Index
Resources
One page that lists every public guide on the site. Use case walk-throughs for the four most common HVAC sizing scenarios, reference for the standards and tools BuildSolver runs, and the tier breakdown.
01 · Use case guides
How BuildSolver fits each job type
Retrofit HVAC sizing — no blueprint required
Manual J for replacement and upgrade jobs that never had original drawings. Describe the building from your site visit; get a defensible number.
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Replacement AC sizing calculator
Single-aggregate residential AC swap. Brand-agnostic, conversational, mobile-first. Same Manual J procedures as Carrier HAP, without the brand lock.
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Manual J for new construction
Preliminary load calc during design development — before drawings are stamped. For framing decisions, bid prep, and design review.
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When is permit-grade Manual J required?
Honest guide to AHJ Manual J requirements by state, and why BuildSolver isn't the right tool for permit submittal.
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02 · Tools
Individual calculation tools
Manual S equipment selection
Sensible / latent capacity match-up against AHRI-rated equipment at design conditions. Half-excess-latent reallocation rule built in.
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Manual J calculators by state
State-specific load calc pages with local ASHRAE design temps, IECC version, and HVAC contractor licensing context. Big-5 states plus Fill-5 in the pilot batch.
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More tool landings are in flight — cooling load, heating load, duct sizing, psychrometric state. Use the chat for any of these today.
03 · Reference
Methodology and product reference
Or just open the chat
All of the use cases above run through the same chat interface. If you already know what you need, skip the guides and calculate yours directly.