Professional design services that match your building's heating and cooling needs with the right equipment and controls
HVAC system design is the engineering process that determines equipment selection, duct sizing, airflow calculations, and control sequences for your building's mechanical systems. Our design engineers perform load calculations to size chillers, boilers, air-handling units, and rooftop units based on your facility's thermal requirements. We create mechanical plans showing ductwork layouts, piping networks, and equipment locations that meet ASHRAE standards and local mechanical codes. Every design includes sequence of operations for building automation systems, DDC controllers, and zoning systems. Our commissioning agents verify that installed equipment performs according to design specifications and achieves target efficiency ratings like SEER, EER, and COP values.
Our mechanical engineers and HVAC engineers bring decades of experience designing central plants, air distribution systems, and thermal control solutions for commercial buildings. We perform detailed CFM calculations and static pressure calculations to size ductwork that delivers conditioned air without excessive noise or energy waste. Our design process includes equipment selection for chillers, boilers, heat pumps, and packaged units from top manufacturers, ensuring you get reliable performance and strong warranty coverage. We specify variable frequency drives, economizer controls, and demand control ventilation to reduce energy consumption while maintaining indoor air quality and thermal comfort.
Every mechanical system we design includes comprehensive control sequences that coordinate supply air temperature, building pressurization, and humidity control across multiple zones. Our design drawings show equipment room layouts, mechanical plans with duct systems, and P&IDs for hydronic piping networks. We work closely with sheet metal contractors, controls contractors, and balancing contractors during installation to ensure the built system matches design intent. Our commissioning services include startup procedures, testing protocols, and performance verification that confirms your new HVAC system operates efficiently and meets all design conditions.
Your building needs professional HVAC system design when you're constructing new facilities, adding square footage, or replacing aging mechanical equipment that no longer meets your heating and cooling requirements. Existing buildings with comfort complaints, temperature control problems, or high energy bills often have undersized equipment, poorly designed duct systems, or inadequate ventilation rates that only proper system design can fix. If your facility manager reports constant service calls, your maintenance technicians spend excessive time troubleshooting equipment failures, or your utility costs keep climbing despite repairs, your mechanical system likely wasn't designed correctly for your building's thermal loads.
Renovations and tenant improvements require updated load calculations because changes to building envelope, occupancy levels, or equipment density alter your cooling load and heating load requirements. You can't simply add another rooftop unit or split system without analyzing how it affects air distribution, building pressurization, and existing ductwork capacity. Buildings with indoor air quality complaints need ventilation system design that calculates proper outdoor air quantities, specifies makeup air units or energy recovery ventilators, and integrates CO₂ sensors for demand control ventilation.
Facilities pursuing energy efficiency improvements benefit from system design that evaluates high-efficiency chillers, variable refrigerant flow systems, radiant heating, or district energy connections. Our design engineers model different equipment configurations, compare seasonal efficiency ratings like SEER and AFUE, and calculate payback periods for upgrades. If you're installing building automation systems or upgrading from pneumatic controls to DDC systems, you need control sequences and system integration design that coordinates thermostats, sensors, actuators, and VFDs across your entire mechanical plant.

Professional design services that match your building's heating and cooling needs with the right equipment and controls
HVAC system design is the engineering process that determines equipment selection, duct sizing, airflow calculations, and control sequences for your building's mechanical systems. Our design engineers perform load calculations to size chillers, boilers, air-handling units, and rooftop units based on your facility's thermal requirements. We create mechanical plans showing ductwork layouts, piping networks, and equipment locations that meet ASHRAE standards and local mechanical codes. Every design includes sequence of operations for building automation systems, DDC controllers, and zoning systems. Our commissioning agents verify that installed equipment performs according to design specifications and achieves target efficiency ratings like SEER, EER, and COP values.
Our mechanical engineers and HVAC engineers bring decades of experience designing central plants, air distribution systems, and thermal control solutions for commercial buildings. We perform detailed CFM calculations and static pressure calculations to size ductwork that delivers conditioned air without excessive noise or energy waste. Our design process includes equipment selection for chillers, boilers, heat pumps, and packaged units from top manufacturers, ensuring you get reliable performance and strong warranty coverage. We specify variable frequency drives, economizer controls, and demand control ventilation to reduce energy consumption while maintaining indoor air quality and thermal comfort.
