Free, no-signup calculators and selectors for engineers and facility managers specifying air-to-air heat exchangers and waste-heat recovery.
Estimate annual energy, cost and CO₂ savings + payback from a heat recovery ventilator.
Open → SelectorAnswer 4 questions to get the right type: plate, rotary wheel, cross-flow or heat pipe.
Open → CalculatorDry-bulb + RH → dew point, wet-bulb, humidity ratio, enthalpy, specific volume.
Open → CalculatorFriction + fitting pressure drop for round or rectangular ducts — size your fan.
Open → CalculatorRecover dryer / oven exhaust heat to pre-heat make-up air; see the payback.
Open → ReferencePlate vs rotary vs cross-flow vs heat pipe — effectiveness, cost, best use.
Open →Engineers and buyers search for calculators and selectors by intent (“heat exchanger payback”, “duct friction loss”). These tools answer real questions, earn backlinks, and feed qualified enquiries to our team. Start with the Savings Calculator or the Selector.