HVAC engineering, made clearer
Make the next HVAC decision with confidence.
A focused workspace for practical calculations, technical references, and the context needed to use them well.
Tool-first
Engineering context
Clear decisions
Start where the work starts
One hub. Four useful paths.
Each path connects practical work with supporting technical context.
A practical workflow
From question to informed next step.
- 01
Frame the input
Start with known conditions, units, and intended outcome.
- 02
Use the right tool
Apply a focused calculator or lookup to the specific task.
- 03
Check the context
Use references and guides to validate assumptions and constraints.
Latest updates
Recently strengthened tools
Listed by the latest maintained update date.
HVAC Load Calculator
Aggregate documented load components with validated inputs.
2026-11-03Refrigeration Capacity
Calculate documented mass-flow capacity with validated input ranges.
2026-11-03Refrigerant Superheat
Check matched temperatures without treating a blank as zero.
2026-11-03Refrigerant Subcooling
Calculate a signed temperature difference from complete measurements.
2026-10-28BTU Calculator
Convert thermal capacity with guarded numeric inputs.
2026-10-28BTU to Tons
Convert BTU/h to refrigeration tons with input validation.
2026-10-28Tons to BTU
Convert refrigeration tons without unsupported overflow results.
2026-10-28BTU per Square Foot
Compare stated capacity with served floor area.
2026-10-28Room BTU Calculator
Apply a documented planning rate with guarded inputs.
2026-10-15Equivalent Duct Diameter
Check the equal-friction result with aligned worked examples.
2026-10-15Equivalent Round Diameter Table
Look up formula-checked rectangular-to-round example values.
2026-10-15What Is CFM in HVAC?
Read the airflow definition, room-volume example, and measurement limits.
2026-10-09Duct Friction Loss
Check stated straight-run pressure loss with validated inputs.
2026-10-09Duct Size Calculator
Calculate preliminary round dimensions from airflow and velocity.
2026-10-09Rectangular Duct Size
Check width and height from a stated aspect ratio.
2026-10-09Duct Velocity
Check round and rectangular duct velocity from actual dimensions.
2026-09-30Air Changes per Hour
Check a stated airflow against room volume with guarded numeric inputs.
2026-09-30CFM per Square Foot
Normalize a known airflow by the area it serves.
2026-09-30CFM to Cubic Meters per Hour
Convert airflow units with invalid and overflow result clearing.
2026-09-30Cubic Meters per Hour to CFM
Convert metric volume flow to CFM with validated inputs.
2026-08-27Fume Hood Traverse
Summarize equal-area face-velocity measurements.
2026-08-27Fume Hood Exhaust Load
Estimate conditioned-exhaust thermal load from documented air states.
2026-08-27Fume Hood Airflow Verification
Keep measurement, containment, system flow, and load decisions separate.
2026-08-24Fan Law Calculator
Estimate same-system CFM, pressure, and brake-power changes from RPM.
2026-08-24Fan Pulley RPM
Calculate driven speed from motor RPM and sheave pitch diameters.
2026-08-24Fan Belt and Sheave Workflow
Connect speed ratio, belt geometry, and motor-load checks.
2026-08-08Heat Pump Operating Cost
Estimate electricity use and cost from a stated load and COP.
2026-08-08Heat Pump COP and Cost
Use point efficiency without confusing seasonal ratings.
2026-08-08Heat Pump Efficiency Ratings
Reference COP, EER, SEER2, and HSPF2.
2026-07-20Duct Friction Loss Calculator
Check transparent straight-duct friction inputs.
2026-07-20Duct Cross-Sectional Area
Calculate round or rectangular face area.
2026-07-20Duct Velocity Calculator
Check round and rectangular face velocity.
2026-07-20CFM Calculator
Convert room volume and a documented ACH basis to CFM.
Duct design
Duct design tools
Preliminary airflow, area, velocity, geometry, and friction checks.
Duct Size Calculator
Estimate a round duct diameter from CFM and velocity.
2026-07-20Rectangular Duct Size
Calculate preliminary width and height.
2026-07-20Equivalent Diameter
Compare rectangular and round equal-friction geometry.
2026-07-16How to Size HVAC Ductwork
Use airflow, area, velocity, and pressure checks together.
Load calculation
HVAC load planning
Documented component inputs and transparent preliminary results.
HVAC Load Calculator
Aggregate preliminary cooling and heating load components.
2026-07-16How to Calculate HVAC Load
Know what a detailed load method includes.
2026-07-16Manual J vs Rule of Thumb
Separate planning estimates from design procedures.
2026-07-16Load Calculation Review
Catch omitted inputs and unsupported sizing shortcuts.
Refrigeration
Measured refrigeration checks
Use documented state points and measured temperatures before making any equipment or service decision.
Heat pump efficiency
Load to operating cost
Use a known thermal load and matched point COP to understand electricity use and a narrow cost scenario.
Belt-drive fan service
From sheave ratio to fan performance
Check fan RPM, target driver size, belt geometry, and the power consequence of a speed change.
Laboratory fume hood workflow
From sash opening to exhaust load
Document measured velocity, equal-area distribution, active and standby airflow, and the thermal consequence without assigning an unsupported safety threshold.
Built for practical work
Explore the HVAC workspace.
Find tools, references, comparisons, and guides from one clear starting point.
