All HVAC & Refrigeration Solvers
Complete collection of professional engineering calculators for HVAC design, refrigeration systems, and indoor air quality analysis. Each calculator includes step-by-step solutions with LaTeX-formatted mathematical expressions.
HVAC Load Calculator
Full Engineering Suite
Professional heating & cooling load calculation with interactive room designer, energy analysis, charts, and PDF reports — similar to Carrier HAP and Trace 3D
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Cooling Load Calculator
Manual J Method
Calculate sensible and latent cooling loads for residential and commercial buildings using industry-standard Manual J methodology
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Multi-Building Heat Load Dashboard
Portfolio Analysis
Calculate and compare cooling loads for multiple buildings simultaneously. Perfect for campus, commercial complex, and portfolio analysis
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Multi-Room Heat Load Calculator
Inter-Room Heat Transfer
Calculate cooling loads for multiple rooms/zones with heat transfer between rooms through walls, floors, and ceilings. Full building analysis
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Multi-Building Heating Load Dashboard
Portfolio Analysis
Calculate and compare heating loads for multiple buildings simultaneously. Perfect for campus, commercial complex, and portfolio analysis
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DIN EN 12831 Heating Load Dashboard
Multi-Room · Multi-Floor
Full DIN EN 12831 design heat load dashboard. Multi-room, multi-floor building with transmission f-factors, thermal bridges, ground & ventilation modelling, room orientation, and inter-room/inter-floor heat coupling (SI units)
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VDI 2078/6007 Cooling Load Dashboard
Multi-Room · Dynamic RC Simulation
Multi-room dynamic cooling load and room temperature dashboard using a detailed multi-node RC thermal network per VDI 2078/6007, simulated over a multi-day design period with per-room and building-level results
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Heating Load Estimator
Heat Loss Calculation
Estimate heating requirements based on building characteristics and outdoor design conditions
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Refrigeration COP Calculator
Coefficient of Performance
Calculate the efficiency of refrigeration cycles and heat pumps with Carnot cycle analysis
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Psychrometric Calculator
Air Properties
Calculate dry bulb, wet bulb, relative humidity, and other psychrometric properties of air
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Duct Sizing Calculator
ASHRAE Method
Size ductwork using equal friction or velocity methods per ASHRAE standards
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Fan CFM Calculator
Airflow Requirements
Calculate required fan capacity based on room volume and ventilation needs
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Chiller EER Calculator
Energy Efficiency Ratio
Calculate chiller plant efficiency and energy performance ratings
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Dehumidification Calculator
Moisture Removal Energy
Calculate energy required for dehumidification processes and moisture removal
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Air Changes Per Hour
ACH Solver
Calculate air change rates for proper ventilation and indoor air quality
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CO₂ Load Calculator
Indoor Air Quality
Calculate ventilation requirements based on CO₂ generation and occupancy
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Air Velocity Calculator
Duct Velocity
Calculate air velocity in ducts based on airflow and duct dimensions
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Static Pressure Calculator
Pressure Analysis
Calculate static pressure losses in ductwork including velocity pressure and friction losses
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BTU Calculator
Thermal Energy
Calculate BTU requirements for heating and cooling applications
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Tonnage Calculator
Cooling Capacity
Convert cooling loads to tonnage and determine system sizing requirements
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SEER Calculator
Energy Efficiency
Calculate SEER (Seasonal Energy Efficiency Ratio) and EER ratings for air conditioning systems
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HSPF Calculator
Heat Pump Efficiency
Calculate HSPF (Heating Seasonal Performance Factor) for heat pump systems
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Air Handler Sizing
AHU Sizing
Size air handling units based on cooling and heating loads
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Coil Sizing Calculator
Heat Transfer
Size heating and cooling coils based on load and airflow requirements
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Refrigerant Charge
Charge Calculation
Calculate required refrigerant charge based on pipe dimensions and refrigerant type
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Pipe Sizing Calculator
Flow Rate
Size pipes based on flow rate and velocity requirements for HVAC systems
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Pump Head Calculator
Hydraulic Head
Calculate total pump head including static, friction, and velocity components
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Pump Flow Calculator
Water Flow
Calculate required pump flow rate based on cooling load and temperature difference
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Heat Exchanger Calculator
LMTD Method
Calculate heat exchanger performance including LMTD, UA value, and effectiveness
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Boiler Efficiency
Steam Systems
