HVAC calculators

Enter measured entering and leaving air conditions, airflow, altitude, runtime, and collection losses. The calculator estimates condensate flow, daily production, seasonal water, recoverable water, and a design drain allowance.

Enter tower flow, hot and cold water temperatures, drift, cycles of concentration, and operating hours. The calculator estimates current and proposed makeup water, blowdown, annual savings, and the conductivity setpoint for the proposed cycles.

Enter duct temperature, attic or crawlspace air conditions, duct size, and insulation properties. The calculator checks the installed jacket temperature against dew point and estimates the insulation thickness needed for condensation control.

Enter a duct size, run length, airflow, temperatures, and installed R-value to estimate the leaving air temperature and heat transfer. The tool also solves backward for the R-value needed to hold the change under your target.

Enter outdoor conditions, elevation, and cooler performance to estimate the supply air your direct evaporative cooler can deliver. The result also shows its evaporation rate, sensible capacity, and the airflow needed for an entered sensible load.

Enter the short-cycle capacity, smallest active load, desired run time, usable temperature swing, and participating water volume. The calculator estimates the nominal buffer tank size and checks whether a candidate tank meets the runtime and minimum-volume requirements.

Use the blower pressure, pressure losses, and longest supply and return paths to calculate the duct friction rate used in a Manual D design. The reverse check shows how much total effective length the pressure budget can support at a proposed rate.

Enter the airflow and measured condition of outdoor and return air to estimate the mixed-air state at an air handler. The calculation weights each stream by dry-air mass, so it accounts for temperature, humidity, density, and site altitude.

Compare a baseline air conditioner with a higher-efficiency quote using the cooling cost you already know. The calculator estimates first-year savings, payback with electricity-price growth, discounted payback, and net present value.

Enter the tested duct surface area, test pressure, measured leakage, and specified leakage class. The calculator reports the achieved class, allowable leakage, pass margin, pressure-normalized airflow, and leakage as a share of design airflow.