questions we had. I would strongly recommend using Donahue’s Heating & Cooling for your needs.
Anisa B.
Google Review
Donahue’s was amazing to deal with! Huge thank you to Todd the technician who fixed our air conditioner! Very knowledgeable and informative. I would highly recommend Donahue’s!!
Alicia P.
Google Review
Donahue’s service is second to none! My tech, Dillon, was outstanding and very professional! Will definitely use them for future services. A+
Deb R.
Google Review
I’ve used Donahue’s for a few jobs now, some small and some big, one was a full furnace replacement and I couldn’t be happier with the work they did for me. All their employees have been great, the latest was Rod, he replaced the gas valve on my hot water...
Andrew K.
Google Review
Just had my a/c get its checkup for the upcoming season and Jeremy from Donahue’s did an excellent job! He went the extra mile to make sure everything was done completely and thoroughly! Just started using Donahue Heating and Cooling and this was my second excellent experience.
Daniel C.
Google Review
Called to have service as my HVAC Unit wasn’t blowing cold this spring. They got me an appt for 2 days later, and called me a day earlier to let me know a tech was available. It worked for me so Zach came out and replaced a capacitor on my...
Matt G.
Google Review

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