Every mechanical system we design includes comprehensive control sequences that coordinate supply air temperature, building pressurization, and humidity control across multiple zones. Our design drawings show equipment room layouts, mechanical plans with duct systems, and P&IDs for hydronic piping networks. We work closely with sheet metal contractors, controls contractors, and balancing contractors during installation to ensure the built system matches design intent. Our commissioning services include startup procedures, testing protocols, and performance verification that confirms your new HVAC system operates efficiently and meets all design conditions.
Your building needs professional HVAC system design when you're constructing new facilities, adding square footage, or replacing aging mechanical equipment that no longer meets your heating and cooling requirements. Existing buildings with comfort complaints, temperature control problems, or high energy bills often have undersized equipment, poorly designed duct systems, or inadequate ventilation rates that only proper system design can fix. If your facility manager reports constant service calls, your maintenance technicians spend excessive time troubleshooting equipment failures, or your utility costs keep climbing despite repairs, your mechanical system likely wasn't designed correctly for your building's thermal loads.
Renovations and tenant improvements require updated load calculations because changes to building envelope, occupancy levels, or equipment density alter your cooling load and heating load requirements. You can't simply add another rooftop unit or split system without analyzing how it affects air distribution, building pressurization, and existing ductwork capacity. Buildings with indoor air quality complaints need ventilation system design that calculates proper outdoor air quantities, specifies makeup air units or energy recovery ventilators, and integrates CO₂ sensors for demand control ventilation.
Facilities pursuing energy efficiency improvements benefit from system design that evaluates high-efficiency chillers, variable refrigerant flow systems, radiant heating, or district energy connections. Our design engineers model different equipment configurations, compare seasonal efficiency ratings like SEER and AFUE, and calculate payback periods for upgrades. If you're installing building automation systems or upgrading from pneumatic controls to DDC systems, you need control sequences and system integration design that coordinates thermostats, sensors, actuators, and VFDs across your entire mechanical plant.
PJ Mac HVAC Service & Repair specializes in comprehensive HVAC solutions, including timely AC system repairs, furnace servicing, tune-ups, AC and heating unit installations and replacements, duct work, dehumidifiers, and UV light installations. With over 32 years of experience led by Doug, our fully licensed (PA License #PA157168), insured, and highly trained technicians handle both residential and commercial needs across Southeastern PA, including Delaware, Montgomery, and Chester Counties. We provide emergency services at no extra cost, backed by our 100% Client Satisfaction Guarantee. Our technicians undergo background checks and drug testing, ensuring dependable service and long-lasting results that keep homes comfortable year-round. We've proudly served thousands with integrity, fixing what others can't.
PJ Mac HVAC Service & Repair offers prompt AC repairs, often same-day or emergency service at no additional cost, thanks to our 24/7 phone availability and fully stocked HVAC trucks equipped for most jobs. Our highly trained, fully licensed (PA License #PA157168), and insured technicians, with over 32 years of collective experience, diagnose and fix issues efficiently in Southeastern PA areas like Delaware, Montgomery, and Chester Counties. We stand behind every repair with our 100% Client Satisfaction Guarantee—if you're not happy, we'll return ASAP to make it right. Customers trust us for honest communication on repair vs. replacement options, ensuring reliable, long-lasting results during heat waves.
Yes, PJ Mac HVAC Service & Repair excels in furnace repairs for residential and commercial properties, drawing on over 32 years of expertise in diagnosing and fixing all furnace types in Southeastern PA, including Delaware, Montgomery, and Chester Counties. Our licensed (PA License #PA157168), insured technicians use professional-grade equipment and routine training to resolve issues quickly, even offering same-day and emergency service free of charge. Backed by our 100% Client Satisfaction Guarantee, we rarely need return visits unless unrelated problems arise. We explain pros and cons transparently, ensuring your family stays warm all winter with efficient, reliable repairs that homeowners across the region trust.
PJ Mac HVAC Service & Repair proudly serves Southeastern PA, including Delaware County, Montgomery County, Chester County, and nearby offices in Glen Mills, Paoli, Wayne, Bryn Mawr, Upper Darby, and even Clementon, NJ. With over 32 years of hands-on experience, our fully licensed (PA License #PA157168) and insured team provides prompt HVAC services like repairs, installations, and tune-ups across these communities. We answer calls 24/7, offer free estimates, and back all work with a 100% Client Satisfaction Guarantee. Local homeowners rely on our vetted technicians—who pass background checks and drug testing—for trustworthy, efficient solutions tailored to regional needs.
