Available Tools
Duct Sizer
Size round and rectangular ducts by equal friction or velocity method. Darcy-Weisbach with Colebrook friction factor.
Airside
Duct Static Pressure
Build a critical air path with duct segments and equipment losses to calculate total external static pressure for fan selection.
Airside
Hydronic Pipe Sizer
Size hydronic piping for water and glycol systems by equal friction or velocity. Covers steel, copper, CPVC, and PEX.
Hydronics
Pipe Head Loss
Calculate total pump head for a hydronic circuit. Add pipe segments and equipment losses (coils, valves, strainers) to get system head in ft and psi.
Hydronics
Natural Gas Pipe Sizer
Capacity-based gas pipe sizing using the Spitzglass and Weymouth formulas. Supports natural gas and propane at low and medium pressure.
Gas Piping
Psychrometric Calculator
Moist air properties from dry bulb and one secondary condition — relative humidity, wet bulb, or dew point. Enthalpy, humidity ratio, specific volume, and more.
Psychrometrics
Fan Power Calculator
Calculate brake horsepower, select NEMA motor size, and estimate full load amps and annual energy from CFM and total static pressure.
Airside
Pump Selector
Size hydronic pumps from GPM and total dynamic head. Outputs water horsepower, brake horsepower, NEMA motor size, FLA, and annual energy.
Hydronics
Cooling Coil Calculator
Calculate sensible, latent, and total coil capacity from entering and leaving air conditions. Outputs tons, BTU/h, SHR, water removed, and face velocity.
Equipment
Refrigerant Pipe Sizer
Size suction, discharge, and liquid lines for DX systems. Supports R-410A, R-22, R-32, R-407C, and R-134a with velocity-based ACR copper sizing.
Refrigeration
Coming Soon
In Development
AIM Works Design Assistant
A full HVAC engineering design workflow tool — from thermal loads and ventilation through equipment selection, distribution sizing, controls, and compliance. Built for engineers who need depth, not just calculators.
ASHRAE 62.1 ventilation
CLTD / CLF / RTS load methods
Equipment selection & schedules
Pipe & duct network analysis
ASHRAE 90.1 compliance checks
PDF engineering reports