Calculate boiler efficiency and heat losses for steam and hot water systems
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Combustion Efficiency
Flue Gas Analysis
Calculate combustion efficiency based on flue gas temperature and excess air
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Air Filter Efficiency
MERV Rating
Calculate air filter efficiency and MERV rating based on particle capture
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Pressure Drop Calculator
Duct & Pipe
Calculate pressure drop in ducts and pipes due to friction and velocity changes
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Friction Loss Calculator
Darcy-Weisbach
Calculate friction losses in ducts and pipes using Darcy-Weisbach equation
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Expansion Tank Calculator
Hydronic Systems
Calculate expansion tank size for hydronic heating and cooling systems
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Water Flow Calculator
Flow Rate
Calculate water flow rate required for cooling and heating systems
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Heat Recovery Calculator
Energy Recovery
Calculate heat recovery potential and energy savings from exhaust air
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Economizer Calculator
Free Cooling
Calculate energy savings from economizer operation using free cooling
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VAV Box Calculator
Variable Air Volume
Size and calculate VAV box requirements for variable air volume systems
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Damper Sizing Calculator
Air Control
Size dampers based on airflow and velocity requirements
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Grille Sizing Calculator
Air Distribution
Size air grilles based on airflow and velocity requirements
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Diffuser Sizing Calculator
Air Terminal
Size air diffusers based on airflow and throw requirements
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Louver Sizing Calculator
Outdoor Air
Size louvers for outdoor air intake and exhaust applications
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Sound Attenuation
Noise Control
Calculate sound attenuation and noise levels in HVAC systems
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Vibration Isolation
Equipment Isolation
Calculate vibration isolation requirements for HVAC equipment
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Thermal Expansion
Pipe & Duct
Calculate thermal expansion of pipes and ducts due to temperature changes
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Pipe Insulation Calculator
Heat Loss
Calculate heat loss from uninsulated and insulated pipes
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Duct Insulation Calculator
Duct Heat Loss
Calculate heat loss from uninsulated and insulated ducts
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Heat Loss Calculator
Building Envelope
Calculate heat loss through building envelope components
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Heat Gain Calculator
Cooling Load
Calculate heat gain through building envelope components
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Solar Heat Gain Calculator
Window Analysis
Calculate solar heat gain through windows and glazing
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Window Heat Gain Calculator
Complete Guide
Comprehensive window heat gain calculator including conductive, solar, and infiltration components with shading devices
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Infiltration Calculator
Air Leakage
Calculate infiltration loads and air leakage rates
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Ventilation Rate Calculator
ASHRAE 62.1
Calculate required ventilation rates per ASHRAE 62.1 standards
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Occupancy Load Calculator
People Load
Calculate sensible and latent loads from building occupants
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Lighting Load Calculator
Heat Gain
Calculate heat gain from lighting systems
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Equipment Load Calculator
Internal Load
Calculate heat gain from electrical equipment and appliances
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Zone Load Calculator
Space Load
Calculate zone-level loads and airflow requirements
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Part Load Ratio Calculator
PLR Analysis
Calculate part load ratio and efficiency for HVAC equipment
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Energy Consumption Calculator
Operating Cost
Calculate energy consumption and operating costs for HVAC equipment
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Operating Cost Calculator
Energy Cost
Calculate operating costs for HVAC systems based on power consumption and energy rates
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Payback Period Calculator
ROI Analysis
Calculate payback period and ROI for energy efficiency improvements
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Life Cycle Cost Calculator
LCC Analysis
Calculate total life cycle cost including initial, operating, and maintenance costs
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Carbon Footprint Calculator
Environmental Impact
Calculate carbon footprint and CO₂ emissions from HVAC energy consumption
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IAQ Index Calculator
Air Quality
Calculate Indoor Air Quality index based on multiple air quality parameters
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Thermal Comfort Calculator
ASHRAE 55
Calculate PMV and PPD indices for thermal comfort assessment per ASHRAE 55
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Building Energy Calculator
Energy Analysis
Calculate total building energy consumption and energy intensity
