HVAC · Commercial · Residential

HVAC subcontractors, and the work they bid

Mechanical bids are hard to compare because they bundle equipment, sheet metal, controls and commissioning into a single number, and contractors draw the boundaries differently. Posting the scope with your equipment schedule gets you numbers built on the same assumptions — and if you're the mechanical contractor, it gets you scopes that were written properly before you priced them.

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What gets bid

Scopes HVAC bids usually cover

A posted scope can be any part of this. The more of it the drawings settle up front, the closer the bids come back to each other.

Equipment set — rooftop units, split systems, VRF, boilers
Ductwork fabrication, install and insulation
Refrigerant and hydronic piping
Controls and building automation integration
Test and balance
Startup, commissioning and owner training

Hiring HVAC crews

What to check before you award

Whether test and balance is independent: A contractor balancing and certifying their own installation is marking their own homework. On anything commissioned it is worth requiring an independent TAB agency, and worth knowing which bids assumed one.
EPA 608 and manufacturer certification: Refrigerant handling requires EPA Section 608 certification. Separately, many equipment warranties are only valid if a manufacturer-certified installer did the startup — so the cheap install can quietly cost you the warranty.
Where the controls scope stops: The boundary between the mechanical contractor's controls and the electrical contractor's power is the single most reliable source of missed scope on a fit-out. Get both bids to state it in the same words.

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Bidding HVAC work

What makes a bid win this trade

State equipment lead times and whether they're locked: Rooftop units and VRF equipment still carry long lead times. A quoted lead time and a confirmed order are different things, and GCs increasingly know the difference.
Define your controls boundary: Say exactly which devices, wiring and integration you carry and which you expect from electrical. Being the bid that removed the ambiguity is worth more than being the bid that was two percent cheaper.
Name what's excluded overhead: Curbs, roof openings, structural support and the electrical connection are the four things most often assumed by everyone and carried by nobody.

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Where HVAC scopes show up

Rooftop unit changeoutsTenant fit-out mechanicalVRF systems in multifamilyCommercial kitchen exhaust and make-up air

Whichever side you’re on, the record stays on the job — scope, bids, award, progress, invoices and the review at the end. See how a job runs, or what the plans cost.

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