The short version: The CompressorFinder System Builder is a sizing aid, not a quote, not a design document, and not a substitute for a licensed mechanical engineer or a CAC-certified installer. The recommendations and figures it generates are useful first-pass numbers — defensible against published references (DOE, CAGI, ISO, Compressed Air Challenge) — but they don’t account for site-specific constraints, code requirements, electrical service, freight, install labour, permits, or local utility rebates. Read this page before relying on the output for any purchase, install, or compliance decision.
What the tool does
The System Builder takes a small set of inputs — use case, US state (for design dewpoint), pneumatic tools you’ll run, existing equipment on site, and optional topology preference — and returns:
- An estimated SCFM and PSI demand, computed from a per-use-case demand model and per-tool consumption ratings with a default 25% headroom factor and a configurable simultaneity slider.
- A topology recommendation (simplex / duplex / triplex) based on demand magnitude and duty hours.
- A dryer-type recommendation (refrigerated cycling / non-cycling / desiccant heatless / heated / membrane) keyed to the ISO 8573-1 water class for the use case + the state’s ASHRAE 1% summer design dewpoint.
- A ranked list of compressor candidates from the live CompressorFinder catalog, scored 0–100 against SCFM band fit, PSI margin (no margin = disqualified), tank-to-load rule of thumb, lubrication preference, mechanical-type preference, and the catalog row’s own completion score.
- A ranked list of dryer candidates, scored against demand-flow fit (≥ 1.1× hard floor), dryer-type family match, pressure dewpoint target.
- A flow diagram showing the recommended air train with per-stage pressure-drop estimates (aftercooler 2 PSI, refrigerated dryer 4 PSI, desiccant dryer 7 PSI, filtration 3 PSI — typical industry figures, not your specific equipment).
- An accessory checklist grouped by zone (pre-treatment / dryer-train / distribution / monitoring), filtered by the build’s topology + dryer + breathing-air + air-quality flags.
- A cost band: cheapest catalog compressor × topology count + cheapest dryer + a generic accessory bundle estimate ($180–$650 per item). This is a range, not a contracted price.
- An annual energy estimate: motor kW × duty fraction × 8,760 h × $0.13/kWh (US industrial average). Your actual rate, motor efficiency, and load profile will move this figure ±30%.
- A list of nearby installers from our installer directory, pulled by state, with one-click “email this build” routing.
What the tool does not do
- It does not produce a stamped engineering design. Anything required for permitting, plan-check, insurance compliance, or a sealed contractor bid must come from a licensed mechanical engineer or a certified compressed-air professional. If your application is medical, breathing-air, food-grade, pharmaceutical, or otherwise life-safety relevant, an independent design review is mandatory regardless of what this tool says.
- It does not perform a site survey. Existing piping condition + Δp, ambient temperature swings, ventilation capacity around the compressor, vibration / sound limits, condensate disposal under EPA + state rules, exhaust setbacks, and slab loading are all your site’s responsibility.
- It does not check electrical service. Single-phase availability, three-phase voltage drop, breaker sizing, soft-start requirements, motor protection coordination, NEC compliance, utility interconnection — none of these are evaluated. A 50 HP three-phase compressor on a residential service is a non-starter regardless of how it scores.
- It does not check code compliance. Building code (IBC / IMC), local fire code, NFPA 70 + NFPA 99 (for medical applications), OSHA 29 CFR 1910.169 (compressed air receivers), and your AHJ’s local amendments all apply and are not enforced by the tool.
- It does not check installer credentials. The installer cards surfaced in the “Send to installer” pane come from our public installer directory; verification is best-effort and not warrantied. Always confirm an installer’s state license, manufacturer authorization (where required), insurance, and certification status (CAC Level I/II/III for compressed-air audit work) before signing a contract.
- It does not enforce a warranty path. Many compressor manufacturers void warranty if a non-authorized dealer commissions the equipment; check before purchasing.
Per-segment notes
Breathing air (SCBA, SAR, supplied-air respirator, dive)
Breathing-air systems are regulated under CGA G-7.1 (Commodity Specification for Air), EN 12021 (Europe), and OSHA 29 CFR 1910.134 (US occupational). A breathing-air system must include: a dedicated breathing-air-rated compressor; a CO + CO₂ monitor with shutdown interlock; a dewpoint of ≤ −65 °F (−54 °C); annual third-party purity testing to the CGA Grade D (or higher) standard; and proper sample-line geometry for the monitor. This tool’s “breathing-air” use-case recommendations only address sizing — they do not constitute a compliant breathing-air system design.
Medical (dental, lab, hospital)
Medical air in healthcare facilities is regulated under NFPA 99 and (in many jurisdictions) state Department of Health rules. Dental air requires Class 1 oil under ISO 8573-1 and must comply with FDA + ADA guidelines. Pharmaceutical and biopharma air may require GMP-validated monitoring + redundancy. This tool will not flag those requirements; consult a qualified medical-gas engineer.
