This document describes a heat recovery unit with an enthalpy exchanger that allows for energy savings by recovering both sensible and latent heat from exhaust air. It uses a static heat exchanger made of paper sheets to transfer heat and humidity between incoming and outgoing air streams without condensation. Accessories include control panels for operation and sensors for temperature and humidity. The unit is compact, has automatic free cooling functions, low-energy brushless fans, and does not require draining of condensate.