Absolutely, all PJ Mac HVAC Service & Repair technicians are fully licensed (PA License #PA157168), insured, highly trained, and undergo extensive background checks and drug testing for your peace of mind. With over 32 years of experience fixing HVAC systems in Southeastern PA, we've handled countless AC repairs, furnace fixes, and installations for residential and commercial clients. Our expertise ensures accurate diagnoses and quality work backed by a 100% Client Satisfaction Guarantee—we'll return ASAP if needed. Homeowners trust our transparent process and commitment to industry best practices, making us the go-to for reliable service across Delaware, Montgomery, and Chester Counties.
PJ Mac HVAC Service & Repair stands firmly behind every service with our 100% Client Satisfaction Guarantee. If you're not completely happy with our AC repairs, furnace fixes, installations, or any HVAC work, we'll repair your system again ASAP at no extra cost. This promise reflects our over 32 years of experience and commitment to excellence, as seen in our 5-star ratings. Our licensed (PA License #PA157168), insured technicians in Southeastern PA use proven techniques for lasting results. We've earned trust from thousands by prioritizing honest communication and quality, ensuring comfort in Delaware, Montgomery, and Chester Counties.
Yes, PJ Mac HVAC Service & Repair provides 24/7 emergency HVAC services, including same-day furnace and AC repairs at no additional cost. Our fully licensed (PA License #PA157168), insured technicians, backed by over 32 years of experience, arrive promptly with equipped trucks to handle breakdowns in Southeastern PA like Delaware, Montgomery, and Chester Counties. We guarantee satisfaction 100%, returning ASAP if issues persist. Homeowners appreciate our vetted team—background checked and drug tested—for fast, reliable fixes that restore comfort quickly, as evidenced by our outstanding 5.0/5.0 ratings and countless successful emergency calls.
PJ Mac HVAC Service & Repair offers transparent pricing with free estimates for AC repairs, tailored after our licensed (PA License #PA157168) technicians assess your system. With over 32 years of experience in Southeastern PA, we explain repair vs. replacement pros and cons upfront, avoiding surprises. Costs vary by issue, but our efficient, high-quality work—backed by 100% Client Satisfaction Guarantee and 5-star reviews—saves money long-term. Fully insured pros use industry-leading tools for lasting fixes in Delaware, Montgomery, and Chester Counties. Call 756-4822 for a prompt, no-obligation quote reflecting our commitment to honest, value-driven service.
If your AC stops, contact PJ Mac HVAC Service & Repair immediately at 756-4822 for fast emergency service. Our over 32-year experienced, fully licensed (PA License #PA157168), and insured technicians serve Southeastern PA, diagnosing issues like refrigerant leaks or compressor failures with precision. We provide honest advice on repairs versus replacement, backed by our 100% Client Satisfaction Guarantee. Vetted through background checks, our team ensures safe, efficient fixes that withstand heat waves in Delaware, Montgomery, and Chester Counties. Don't wait—our 24/7 availability and 5-star reputation mean quick restoration of cool comfort.
Yes, PJ Mac HVAC Service & Repair expertly installs and replaces AC and heating units, including energy-efficient systems that lower costs and boost home value. With over 32 years of experience, our licensed (PA License #PA157168), insured technicians inspect your Southeastern PA home to recommend optimal types like central, ductless, or packaged units for Delaware, Montgomery, and Chester Counties. We offer free estimates, 24/7 support, and back installations with a 100% Client Satisfaction Guarantee. Our trained pros ensure proper sizing and efficiency, earning trust through transparent processes and proven results for lasting comfort.
PJ Mac HVAC Service & Repair's furnace installation process starts with a free estimate from our licensed (PA License #PA157168), insured experts with over 32 years optimizing systems for Southeastern PA winters. We assess your needs for natural gas, oil, electric, or propane units, ensuring efficiency to cut costs in Delaware, Montgomery, and Chester Counties. Installation uses professional techniques for seamless integration, backed by our 100% Client Satisfaction Guarantee. Our vetted technicians communicate transparently, delivering reliable heating that performs year after year, as trusted by local homeowners for our commitment to quality and prompt service.
