HVAC

What this trade is

HVAC covers heating, cooling, ventilation, and — in newer codes — mechanical balanced ventilation (HRV/ERV). Remodels that add square footage almost always require Manual J load recalculations and duct modifications, not just larger equipment.

Why a GC needs a verified hvac sub

Most GCs cannot read a Manual J. The HVAC sub is the specialist who owns load calcs, duct sizing, and code compliance for mechanical ventilation. A GC who uses the same HVAC sub across projects accumulates shared vocabulary — returns at the top of walls, linesets routed through chases instead of exterior walls, condensate handling — that shows up in livability.

Regulatory landscape

License structure varies by jurisdiction. AskBaily verifies against the licensing authority that applies to the project location — not the GC's headquarters. A few representative jurisdictions:

• California — CSLB
  C-20 (Warm-Air Heating, Ventilating and Air-Conditioning)

  Separate C-20 classification required for HVAC. Title 24 Part 6 energy compliance is the dominant regulatory constraint for new equipment.

  CSLB→
• Florida — CILB
  Class A or B Air-Conditioning Contractor

  Florida licenses HVAC as Class A (unlimited tonnage) or Class B (up to 25 tons) separate from the GC license. Hurricane strap requirements apply to exterior condensers.

  CILB→

Quality signals AskBaily tracks

Each declared sub accumulates these signals across projects. They appear on the sub's digital twin and on the GC's public sub-trade view.

• Manual J discipline

  Whether the sub performs Manual J on every addition rather than defaulting to square-foot rules of thumb.

• Heat-pump conversion experience

  Recent heat-pump retrofits — particularly cold-climate units — are now essential in most state energy codes.

Cross-trades

HVACsits at the edge of several other trades. Coordinated scheduling between these is the GC's core responsibility; the sub-trade graph makes the coordination visible across projects.