Unit Converter →
Convert common HVAC engineering units.
FREE ENGINEERING TOOLBOX
Start with the HVACR job you need to do.
You do not need to learn software menus first. Choose the field task, open the useful calculator or reference, and work with the engineering method in view. No login is required for the Free toolbox.
No login for Free tools20 practical tools & referencesMethod and applicability visible
WHAT ARE YOU TRYING TO DO?
Choose the job, not the software category.
These paths use plain field language so technicians, engineers, contractors, consultants and students can reach the right tool quickly.
START HEREI need to troubleshoot a fault1 tool · Show tools ↓START HEREI need airflow or ventilation help6 tools · Show tools ↓START HEREI need humidity or condensation checks4 tools · Show tools ↓START HEREI need water flow or cooling capacity3 tools · Show tools ↓START HEREI need a refrigeration field check4 tools · Show tools ↓START HEREI need a quick conversion or reference2 tools · Show tools ↓
YOUR SHORTCUTS
Continue where you left off.
Recent Tools and Favourites stay on this device, so repeat field work is faster without requiring an account.
QUICK ACCESS
Your everyday tools, one tap away.
Favourites and recent tools stay on this device. No sign-in is required.
Favourites
0Use the star on a tool to pin it here.
Recent tools
0Tools you open will appear here automatically.
KNOW WHAT YOU NEED?
Search the toolbox directly.
Search by task, quantity, equipment or engineering term. Examples: airflow, dew point, chilled water, superheat or unit conversion.
ALL FREE TOOLS
20 engineering tools and references
Every current tool remains available. The new task-first paths only improve discovery; they do not remove or hide the existing Free toolbox.
I need to troubleshoot a faultHVACR STUDIO
1 toolFind & Fix
Start with a symptom or problem and work through guided HVACR checks.
I need airflow or ventilation helpHVACR STUDIO
6 toolsAirside & Ventilation
Airflow, duct, ACH, fresh-air, AHU face-area and sensible-airflow checks.
Airflow
Open tool →Convert CFM, CMH, L/s and m³/s.
ACH
Open tool →Calculate air changes or required airflow.
Fresh Air
Open tool →Calculate outdoor airflow from project-specified people and area rates.
Duct Calculator
Open tool →Solve duct airflow, velocity or area.
AHU Face Area
Open tool →Calculate AHU gross face area or face velocity.
Sensible Heat
Open tool →Calculate airflow from sensible load and ΔT.
I need humidity or condensation checksHVACR STUDIO
4 toolsPsychrometrics & Moist Air
Humidity, dew point, condensation and cooling-coil state calculations.
Dew Point
Open tool →Calculate dew point from temperature and RH.
Condensation Risk
Open tool →Compare surface temperature with ambient-air dew point.
Psychrometric Calculator
Open tool →Calculate pressure-dependent moist-air properties.
Cooling Coil ADP / BF
Open tool →Calculate wet-coil apparatus dew point and bypass factor.
I need water flow or cooling capacityHVACR STUDIO
3 toolsHydronics & Capacity
Cooling capacity, chilled-water flow and hydronic pipe calculations.
I need a refrigeration field checkHVACR STUDIO
4 toolsRefrigeration
Efficiency, refrigerant properties, superheat/subcooling and refrigerant comparison.
EER / COP
Open tool →Convert COP, EER and kW per TR.
Refrigerant P-T
Open tool →Look up refrigerant saturation pressure or temperature.
Superheat / Subcooling Field Check
Open tool →Calculate blend-aware superheat and subcooling and compare with entered field targets.
Refrigerant Comparison
Open tool →Compare refrigerant family, safety class, GWP, composition and glide behavior.
I need a quick conversion or referenceHVACR STUDIO
2 toolsReference & Conversion
Fast unit conversion plus searchable HVACR formulas, constants and reminders.
TRANSPARENT ENGINEERING
Use the result with the method in view.
Where applicable, HVACR Studio tool pages include the formula or method, engineering assumptions and applicability notes so the calculation can be reviewed against actual project conditions. Basic Issue Finder similarly shows why each check matters and how to verify it safely.
Free means usefulEveryday calculations, references and guided troubleshooting remain practical without login.
Judgement stays with the engineerTools support checking and decision-making; they do not replace competent engineering judgement.
Specialist design stays separateDetailed room-wise heat load remains in Leal HLC; detailed AHU/GA automation remains in Leal GADraw.
FIND · CHECK · FIX · VERIFY
Start free. Move into Studio only when the work needs connected history and closure.
Basic Issue Finder and the engineering toolbox remain available without creating a Project.