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Advanced System Design and Load Calculations

Professional load calculations serve as the cornerstone of effective HVAC design in new construction. We utilize industry-standard Manual J calculations to determine precise heating and cooling loads for each space within your building. These calculations factor in heat gain from sunlight, heat loss through walls and windows, internal heat sources from occupants and equipment, and infiltration rates based on construction quality. By avoiding the common mistake of oversizing equipment, we help prevent short cycling, excessive humidity, uneven temperatures, and premature system wear.

Our design process extends beyond simple BTU calculations to encompass complete system integration. Manual D ductwork design ensures proper airflow distribution throughout the building, while Manual S equipment selection matches system components for optimal performance. We carefully plan supply and return air pathways, considering noise levels, air velocity, and static pressure to create quiet, efficient systems that deliver consistent comfort to every room.

State-of-the-Art Equipment Options

Today’s new construction projects benefit from remarkable advances in HVAC technology. Variable-speed systems adjust output to match real-time demand, providing superior humidity control and energy savings compared to traditional single-stage equipment. Heat pump technology has evolved dramatically, with modern units delivering efficient heating even in subfreezing temperatures. Geothermal systems harness stable ground temperatures to achieve efficiency ratings exceeding 400%, making them ideal for environmentally conscious projects with available land area.

Communicating systems represent the cutting edge of HVAC control, with components that continuously share operational data to optimize performance. These smart systems can detect developing issues before they cause failures, automatically adjust settings based on weather forecasts, and provide detailed energy usage reports. Zoning systems divide buildings into independently controlled areas, allowing customized comfort settings for different spaces while reducing energy waste in unoccupied zones.

Commercial New Construction Expertise

Commercial new construction presents unique challenges that demand specialized expertise. Our technicians service everything from room air conditioners to 200-ton industrial chillers, bringing comprehensive knowledge to projects of any scale. We design systems for diverse commercial applications including office buildings, retail spaces, restaurants, medical facilities, and industrial complexes. Each building type requires specific considerations for ventilation rates, humidity control, air filtration, and equipment redundancy.

Building codes and efficiency standards continue to evolve, with many jurisdictions now requiring specific SEER ratings, AFUE percentages, and ventilation standards. We stay current with all local and national code requirements, ensuring your new construction project meets or exceeds regulatory standards while qualifying for available utility rebates and tax incentives.

Installation Excellence and Project Coordination

Successful new construction HVAC installation requires seamless coordination with other trades throughout the building process. We work closely with general contractors to schedule our rough-in work when framing and electrical systems are ready, ensuring ductwork and refrigerant lines are properly routed before walls are closed. Our installation teams follow manufacturer specifications precisely, using proper brazing techniques, nitrogen purging, and vacuum procedures to ensure contamination-free refrigerant systems.

Planning for the Future

New construction offers the unique opportunity to implement HVAC solutions that will serve your building for decades. Consider these forward-thinking strategies:

  • Oversized electrical connections: Installing higher-capacity electrical service during construction costs far less than upgrading later
  • Accessible equipment placement: Positioning units for easy maintenance access reduces future service costs
  • Expansion capabilities: Designing systems with growth potential accommodates future building additions
  • Smart technology readiness: Installing compatible thermostats and controls enables future automation upgrades

Quality service since 1962 means we’ve seen HVAC technology evolve dramatically, and we apply those decades of experience to every new construction project. Our customer-focused approach as a residential and commercial heating, air conditioning, and commercial refrigeration company ensures your new building receives an HVAC system designed for maximum comfort, efficiency, and reliability. With 24/7 emergency service backing every installation, we remain your trusted partner long after construction completes. 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
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
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
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
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
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
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
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
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
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
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
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
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
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
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 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
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

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