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Chilled Water Calculator
Water Flow
Calculate chilled water flow rate for cooling systems
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Condenser Water Calculator
Heat Rejection
Calculate condenser water flow rate for chiller systems
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Cooling Tower Calculator
Tower Performance
Calculate cooling tower performance including approach, range, and capacity
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Superheat & Subcooling Calculator
Refrigerant Charge
Calculate superheat and subcooling for refrigeration systems. Verify refrigerant charge and diagnose system performance
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Compressor Sizing Calculator
Refrigeration
Calculate compressor capacity and power requirements for refrigeration systems
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Control Valve Sizing Calculator
Hydronic Systems
Calculate control valve Cv and size for hydronic HVAC systems
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Air Throw Calculator
Air Distribution
Calculate air throw distance and velocity decay for diffusers and grilles
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Load Diversity Calculator
Multi-Zone Systems
Calculate diversified loads for multi-zone HVAC systems accounting for simultaneous operation
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Fan Affinity Laws Calculator
Fan Performance
Calculate fan performance at different speeds using fan affinity laws
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Humidification Load Calculator
Moisture Control
Calculate humidification requirements and moisture addition rates for HVAC systems
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Duct Leakage Calculator
Energy Efficiency
Calculate duct leakage rates and energy losses for HVAC ductwork systems
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Refrigerant Properties Calculator
Thermodynamics
Calculate thermodynamic properties of refrigerants including saturation pressure and temperature
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Evaporator Sizing Calculator
Refrigeration
Calculate evaporator coil size and area requirements for refrigeration systems
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Condenser Sizing Calculator
Heat Rejection
Calculate condenser coil size and area requirements for refrigeration systems
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Refrigeration Cycle Analysis
Thermodynamics
Analyze refrigeration cycles including COP, Carnot efficiency, and compressor work
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PID Tuning Calculator
Control Systems
Calculate PID controller tuning parameters for HVAC control loops
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Actuator Sizing Calculator
Control Systems
Calculate actuator torque requirements for damper and valve control
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Air Mixing Calculator
Air Distribution
Calculate mixed air temperature and airflow when combining supply and return air streams
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Air Balancing Calculator
TAB
Calculate air balancing adjustments and ratios for Testing, Adjusting, and Balancing
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System Efficiency Calculator
Performance
Calculate overall HVAC system efficiency including EER, COP, and total power
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Pump Curve Calculator
Hydronic Systems
Calculate pump performance parameters including power and specific speed
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Building Energy Rating Calculator
Energy Analysis
Calculate building energy rating and energy intensity for performance assessment
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Water Treatment Calculator
Cooling Tower
Calculate chemical dosing requirements for cooling tower water treatment
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Geothermal Sizing Calculator
Ground Source
Calculate geothermal ground loop sizing for ground-source heat pump systems
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Smoke Control Calculator
Fire Safety
Calculate smoke control system airflow requirements for building fire safety
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Water Hammer Calculator
Hydronic Systems
Calculate water hammer surge pressure in hydronic piping systems
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Glycol Concentration Calculator
Freeze Protection
Calculate glycol concentration requirements for freeze protection in hydronic systems
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Equipment Life Expectancy Calculator
Maintenance
Calculate expected equipment life and remaining useful life for HVAC equipment
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Maintenance Cost Calculator
Maintenance
Calculate preventive maintenance costs for HVAC equipment over lifetime
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System Balancing Calculator
TAB
Calculate system balancing requirements and adjustments for HVAC systems
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Code Compliance Calculator
Building Codes
Check HVAC system compliance with building energy codes including ASHRAE 90.1
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Solar HVAC Calculator
Renewable Energy
Calculate solar panel requirements for solar-assisted HVAC systems
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Why Choose Our Engineering Calculators?
Industry Standards
All calculations follow ASHRAE, Manual J, and other recognized industry standards for accuracy and reliability
Step-by-Step Solutions
Detailed calculation breakdowns with LaTeX-formatted formulas for educational value and verification
Unit Flexibility
Switch seamlessly between Imperial and SI units for global engineering compatibility and convenience