PJ Mac HVAC Service & Repair provides top-tier commercial HVAC services, including repairs, installations, and maintenance for businesses in Southeastern PA. Over 32 years of expertise enable our fully licensed (PA License #PA157168), insured technicians to handle complex systems efficiently across Delaware, Montgomery, and Chester Counties. We offer same-day emergency service, free estimates, and our 100% Client Satisfaction Guarantee for peace of mind. With background-checked pros using advanced tools, we minimize downtime and ensure compliance, earning 5-star ratings as the trusted choice for commercial comfort and reliability.
Common signs your furnace needs repair include unusual noises, weak airflow, uneven heating, frequent cycling, or rising energy bills—issues PJ Mac HVAC Service & Repair diagnoses daily with over 32 years of experience. Our licensed (PA License #PA157168), insured technicians in Southeastern PA quickly address these in Delaware, Montgomery, and Chester Counties using stocked trucks for same-day service. Backed by 100% Client Satisfaction Guarantee and 5-star reviews, we provide transparent fixes for lasting warmth. Don't ignore these warnings; call us 24/7 to prevent breakdowns and ensure safe, efficient operation.
PJ Mac HVAC Service & Repair recommends annual HVAC tune-ups—spring for AC, fall for furnaces—to maintain efficiency and prevent costly repairs. With over 32 years serving Southeastern PA, our licensed (PA License #PA157168), insured experts clean, inspect, and calibrate systems in Delaware, Montgomery, and Chester Counties. This extends unit life, cuts energy use, and is backed by our 100% Client Satisfaction Guarantee. Ask about our Comfort Club for priority service. Homeowners trust our thorough process, reflected in 5-star ratings, for reliable performance year-round.
Yes, PJ Mac HVAC Service & Repair handles all duct work, including cleaning, repairs, and installations to optimize airflow and efficiency. Leveraging over 32 years of experience, our fully licensed (PA License #PA157168), insured technicians in Southeastern PA address leaks or poor design in Delaware, Montgomery, and Chester Counties. We use industry-best practices for improved indoor air quality, backed by 100% Client Satisfaction Guarantee. Transparent assessments ensure cost-effective solutions, earning our 5-star reputation for enhancing system performance and home comfort reliably.
PJ Mac HVAC Service & Repair stands out with over 32 years of experience, fully licensed (PA License #PA157168) and insured technicians who pass rigorous background checks and drug testing. We offer 24/7 emergency service, free estimates, and a 100% Client Satisfaction Guarantee across Southeastern PA. Unlike others, we prioritize honest communication on repair vs. replacement, use equipped trucks for prompt fixes, and maintain 5.0/5.0 ratings. Serving Delaware, Montgomery, and Chester Counties with integrity, we fix what others can't, building trust through quality and transparency.
PJ Mac HVAC Service & Repair offers free, no-obligation estimates for all services, including installations, repairs, and tune-ups. Our licensed (PA License #PA157168), insured experts with over 32 years experience visit promptly in Southeastern PA to assess needs accurately for Delaware, Montgomery, and Chester Counties. Transparent pricing and detailed explanations build confidence, backed by our 100% Client Satisfaction Guarantee and 5-star reviews. Call 756-4822 or schedule online 24/7—our vetted team ensures honest, upfront quotes tailored to your HVAC requirements.
PJ Mac HVAC Service & Repair's Comfort Club offers priority scheduling, discounted tune-ups, and exclusive perks for members in Southeastern PA. With over 32 years of service excellence, our licensed (PA License #PA157168), insured team provides annual maintenance to prevent breakdowns in Delaware, Montgomery, and Chester Counties. Backed by 100% Client Satisfaction Guarantee, it ensures peak efficiency and savings, as reflected in our 5-star reviews. Join for peace of mind—our vetted experts keep systems running smoothly, embodying our commitment to long-term customer trust and comfort.
Contact PJ Mac HVAC Service & Repair anytime at 756-4822 or request online for 24/7 support across Southeastern PA. Our over 32-year experienced, fully licensed (PA License #PA157168), insured technicians respond promptly to offices in Glen Mills, Paoli, Wayne, and more, serving Delaware, Montgomery, and Chester Counties. Free estimates and emergency service come with 100% Client Satisfaction Guarantee and 5-star ratings. Background-checked pros ensure quick, trustworthy HVAC solutions—call today for the reliable service homeowners depend on.

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