A Rapidly Changing Industry

The HVAC and ventilation industry is undergoing one of its most significant periods of change in decades. Tightening energy codes, growing consumer demand for indoor air quality (IAQ) solutions, the phase-out of older refrigerants, and the rise of smart home technology are all converging to reshape how duct systems are designed, installed, and operated. Here's a look at the key trends defining the industry in 2025.

Trend 1: Smart Ventilation and Demand-Controlled Systems

Traditional HVAC systems run on a fixed schedule or simple thermostat calls. Smart ventilation systems, by contrast, continuously monitor indoor conditions and adjust airflow in real time based on occupancy, CO₂ levels, humidity, and outdoor air quality.

What This Means in Practice

  • Demand-controlled ventilation (DCV): CO₂ sensors in occupied spaces signal the system to increase fresh air delivery when occupancy rises and reduce it when spaces are empty — saving energy without sacrificing air quality.
  • Smart dampers and zone controls: Motorized dampers connected to home automation systems allow individual room control, eliminating the need to condition unoccupied spaces.
  • App-based monitoring: Homeowners can now monitor airflow rates, filter life, and IAQ metrics through smartphone apps connected to their HVAC systems.

Trend 2: Refrigerant Transition

The HVAC industry is in the midst of a major refrigerant transition driven by environmental regulations. Older high-GWP (global warming potential) refrigerants like R-410A are being phased down in favor of lower-GWP alternatives such as R-32 and the new A2L "mildly flammable" refrigerants including R-454B and R-32.

For duct professionals and contractors, this transition has important implications: new equipment may require updated handling procedures, safety training, and in some cases, modified duct and air handler configurations to accommodate different refrigerant properties.

Trend 3: Indoor Air Quality Takes Center Stage

Post-pandemic awareness of indoor air quality has permanently elevated consumer and commercial expectations for HVAC systems. The focus has expanded well beyond temperature control to include:

  • Filtration upgrades: Growing adoption of MERV-13 and higher filters, as well as HEPA bypass filtration systems integrated into ductwork
  • UV-C air purification: UV-C light systems installed inside duct systems to neutralize airborne pathogens
  • Energy Recovery Ventilators (ERVs) and Heat Recovery Ventilators (HRVs): These systems bring in fresh outdoor air while recovering energy from exhaust air, improving both IAQ and efficiency simultaneously
  • IAQ monitors: Standalone and HVAC-integrated sensors tracking PM2.5, VOCs, CO₂, and humidity in real time

Trend 4: Tightening Energy Codes

Building energy codes across many regions are being updated to require better duct sealing, higher insulation levels, and third-party duct leakage testing on new construction. The shift toward near-zero energy buildings means duct systems must be designed and built to much tighter tolerances than was common even a few years ago.

Contractors and installers who stay current with ASHRAE standards and local code updates — and who can demonstrate compliance through testing — will have a competitive advantage as these requirements become more widespread.

Trend 5: Heat Pump Adoption and Duct Compatibility

Heat pumps — both air-source and ground-source — are seeing rapid adoption as a cleaner alternative to gas furnaces. However, heat pumps typically deliver air at lower temperatures than gas systems, which can create comfort issues in duct systems that weren't designed with heat pump airflows and temperatures in mind.

This is driving renewed interest in proper duct sizing, zoning, and in some cases the adoption of ductless mini-split systems as a complement or alternative to traditional ducted distribution.

Looking Ahead

The common thread across all these trends is an industry moving toward greater intelligence, efficiency, and health consciousness. For homeowners and building managers, staying informed about these changes helps ensure that decisions made today — about duct materials, system types, and equipment — will remain relevant and code-compliant well into the future.

For contractors and HVAC professionals, the message is equally clear: ongoing education, certification, and adaptability are more important than ever in a rapidly evolving field.