HVAC Tools by Watson Consulting

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Technical utility hub

Field guides for HVAC pros.

Two strands. Field guides written for techs who already know the trade, and sizing guides that answer the equipment questions homeowners and estimators actually ask. Each one links into the matching offline app when you need the calc in a crawlspace.

Guides

Manual J, equipment sizing, CSA F280, duct design, and A2L charging

The field guides are written for people who already do this work. There is no “what is a BTU” section, because a tech reading about friction rate does not need one. Each takes a question that comes up on real jobs — where one rulebook differs from another, why a field reading disagrees with a design number — and answers it at the level of detail you would want from a coworker who had already looked it up.

The sizing guides take the other end: what size unit a house needs, what the square-foot rule really costs you, and why a matched system is not the same thing as a new condenser. Those questions get answered badly all over the internet, and they are the ones that decide what somebody buys.

Where a guide touches a calculation you would otherwise do by hand, it links to the free browser tool that does it and to the offline app that does the full version. Every one of them states its sources and says plainly where the methodology stops and an assumption starts.

Meanwhile

Apps that already run offline