Expert mechanical systems for ground-up builds, tenant fit-outs, and commercial projects across all construction phases
5 Highlights on New Construction HVAC
New construction HVAC involves designing, installing, and commissioning complete mechanical systems in buildings from the ground up or during major renovations. Our team handles everything from load calculations and equipment sizing to final test and balance, working closely with general contractors, architects, and mechanical engineers throughout every construction phase.
- Complete design-build capabilities including Manual J load calculations, Manual D duct design, and Manual S equipment selection for proper sizing and energy efficiency in residential, commercial, and light commercial applications
- Full rough-in and trim-out services with experienced sheet metal workers, pipefitters, and HVAC technicians who coordinate with other trades during framing, deck installation, and ceiling coordination to avoid clashes
- Advanced system options like variable refrigerant flow (VRF), dedicated outdoor air systems (DOAS), energy recovery ventilators (ERV), building automation systems (BAS), and zone control with smart thermostats for superior comfort and performance
- Rigorous commissioning process including startup procedures, air balancing with calibrated hoods and manometers, control calibration, refrigerant charge verification, and complete documentation with O&M manuals and startup reports
- Code-compliant installations meeting all mechanical code, building code, energy code, and ASHRAE standards with proper permitting, inspections, and coordination with inspectors through rough-in inspection and final inspection
Why Choose Our New Construction HVAC
PJ MAC HVAC Service & Repair brings decades of experience as a trusted mechanical contractor specializing in new construction projects. Our team understands the complexities of construction schedules, trade coordination, and the need for installations that pass inspection the first time. We work as a reliable subcontractor or prime contractor depending on project scope, maintaining clear communication with general contractors and owner's representatives throughout every milestone.
Our design-assist approach means we get involved during preconstruction and precon meetings to provide value engineering suggestions that save money without sacrificing performance. We perform detailed load calculations to ensure right-sizing rather than installing oversized equipment that wastes energy and creates comfort problems. Our sheet metal fabrication capabilities allow us to build custom ductwork, plenums, and transitions that fit perfectly within architectural constraints, eliminating the need for costly change orders due to coordination issues.
We install high-efficiency equipment from top manufacturers, focusing on systems with excellent SEER, EER, HSPF, and AFUE ratings that meet or exceed energy code requirements. Our technicians are trained in the latest refrigeration practices, including proper brazing with nitrogen purge, evacuation to proper micron levels, and precise refrigerant charge procedures. Every installation includes thorough testing, including pressure tests, leak detection, and verification of all safety controls like freeze stats, high-pressure switches, and low-pressure switches. We stand behind our work with comprehensive warranties and responsive service if any issues arise during the warranty period.
Signs You Need New Construction HVAC
Ground-Up Construction Projects
New construction HVAC becomes necessary when you're building a custom home, spec home, or tract home from the foundation up, or when you're developing commercial spaces like office buildings, retail centers, warehouses, or multifamily properties. Ground-up construction requires a complete mechanical system designed specifically for the building's heating load, cooling load, and ventilation requirements based on square footage, occupancy, envelope characteristics, and internal loads from lighting and equipment.
Shell and Core Projects
Shell and core or core and shell projects need base building mechanical systems installed during initial construction, with provisions for future tenant fit-out work. The mechanical contractor must coordinate with structural steel erection, roof deck installation, and framing to ensure proper placement of equipment curbs, roof penetrations, chases, soffits, and drop ceiling spaces for ductwork and piping. Proper coordination prevents conflicts where ducts would clash with structural members, electrical conduit, or plumbing lines, avoiding expensive rework during later construction phases.
Specialized Environmental Control
Projects requiring specialized environmental control need custom HVAC solutions beyond standard split systems. Data centers need precision cooling with tight temperature and humidity control. Healthcare facilities require specific ventilation rates, filtration levels, and pressure relationships between rooms. Laboratories need lab exhaust systems with fume hood controls and makeup air to replace exhausted air. Cleanrooms demand HEPA filtration, laminar airflow, and positive pressurization. Each application requires mechanical engineering expertise and equipment selection appropriate for the space conditioning requirements.
Energy-Efficient and Green Building Projects
Energy-efficient or green building projects pursuing LEED certification or net-zero performance need high-performance HVAC systems designed for minimal energy consumption. These projects often incorporate heat recovery ventilators (HRV), energy recovery ventilators (ERV), ground-source heat pumps, variable refrigerant flow (VRF) systems, demand-controlled ventilation with CO2 sensors, and building automation for optimal scheduling and setpoint reset strategies. The mechanical contractor must understand psychrometric principles, enthalpy calculations, and how to achieve balanced ventilation while maintaining indoor air quality (IAQ) and thermal comfort.
Retrofit Projects
Retrofit projects in existing buildings sometimes require complete mechanical system replacement when old equipment reaches the end of its service life or when building use changes dramatically. A warehouse conversion to office space needs upgraded ventilation, better zone control, and improved comfort cooling. Adding air conditioning to a previously non-air-conditioned building requires new condensers, air handlers, ductwork, controls, and electrical service upgrades. These projects blend new construction techniques with the challenges of working around existing building systems and occupied spaces.