Food / beverage / brewery (direct contact air)
Air in direct contact with food or beverage product must meet ISO 8573-1 Class 0 for oil + dewpoint appropriate to the product temperature. This typically means oil-free compressor + activated-carbon polishing filter + downstream dewpoint validation. FDA + USDA regulations apply; SQF / BRC / 3-A audit findings may add requirements. Sized recommendations here are starting points only.
Snowmaking + dive fill + ski resort + high-pressure
High-pressure applications (above 250 PSI working pressure) often use multi-stage compressors, water-cooled aftercoolers, and specialized pressure vessels with stricter inspection regimes (ASME Section VIII). Code requirements (NBIC for vessels above 5 ft³ or 250 PSI) apply. This tool’s high-PSI recommendations are sizing-only.
Data sources + methodology
The numbers in this tool come from public engineering references:
- U.S. Department of Energy — Improving Compressed Air System Performance: A Sourcebook for Industry, third edition, DOE/GO-102003-1822. Used for the kW-from-HP formula, the duty-cycle energy-loss model, and the VSD savings reference (35% average).
- Compressed Air & Gas Institute — Compressed Air & Gas Handbook, 7th edition. Used for the per-class isentropic efficiency baselines, the tool-air-consumption appendix, and the controller-class taxonomy.
- Compressed Air Challenge — Best Practices for Compressed Air Systems, 3rd edition. Used for the duplex / triplex compatibility rules, the per-segment energy targets, and the ROI math.
- ISO 8573-1:2010 — Compressed air contaminants and purity classes. The particulate / water / oil triplet shipped with each use case is a defensible baseline target; verify against your end-application requirement.
- ASHRAE Climate Design Conditions 2021 — Summer 1% design dewpoint. Used for the per-state humidity lookup that drives the dryer-type recommendation.
- EPRI TR-114398 — Industrial Compressed Air Systems Optimization Guide. Used for the VSD vs sequencer retrofit ROI worked examples.
- Per-manufacturer specification sheets — Ingersoll Rand, Chicago Pneumatic, Sata, DeVilbiss, Iwata, 3M, and others for the per-tool SCFM ratings.
Where this tool’s heuristic differs from a manufacturer-published value, the manufacturer value should be trusted for that specific equipment. The heuristic is intentionally conservative to avoid under-sizing.
Catalog & pricing data
The compressor and dryer catalog is hand-curated and re-verified on a rolling cadence by both human editors and a verification agent that re-fetches manufacturer pages, hashes the spec values, and flags drift over 5%. Prices are pulled from public retailer pages (Home Depot, Northern Tool, Compressor World, Air Compressors Direct, Quincy, ELGi, Ingersoll Rand dealer portals, and others) and labeled with the date verified. Prices on the site are point-in-time observations, not offers. Always confirm the current price + availability with the retailer or installer before purchasing. Some retailers (Atlas Copco, large industrial brands) operate dealer-portal-only pricing — for those the catalog surfaces a manufacturer or dealer-locator URL instead of a number.
Installer directory
The installer directory at /installers/ is compiled from public sources (manufacturer dealer-locators, state contractor licensing databases, NFPA-CAC certification rosters, trade-association directories). Where possible we verify the company is active, has a website, and lists service offerings. We do not accept payment for placement, and a listing does not constitute endorsement or warranty. The “nearest installers” feature on the System Builder uses the installer’s `primary_state` field as the matching key — installers may serve regions beyond their listed state, and may decline jobs outside their service area. Always confirm directly: state license number, manufacturer authorization (for warranty work), liability + workers’ comp insurance, CAC certification level (where applicable), and references for similar projects.
Limitation of liability
CompressorFinder, its operators, contributors, and the synthetic editorial bylines used during catalog buildout provide this tool on an “AS IS” basis without warranty of any kind, express or implied. To the maximum extent permitted by law: CompressorFinder shall not be liable for any direct, indirect, incidental, consequential, or special damages arising from use of the System Builder, the catalog, the installer directory, or any output generated by these tools — including but not limited to under-sizing, over-sizing, equipment incompatibility, code violations, install costs, downtime, lost productivity, energy costs, or warranty disputes. The user assumes full responsibility for verifying recommendations with a licensed professional before commissioning equipment.
If you believe a recommendation here is materially wrong or a catalog entry has incorrect specs, please tell us. We update on cited evidence.
Updates to this disclaimer
This disclaimer was last updated 2026-05-27. We’ll revise it as the System Builder’s logic changes (the version that built your recommendation is logged in the URL hash). Material changes will be flagged in the page’s “Last updated” line.