This HVAC calculators hub gathers seven free tools for cooling tons/BTU/h, ACH→CFM ventilation, duct size, static pressure, fan laws, psychrometrics, and chiller tonnage—for workshop, warehouse, and facility planning.
Pick the step that matches your question—cooling size, ventilation, duct / ESP, or plant tons. All paths share the workflow below. For electrical feeder impact, continue to the Power Calculator hub.
HVAC calculators on this hub cover the practical decision chain: first-pass cooling and heating load (tons, BTU/h, kW), ventilation airflow (CFM from ACH), duct and ESP screening, fan affinity laws, psychrometric state points, and chilled-water plant tons. Use one structured flow for workshop, warehouse, and light-commercial planning.
Common HVAC Calculations
Estimate cooling size from floor area, ceiling height, occupancy, and climate band.
Convert sq ft rules of thumb to tons and BTU/h for budgeting (validate with Manual J before procurement).
Convert room volume and ACH targets to CFM for fan and duct screening.
Most popular — HVAC capacity / tonnage: Use the HVAC capacity calculator for hvac capacity calculator, hvac tonnage calculator, and facility cooling load screening (not Manual J shopping).
Need a CFM calculator? Start with the CFM calculator (ACH to CFM) for room ventilation airflow—not compressor CFM.
Need duct size / ductulator? After CFM is known, use the duct size calculator (velocity-method screen; 12×12 CFM chart; before Manual D).
For the HVAC cluster, cooling load sizing is the central knowledge entity—sensible and latent components, climate inputs, and rules of thumb tie into the size and ventilation tools on this hub. Start with the authority guide, then use calculators below.
HVAC Sizing Guide
Industrial cooling load methodology, rules of thumb vs detailed methods, climate inputs, and verification—the canonical HVAC sizing reference on CalcPanel.
Beyond the core calculators, these topics cover sq ft sizing, climate bands, ventilation, duct diameter, and handoff to Power tools for electrical and energy impact.
Guides librarySizing methodology, load vs capacity, industrial design
Cooling size (area → tons → BTU/h)
Screen block cooling and heating load before Manual J or stamped engineering—one calculator, this hub. Sq ft rules and IECC zone factors live on the size calculator Formula section and FAQ.
HVAC size calculator — tons, BTU/h, and kW from area, height, occupancy, IECC zone
Scenario SERPs for warehouse AC shopping and data-center OEM pages are not Tier S landings here. Use these short cards to enter the calculator workflow—then size load, CFM, ducts, or CHW plant on the tools below.
Warehouse & high-bay HVAC planning
Description: Warehouse cooling is a facility planning problem (tons, high-bay ACH, duct/ESP)—not a window-unit shopping list. Start with block cooling load, convert the occupied height band to CFM, then screen trunks and fan ESP before vendor shortlists.
Typical load: Often 20–40+ BTU/h per sq ft for comfort cooling in occupied zones; process heat, dock doors, and clear height dominate peaks. Screen with the HVAC capacity calculator (warehouse example) and CFM / ACH using true clear height.
Recommended path: Capacity → ACH/CFM → duct size → static pressure. Portable “warehouse air conditioner” rental/shopping queries stay off this hub as product SERP.
Description: Data-center HVAC is thermal management (sensible IT load, humidity, redundancy)—OEM CRAC/CRAH pages own brand SERP. On CalcPanel, screen plant tons and air-state first, then electrical impact on the power hub.
Typical load: IT kW × ~3,412 BTU/h per kW plus UPS/PDU losses; latent is usually small vs comfort spaces. Use capacity for block tons, psychrometrics for dew-point/wet-bulb leaving-air checks, and chiller tonnage when CHW plants serve CRAH coils.
Intent split: The HVAC calculator (/tools/hvac-capacity) owns hvac calculator / tonnage / BTU sizing SERP. This hub (/hvac-calculator) is the planning index—use it for workflow navigation, then open the matching task tool above.
Generic “HVAC size calculator by zip code” queries route to the HVAC size calculator. Separate hvac duct size calculator intent uses the duct size tool—not as thin house/filter pages.
Square feet / system / unit size:HVAC size calculator — also covers calculate hvac size, hvac system size calculator, and hvac unit size calculator.
Zip code / climate: Pick your IECC climate zone on the size calculator—see the zone → factor table in that page’s Formula section.
HVAC kW feeds into facility demand and feeder sizing. Use the Power Calculator hub for factory load roll-up, transformer and generator context, and the Electrical hub for breaker and cable checks on HVAC feeders.
FAQ
What is an HVAC calculator used for?
This hub helps you pick the right free tool—cooling size (tons, BTU/h) or ventilation (CFM)—before detailed HVAC engineering. It does not replace Manual J or stamped loads for permit drawings.
Which HVAC calculator should I start with first?
For tonnage or BTU/h, start with the HVAC size calculator. For fan or duct airflow, start with ACH to CFM. Return to this hub when you need the full workflow.
Is there an HVAC size calculator by square feet?
Yes—use the HVAC size calculator with your floor area. The tool lists common BTU/h per square foot rules of thumb for US budgeting in its FAQ.
Can I size HVAC by zip code or climate zone?
Select your IECC climate zone on the HVAC size calculator. Zip-specific Manual J data still requires local design temperatures for permit drawings.
Where is the online ductulator or wet bulb calculator?
Ductulator / duct size:duct size calculator (CFM + velocity → round/rect; 12×12 CFM chart). Wet bulb:psychrometric calculator—same free page, no separate URL. Warehouse AC shopping queries stay on this hub summary only (no Tier S product page).
Do you have a warehouse air conditioner or data center HVAC page?
No Tier S shopping pages. Warehouse AC product SERPs and OEM data-center brands are absorbed as planning cards under HVAC applications—use capacity, CFM, duct/ESP, psychrometric, and chiller tools instead of portable-AC storefronts.
Do you have refrigerant charge or SEER savings calculators?
No dedicated tools—those SERPs are OEM line-charge apps and residential SEER shopping. For facility energy use, continue with the energy estimator; for capacity keep using HVAC size.
What is the difference between this hub and the HVAC size calculator?
This page (/hvac-calculator) is the HVAC calculators hub for navigation and workflow. The HVAC size calculator is the interactive tool for tons, BTU/h, and kW results—use it when your query is task-specific (size, capacity, sq ft).
How to calculate HVAC capacity for workshop retrofit?
